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2013
Fukuyama Hidehiro, Verdier Yann, Guan Yongsheng, Makino-Okamura Chieko, Shilova Victoria, Liu Xi, Maksoud Elie, Matsubayashi Jun, Haddad Iman, Spirohn Kerstin, Ono Kenichiro, Hetru Charles, Rossier Jean, Ideker Trey, Boutros Michael, Vinh Joëlle, Hoffmann Jules A
Landscape of protein-protein interactions in Drosophila immune deficiency signaling during bacterial challenge Article de journal
Dans: Proc. Natl. Acad. Sci. U.S.A., vol. 110, no. 26, p. 10717–10722, 2013, ISSN: 1091-6490.
Résumé | Liens | BibTeX | Étiquettes: Amino Acid, Animals, Chromatin Assembly and Disassembly, Escherichia coli, functional proteomics, Genes, Genetically Modified, Histone Acetyltransferases, hoffmann, Host-Pathogen Interactions, Humans, IMD interactome, Insect, M3i, Models, Molecular, Protein Interaction Maps, Sequence Homology, Signal Transduction, small ubiquitin-like modifier
@article{fukuyama_landscape_2013,
title = {Landscape of protein-protein interactions in Drosophila immune deficiency signaling during bacterial challenge},
author = {Hidehiro Fukuyama and Yann Verdier and Yongsheng Guan and Chieko Makino-Okamura and Victoria Shilova and Xi Liu and Elie Maksoud and Jun Matsubayashi and Iman Haddad and Kerstin Spirohn and Kenichiro Ono and Charles Hetru and Jean Rossier and Trey Ideker and Michael Boutros and Joëlle Vinh and Jules A Hoffmann},
doi = {10.1073/pnas.1304380110},
issn = {1091-6490},
year = {2013},
date = {2013-06-01},
journal = {Proc. Natl. Acad. Sci. U.S.A.},
volume = {110},
number = {26},
pages = {10717--10722},
abstract = {The Drosophila defense against pathogens largely relies on the activation of two signaling pathways: immune deficiency (IMD) and Toll. The IMD pathway is triggered mainly by Gram-negative bacteria, whereas the Toll pathway responds predominantly to Gram-positive bacteria and fungi. The activation of these pathways leads to the rapid induction of numerous NF-κB-induced immune response genes, including antimicrobial peptide genes. The IMD pathway shows significant similarities with the TNF receptor pathway. Recent evidence indicates that the IMD pathway is also activated in response to various noninfectious stimuli (i.e., inflammatory-like reactions). To gain a better understanding of the molecular machinery underlying the pleiotropic functions of this pathway, we first performed a comprehensive proteomics analysis to identify the proteins interacting with the 11 canonical members of the pathway initially identified by genetic studies. We identified 369 interacting proteins (corresponding to 291 genes) in heat-killed Escherichia coli-stimulated Drosophila S2 cells, 92% of which have human orthologs. A comparative analysis of gene ontology from fly or human gene annotation databases points to four significant common categories: (i) the NuA4, nucleosome acetyltransferase of H4, histone acetyltransferase complex, (ii) the switching defective/sucrose nonfermenting-type chromatin remodeling complex, (iii) transcription coactivator activity, and (iv) translation factor activity. Here we demonstrate that sumoylation of the IκB kinase homolog immune response-deficient 5 plays an important role in the induction of antimicrobial peptide genes through a highly conserved sumoylation consensus site during bacterial challenge. Taken together, the proteomics data presented here provide a unique avenue for a comparative functional analysis of proteins involved in innate immune reactions in flies and mammals.},
keywords = {Amino Acid, Animals, Chromatin Assembly and Disassembly, Escherichia coli, functional proteomics, Genes, Genetically Modified, Histone Acetyltransferases, hoffmann, Host-Pathogen Interactions, Humans, IMD interactome, Insect, M3i, Models, Molecular, Protein Interaction Maps, Sequence Homology, Signal Transduction, small ubiquitin-like modifier},
pubstate = {published},
tppubtype = {article}
}
The Drosophila defense against pathogens largely relies on the activation of two signaling pathways: immune deficiency (IMD) and Toll. The IMD pathway is triggered mainly by Gram-negative bacteria, whereas the Toll pathway responds predominantly to Gram-positive bacteria and fungi. The activation of these pathways leads to the rapid induction of numerous NF-κB-induced immune response genes, including antimicrobial peptide genes. The IMD pathway shows significant similarities with the TNF receptor pathway. Recent evidence indicates that the IMD pathway is also activated in response to various noninfectious stimuli (i.e., inflammatory-like reactions). To gain a better understanding of the molecular machinery underlying the pleiotropic functions of this pathway, we first performed a comprehensive proteomics analysis to identify the proteins interacting with the 11 canonical members of the pathway initially identified by genetic studies. We identified 369 interacting proteins (corresponding to 291 genes) in heat-killed Escherichia coli-stimulated Drosophila S2 cells, 92% of which have human orthologs. A comparative analysis of gene ontology from fly or human gene annotation databases points to four significant common categories: (i) the NuA4, nucleosome acetyltransferase of H4, histone acetyltransferase complex, (ii) the switching defective/sucrose nonfermenting-type chromatin remodeling complex, (iii) transcription coactivator activity, and (iv) translation factor activity. Here we demonstrate that sumoylation of the IκB kinase homolog immune response-deficient 5 plays an important role in the induction of antimicrobial peptide genes through a highly conserved sumoylation consensus site during bacterial challenge. Taken together, the proteomics data presented here provide a unique avenue for a comparative functional analysis of proteins involved in innate immune reactions in flies and mammals.
2011
Limmer Stefanie, Haller Samantha, Drenkard Eliana, Lee Janice, Yu Shen, Kocks Christine, Ausubel Frederick M, Ferrandon Dominique
Pseudomonas aeruginosa RhlR is required to neutralize the cellular immune response in a Drosophila melanogaster oral infection model Article de journal
Dans: Proc. Natl. Acad. Sci. U.S.A., vol. 108, no. 42, p. 17378–17383, 2011, ISSN: 1091-6490.
Résumé | Liens | BibTeX | Étiquettes: Animal, Animals, Bacteremia, Bacterial Proteins, Cellular, Disease Models, ferrandon, Genes, Genetically Modified, Hemolymph, Host-Pathogen Interactions, Immunity, Insect, M3i, Mutation, Oral, Pseudomonas aeruginosa, Pseudomonas Infections, Quorum Sensing, Trans-Activators, Viral, Virulence
@article{limmer_pseudomonas_2011b,
title = {Pseudomonas aeruginosa RhlR is required to neutralize the cellular immune response in a Drosophila melanogaster oral infection model},
author = {Stefanie Limmer and Samantha Haller and Eliana Drenkard and Janice Lee and Shen Yu and Christine Kocks and Frederick M Ausubel and Dominique Ferrandon},
doi = {10.1073/pnas.1114907108},
issn = {1091-6490},
year = {2011},
date = {2011-10-01},
journal = {Proc. Natl. Acad. Sci. U.S.A.},
volume = {108},
number = {42},
pages = {17378--17383},
abstract = {An in-depth mechanistic understanding of microbial infection necessitates a molecular dissection of host-pathogen relationships. Both Drosophila melanogaster and Pseudomonas aeruginosa have been intensively studied. Here, we analyze the infection of D. melanogaster by P. aeruginosa by using mutants in both host and pathogen. We show that orally ingested P. aeruginosa crosses the intestinal barrier and then proliferates in the hemolymph, thereby causing the infected flies to die of bacteremia. Host defenses against ingested P. aeruginosa included an immune deficiency (IMD) response in the intestinal epithelium, systemic Toll and IMD pathway responses, and a cellular immune response controlling bacteria in the hemocoel. Although the observed cellular and intestinal immune responses appeared to act throughout the course of the infection, there was a late onset of the systemic IMD and Toll responses. In this oral infection model, P. aeruginosa PA14 did not require its type III secretion system or other well-studied virulence factors such as the two-component response regulator GacA or the protease AprA for virulence. In contrast, the quorum-sensing transcription factor RhlR, but surprisingly not LasR, played a key role in counteracting the cellular immune response against PA14, possibly at an early stage when only a few bacteria are present in the hemocoel. These results illustrate the power of studying infection from the dual perspective of host and pathogen by revealing that RhlR plays a more complex role during pathogenesis than previously appreciated.},
keywords = {Animal, Animals, Bacteremia, Bacterial Proteins, Cellular, Disease Models, ferrandon, Genes, Genetically Modified, Hemolymph, Host-Pathogen Interactions, Immunity, Insect, M3i, Mutation, Oral, Pseudomonas aeruginosa, Pseudomonas Infections, Quorum Sensing, Trans-Activators, Viral, Virulence},
pubstate = {published},
tppubtype = {article}
}
An in-depth mechanistic understanding of microbial infection necessitates a molecular dissection of host-pathogen relationships. Both Drosophila melanogaster and Pseudomonas aeruginosa have been intensively studied. Here, we analyze the infection of D. melanogaster by P. aeruginosa by using mutants in both host and pathogen. We show that orally ingested P. aeruginosa crosses the intestinal barrier and then proliferates in the hemolymph, thereby causing the infected flies to die of bacteremia. Host defenses against ingested P. aeruginosa included an immune deficiency (IMD) response in the intestinal epithelium, systemic Toll and IMD pathway responses, and a cellular immune response controlling bacteria in the hemocoel. Although the observed cellular and intestinal immune responses appeared to act throughout the course of the infection, there was a late onset of the systemic IMD and Toll responses. In this oral infection model, P. aeruginosa PA14 did not require its type III secretion system or other well-studied virulence factors such as the two-component response regulator GacA or the protease AprA for virulence. In contrast, the quorum-sensing transcription factor RhlR, but surprisingly not LasR, played a key role in counteracting the cellular immune response against PA14, possibly at an early stage when only a few bacteria are present in the hemocoel. These results illustrate the power of studying infection from the dual perspective of host and pathogen by revealing that RhlR plays a more complex role during pathogenesis than previously appreciated.
2007
Mandin P., Repoila F., Vergassola M., Geissmann T., Cossart P.
Identification of new noncoding RNAs in Listeria monocytogenes and prediction of mRNA targets Article de journal
Dans: Nucleic Acids Res, vol. 35, no. 3, p. 962-74, 2007, (1362-4962 (Electronic) Journal Article Research Support, Non-U.S. Gov't).
Résumé | BibTeX | Étiquettes: 5', Assay, Bacterial, Base, Biology, Computational, Data, DNA, Electrophoretic, Flanking, Genes, Genomics, Intergenic/chemistry, Listeria, Messenger/chemistry/*metabolism, Mobility, Molecular, monocytogenes/*genetics/metabolism, Region, RNA, ROMBY, Sequence, Shift, Untranslated/analysis/*genetics/metabolism
@article{,
title = {Identification of new noncoding RNAs in Listeria monocytogenes and prediction of mRNA targets},
author = { P. Mandin and F. Repoila and M. Vergassola and T. Geissmann and P. Cossart},
year = {2007},
date = {2007-01-01},
journal = {Nucleic Acids Res},
volume = {35},
number = {3},
pages = {962-74},
abstract = {To identify noncoding RNAs (ncRNAs) in the pathogenic bacterium Listeria monocytogenes, we analyzed the intergenic regions (IGRs) of strain EGD-e by in silico-based approaches. Among the twelve ncRNAs found, nine are novel and specific to the Listeria genus, and two of these ncRNAs are expressed in a growth-dependent manner. Three of the ncRNAs are transcribed in opposite direction to overlapping open reading frames (ORFs), suggesting that they act as antisense on the corresponding mRNAs. The other ncRNA genes appear as single transcription units. One of them displays five repeats of 29 nucleotides. Five of these new ncRNAs are absent from the non-pathogenic species L. innocua, raising the possibility that they might be involved in virulence. To predict mRNA targets of the ncRNAs, we developed a computational method based on thermodynamic pairing energies and known ncRNA-mRNA hybrids. Three ncRNAs, including one of the putative antisense ncRNAs, were predicted to have more than one mRNA targets. Several of them were shown to bind efficiently to the ncRNAs suggesting that our in silico approach could be used as a general tool to search for mRNA targets of ncRNAs.},
note = {1362-4962 (Electronic)
Journal Article
Research Support, Non-U.S. Gov't},
keywords = {5', Assay, Bacterial, Base, Biology, Computational, Data, DNA, Electrophoretic, Flanking, Genes, Genomics, Intergenic/chemistry, Listeria, Messenger/chemistry/*metabolism, Mobility, Molecular, monocytogenes/*genetics/metabolism, Region, RNA, ROMBY, Sequence, Shift, Untranslated/analysis/*genetics/metabolism},
pubstate = {published},
tppubtype = {article}
}
To identify noncoding RNAs (ncRNAs) in the pathogenic bacterium Listeria monocytogenes, we analyzed the intergenic regions (IGRs) of strain EGD-e by in silico-based approaches. Among the twelve ncRNAs found, nine are novel and specific to the Listeria genus, and two of these ncRNAs are expressed in a growth-dependent manner. Three of the ncRNAs are transcribed in opposite direction to overlapping open reading frames (ORFs), suggesting that they act as antisense on the corresponding mRNAs. The other ncRNA genes appear as single transcription units. One of them displays five repeats of 29 nucleotides. Five of these new ncRNAs are absent from the non-pathogenic species L. innocua, raising the possibility that they might be involved in virulence. To predict mRNA targets of the ncRNAs, we developed a computational method based on thermodynamic pairing energies and known ncRNA-mRNA hybrids. Three ncRNAs, including one of the putative antisense ncRNAs, were predicted to have more than one mRNA targets. Several of them were shown to bind efficiently to the ncRNAs suggesting that our in silico approach could be used as a general tool to search for mRNA targets of ncRNAs.
2006
Frolet Cécile, Thoma Martine, Blandin Stéphanie A, Hoffmann Jules A, Levashina Elena A
Boosting NF-kappaB-dependent basal immunity of Anopheles gambiae aborts development of Plasmodium berghei Article de journal
Dans: Immunity, vol. 25, no. 4, p. 677–685, 2006, ISSN: 1074-7613.
Résumé | Liens | BibTeX | Étiquettes: Animals, Anopheles gambiae, blandin, Gene Expression, Gene Expression Regulation, Genes, hoffmann, Immunity, Insect, M3i, NF-kappa B, Plasmodium berghei, telomerase
@article{frolet_boosting_2006,
title = {Boosting NF-kappaB-dependent basal immunity of Anopheles gambiae aborts development of Plasmodium berghei},
author = {Cécile Frolet and Martine Thoma and Stéphanie A Blandin and Jules A Hoffmann and Elena A Levashina},
url = {http://www.ncbi.nlm.nih.gov/pubmed/17045818},
doi = {10.1016/j.immuni.2006.08.019},
issn = {1074-7613},
year = {2006},
date = {2006-10-01},
journal = {Immunity},
volume = {25},
number = {4},
pages = {677--685},
abstract = {Anopheles gambiae, the major vector for the protozoan malaria parasite Plasmodium falciparum, mounts powerful antiparasitic responses that cause marked parasite loss during midgut invasion. Here, we showed that these antiparasitic defenses were composed of pre- and postinvasion phases and that the preinvasion phase was predominantly regulated by Rel1 and Rel2 members of the NF-kappaB transcription factors. Concurrent silencing of Rel1 and Rel2 decreased the basal expression of the major antiparasitic genes TEP1 and LRIM1 and abolished resistance of Anopheles to the rodent malaria parasite P. berghei. Conversely, depletion of a negative regulator of Rel1, Cactus, prior to infection, enhanced the basal expression of TEP1 and of other immune factors and completely prevented parasite development. Our findings uncover the crucial role of the preinvasion defense in the elimination of parasites, which is at least in part based on circulating blood molecules.},
keywords = {Animals, Anopheles gambiae, blandin, Gene Expression, Gene Expression Regulation, Genes, hoffmann, Immunity, Insect, M3i, NF-kappa B, Plasmodium berghei, telomerase},
pubstate = {published},
tppubtype = {article}
}
Anopheles gambiae, the major vector for the protozoan malaria parasite Plasmodium falciparum, mounts powerful antiparasitic responses that cause marked parasite loss during midgut invasion. Here, we showed that these antiparasitic defenses were composed of pre- and postinvasion phases and that the preinvasion phase was predominantly regulated by Rel1 and Rel2 members of the NF-kappaB transcription factors. Concurrent silencing of Rel1 and Rel2 decreased the basal expression of the major antiparasitic genes TEP1 and LRIM1 and abolished resistance of Anopheles to the rodent malaria parasite P. berghei. Conversely, depletion of a negative regulator of Rel1, Cactus, prior to infection, enhanced the basal expression of TEP1 and of other immune factors and completely prevented parasite development. Our findings uncover the crucial role of the preinvasion defense in the elimination of parasites, which is at least in part based on circulating blood molecules.
Durand Stéphanie H, Flacher Vincent, Roméas Annick, Carrouel Florence, Colomb Evelyne, Vincent Claude, Magloire Henry, Couble Marie-Lise, Bleicher Françoise, Staquet Marie-Jeanne, Lebecque Serge, Farges Jean-Christophe
Lipoteichoic acid increases TLR and functional chemokine expression while reducing dentin formation in in vitro differentiated human odontoblasts Article de journal
Dans: Journal of Immunology (Baltimore, Md.: 1950), vol. 176, no. 5, p. 2880–2887, 2006, ISSN: 0022-1767.
Résumé | Liens | BibTeX | Étiquettes: Activation, Analysis, bacteria, Biosynthesis, BLOOD, Blood Vessels, Cell Differentiation, Cells, Chemistry, chemokines, COLLAGEN, Cultured, CXCL10, cytology, Dendritic Cells, DENTAL PULP, Dentin, development, Down-Regulation, Expression, extracellular, EXTRACELLULAR MATRIX, Extracellular Matrix Proteins, function, Gene, Gene Expression, Genes, Genetics, Gram-Positive Bacteria, Human, Humans, IMMATURE, Immunology, IN VITRO, In vivo, Innate immune response, lipopolysaccharide, Lipopolysaccharides, metabolism, migration, Odontoblasts, Organ Culture Techniques, Pharmacology, physiology, PRODUCTION, Protein, Proteins, Receptor, recognition, synthesis, Team-Mueller, Teichoic Acids, TLR7, Toll-Like Receptor 2, Up-Regulation
@article{durand_lipoteichoic_2006,
title = {Lipoteichoic acid increases TLR and functional chemokine expression while reducing dentin formation in in vitro differentiated human odontoblasts},
author = {Stéphanie H Durand and Vincent Flacher and Annick Roméas and Florence Carrouel and Evelyne Colomb and Claude Vincent and Henry Magloire and Marie-Lise Couble and Françoise Bleicher and Marie-Jeanne Staquet and Serge Lebecque and Jean-Christophe Farges},
doi = {10.4049/jimmunol.176.5.2880},
issn = {0022-1767},
year = {2006},
date = {2006-03-01},
journal = {Journal of Immunology (Baltimore, Md.: 1950)},
volume = {176},
number = {5},
pages = {2880--2887},
abstract = {Gram-positive bacteria entering the dentinal tissue during the carious process are suspected to influence the immune response in human dental pulp. Odontoblasts situated at the pulp/dentin interface are the first cells encountered by these bacteria and therefore could play a crucial role in this response. In the present study, we found that in vitro-differentiated odontoblasts constitutively expressed the pattern recognition receptor TLR1-6 and 9 genes but not TLR7, 8, and 10. Furthermore, lipoteichoic acid (LTA), a wall component of Gram-positive bacteria, triggered the activation of the odontoblasts. LTA up-regulated the expression of its own receptor TLR2, as well as the production of several chemokines. In particular, an increased amount of CCL2 and CXCL10 was detected in supernatants from LTA-stimulated odontoblasts, and those supernatants augmented the migration of immature dendritic cells in vitro compared with controls. Clinical relevance of these observations came from immunohistochemical analysis showing that CCL2 was expressed in vivo by odontoblasts and blood vessels present under active carious lesions but not in healthy dental pulps. In contrast with this inflammatory response, gene expression of major dentin matrix components (type I collagen, dentin sialophosphoprotein) and TGF-beta1 was sharply down-regulated in odontoblasts by LTA. Taken together, these data suggest that odontoblasts activated through TLR2 by Gram-positive bacteria LTA are able to initiate an innate immune response by secreting chemokines that recruit immature dendritic cells while down-regulating their specialized functions of dentin matrix synthesis and mineralization.},
keywords = {Activation, Analysis, bacteria, Biosynthesis, BLOOD, Blood Vessels, Cell Differentiation, Cells, Chemistry, chemokines, COLLAGEN, Cultured, CXCL10, cytology, Dendritic Cells, DENTAL PULP, Dentin, development, Down-Regulation, Expression, extracellular, EXTRACELLULAR MATRIX, Extracellular Matrix Proteins, function, Gene, Gene Expression, Genes, Genetics, Gram-Positive Bacteria, Human, Humans, IMMATURE, Immunology, IN VITRO, In vivo, Innate immune response, lipopolysaccharide, Lipopolysaccharides, metabolism, migration, Odontoblasts, Organ Culture Techniques, Pharmacology, physiology, PRODUCTION, Protein, Proteins, Receptor, recognition, synthesis, Team-Mueller, Teichoic Acids, TLR7, Toll-Like Receptor 2, Up-Regulation},
pubstate = {published},
tppubtype = {article}
}
Gram-positive bacteria entering the dentinal tissue during the carious process are suspected to influence the immune response in human dental pulp. Odontoblasts situated at the pulp/dentin interface are the first cells encountered by these bacteria and therefore could play a crucial role in this response. In the present study, we found that in vitro-differentiated odontoblasts constitutively expressed the pattern recognition receptor TLR1-6 and 9 genes but not TLR7, 8, and 10. Furthermore, lipoteichoic acid (LTA), a wall component of Gram-positive bacteria, triggered the activation of the odontoblasts. LTA up-regulated the expression of its own receptor TLR2, as well as the production of several chemokines. In particular, an increased amount of CCL2 and CXCL10 was detected in supernatants from LTA-stimulated odontoblasts, and those supernatants augmented the migration of immature dendritic cells in vitro compared with controls. Clinical relevance of these observations came from immunohistochemical analysis showing that CCL2 was expressed in vivo by odontoblasts and blood vessels present under active carious lesions but not in healthy dental pulps. In contrast with this inflammatory response, gene expression of major dentin matrix components (type I collagen, dentin sialophosphoprotein) and TGF-beta1 was sharply down-regulated in odontoblasts by LTA. Taken together, these data suggest that odontoblasts activated through TLR2 by Gram-positive bacteria LTA are able to initiate an innate immune response by secreting chemokines that recruit immature dendritic cells while down-regulating their specialized functions of dentin matrix synthesis and mineralization.
2005
Kocks Christine, Cho Ju Hyun, Nehme Nadine, Ulvila Johanna, Pearson Alan M, Meister Marie, Strom Charles, Conto Stephanie L, Hetru Charles, Stuart Lynda M, Stehle Thilo, Hoffmann Jules A, Reichhart Jean-Marc, Ferrandon Dominique, Rämet Mika, Ezekowitz Alan R B
Eater, a transmembrane protein mediating phagocytosis of bacterial pathogens in Drosophila Article de journal
Dans: Cell, vol. 123, no. 2, p. 335–346, 2005, ISSN: 0092-8674.
Résumé | Liens | BibTeX | Étiquettes: Amino Acid, Amino Acid Motifs, Animals, Bacterial Infections, Cell Surface, Embryo, Escherichia coli, ferrandon, Flow Cytometry, Frameshift Mutation, Genes, Histidine, hoffmann, In Situ Hybridization, Insect, Insect Proteins, M3i, Macrophages, Membrane Proteins, messenger, Nonmammalian, Open Reading Frames, Phagocytosis, Receptors, reichhart, RNA, RNA Interference, Sequence Homology, Serratia marcescens
@article{kocks_eater_2005,
title = {Eater, a transmembrane protein mediating phagocytosis of bacterial pathogens in Drosophila},
author = {Christine Kocks and Ju Hyun Cho and Nadine Nehme and Johanna Ulvila and Alan M Pearson and Marie Meister and Charles Strom and Stephanie L Conto and Charles Hetru and Lynda M Stuart and Thilo Stehle and Jules A Hoffmann and Jean-Marc Reichhart and Dominique Ferrandon and Mika Rämet and Alan R B Ezekowitz},
doi = {10.1016/j.cell.2005.08.034},
issn = {0092-8674},
year = {2005},
date = {2005-10-01},
journal = {Cell},
volume = {123},
number = {2},
pages = {335--346},
abstract = {Phagocytosis is a complex, evolutionarily conserved process that plays a central role in host defense against infection. We have identified a predicted transmembrane protein, Eater, which is involved in phagocytosis in Drosophila. Transcriptional silencing of the eater gene in a macrophage cell line led to a significant reduction in the binding and internalization of bacteria. Moreover, the N terminus of the Eater protein mediated direct microbial binding which could be inhibited with scavenger receptor ligands, acetylated, and oxidized low-density lipoprotein. In vivo, eater expression was restricted to blood cells. Flies lacking the eater gene displayed normal responses in NF-kappaB-like Toll and IMD signaling pathways but showed impaired phagocytosis and decreased survival after bacterial infection. Our results suggest that Eater is a major phagocytic receptor for a broad range of bacterial pathogens in Drosophila and provide a powerful model to address the role of phagocytosis in vivo.},
keywords = {Amino Acid, Amino Acid Motifs, Animals, Bacterial Infections, Cell Surface, Embryo, Escherichia coli, ferrandon, Flow Cytometry, Frameshift Mutation, Genes, Histidine, hoffmann, In Situ Hybridization, Insect, Insect Proteins, M3i, Macrophages, Membrane Proteins, messenger, Nonmammalian, Open Reading Frames, Phagocytosis, Receptors, reichhart, RNA, RNA Interference, Sequence Homology, Serratia marcescens},
pubstate = {published},
tppubtype = {article}
}
Phagocytosis is a complex, evolutionarily conserved process that plays a central role in host defense against infection. We have identified a predicted transmembrane protein, Eater, which is involved in phagocytosis in Drosophila. Transcriptional silencing of the eater gene in a macrophage cell line led to a significant reduction in the binding and internalization of bacteria. Moreover, the N terminus of the Eater protein mediated direct microbial binding which could be inhibited with scavenger receptor ligands, acetylated, and oxidized low-density lipoprotein. In vivo, eater expression was restricted to blood cells. Flies lacking the eater gene displayed normal responses in NF-kappaB-like Toll and IMD signaling pathways but showed impaired phagocytosis and decreased survival after bacterial infection. Our results suggest that Eater is a major phagocytic receptor for a broad range of bacterial pathogens in Drosophila and provide a powerful model to address the role of phagocytosis in vivo.
Fauny Jean Daniel, Silber Joël, Zider Alain
Drosophila Lipid Storage Droplet 2 gene (Lsd-2) is expressed and controls lipid storage in wing imaginal discs Article de journal
Dans: Developmental Dynamics: An Official Publication of the American Association of Anatomists, vol. 232, no. 3, p. 725–732, 2005, ISSN: 1058-8388.
Résumé | Liens | BibTeX | Étiquettes: Animals, Biological, Drosophila, Drosophila Proteins, Embryo, Fat Body, Genes, I2CT, Imagerie, Insect, Larva, Lipid Metabolism, Metamorphosis, Mutation, Nonmammalian, Nuclear Proteins, Phosphoproteins, Wing
@article{fauny_drosophila_2005,
title = {Drosophila Lipid Storage Droplet 2 gene (Lsd-2) is expressed and controls lipid storage in wing imaginal discs},
author = {Jean Daniel Fauny and Joël Silber and Alain Zider},
url = {http://www.ncbi.nlm.nih.gov/pubmed/15704138},
doi = {10.1002/dvdy.20277},
issn = {1058-8388},
year = {2005},
date = {2005-03-01},
urldate = {2011-10-24},
journal = {Developmental Dynamics: An Official Publication of the American Association of Anatomists},
volume = {232},
number = {3},
pages = {725--732},
abstract = {Lipid droplets are the major neutral lipid storage organelles in higher eukaryotes. The PAT domain proteins (Perilipin, ADRP [adipose differentiation related protein], and TIP47 [tail-interacting 47-kDa protein]) are associated with these structures. Perilipin and ADRP are involved in the regulation of lipid storage and metabolism in mammals. Two genes encoding PAT proteins, Drosophila Lipid Storage Droplet 2 Gene (Lsd-2) and Lsd-2, have been identified in Drosophila. Lsd-2 is expressed in fat bodies and in the female germ line and is involved in lipid storage in these tissues. We showed that Lsd-2 is expressed in third-instar wing imaginal discs in Drosophila, with higher levels in the wing pouch, which corresponds to the presumptive wing region of the wing disc. This specific expression pattern is correlated with a high level of neutral lipid accumulation. We also showed that neutral lipid deposition in the wing disc is severely reduced in an Lsd-2 mutant and is increased with Lsd-2 overexpression. Finally, we showed that overexpression of the vestigial (vg) pro-wing gene induces Lsd-2 expression, suggesting that Lsd-2 mediates a vg role during wing formation. Our results suggest that Lsd-2 function is not restricted to tissues directly involved in lipid storage and could play additional roles during development.},
keywords = {Animals, Biological, Drosophila, Drosophila Proteins, Embryo, Fat Body, Genes, I2CT, Imagerie, Insect, Larva, Lipid Metabolism, Metamorphosis, Mutation, Nonmammalian, Nuclear Proteins, Phosphoproteins, Wing},
pubstate = {published},
tppubtype = {article}
}
Lipid droplets are the major neutral lipid storage organelles in higher eukaryotes. The PAT domain proteins (Perilipin, ADRP [adipose differentiation related protein], and TIP47 [tail-interacting 47-kDa protein]) are associated with these structures. Perilipin and ADRP are involved in the regulation of lipid storage and metabolism in mammals. Two genes encoding PAT proteins, Drosophila Lipid Storage Droplet 2 Gene (Lsd-2) and Lsd-2, have been identified in Drosophila. Lsd-2 is expressed in fat bodies and in the female germ line and is involved in lipid storage in these tissues. We showed that Lsd-2 is expressed in third-instar wing imaginal discs in Drosophila, with higher levels in the wing pouch, which corresponds to the presumptive wing region of the wing disc. This specific expression pattern is correlated with a high level of neutral lipid accumulation. We also showed that neutral lipid deposition in the wing disc is severely reduced in an Lsd-2 mutant and is increased with Lsd-2 overexpression. Finally, we showed that overexpression of the vestigial (vg) pro-wing gene induces Lsd-2 expression, suggesting that Lsd-2 mediates a vg role during wing formation. Our results suggest that Lsd-2 function is not restricted to tissues directly involved in lipid storage and could play additional roles during development.
Imler Jean-Luc, Bulet Philippe
Antimicrobial peptides in Drosophila: structures, activities and gene regulation Article de journal
Dans: Chemical Immunology and Allergy, vol. 86, p. 1–21, 2005, ISSN: 1660-2242.
Résumé | Liens | BibTeX | Étiquettes: Animals, Antimicrobial Cationic Peptides, Defensins, Gene Expression Regulation, Genes, Glycopeptides, imler, Immunity, Innate, Insect, Insect Proteins, M3i, Molecular Structure, Signal Transduction
@article{imler_antimicrobial_2005,
title = {Antimicrobial peptides in Drosophila: structures, activities and gene regulation},
author = {Jean-Luc Imler and Philippe Bulet},
doi = {10.1159/000086648},
issn = {1660-2242},
year = {2005},
date = {2005-01-01},
journal = {Chemical Immunology and Allergy},
volume = {86},
pages = {1--21},
abstract = {The production of antimicrobial peptides (AMPs) is an important aspect of host-defence in multicellular organisms. Biochemical analysis of the hemolymph of the fruit-fly Drosophila melanogaster and other Diptera has led to the discovery of eight classes of AMPs. These peptides can be grouped into three families based on their main biological targets, gram-positive bacteria (defensin), gram-negative bacteria (cecropins, drosocin, attacins, diptericin, MPAC), or fungi (drosomycin, metchnikowin). Drosophila AMPs are synthesized by the fat body in response to infection, and secreted into the blood. Most of them can also be induced in surface epithelia in a tissue-specific manner. Finally, some of them are constitutively expressed in defined tissues, such as the salivary glands or the reproductive tract. We review here the structures and activities of these AMPs, as well as the signalling cascades, which lead to their induction upon detection of infectious non-self.},
keywords = {Animals, Antimicrobial Cationic Peptides, Defensins, Gene Expression Regulation, Genes, Glycopeptides, imler, Immunity, Innate, Insect, Insect Proteins, M3i, Molecular Structure, Signal Transduction},
pubstate = {published},
tppubtype = {article}
}
The production of antimicrobial peptides (AMPs) is an important aspect of host-defence in multicellular organisms. Biochemical analysis of the hemolymph of the fruit-fly Drosophila melanogaster and other Diptera has led to the discovery of eight classes of AMPs. These peptides can be grouped into three families based on their main biological targets, gram-positive bacteria (defensin), gram-negative bacteria (cecropins, drosocin, attacins, diptericin, MPAC), or fungi (drosomycin, metchnikowin). Drosophila AMPs are synthesized by the fat body in response to infection, and secreted into the blood. Most of them can also be induced in surface epithelia in a tissue-specific manner. Finally, some of them are constitutively expressed in defined tissues, such as the salivary glands or the reproductive tract. We review here the structures and activities of these AMPs, as well as the signalling cascades, which lead to their induction upon detection of infectious non-self.
2004
Martineau Y., Bec C. Le, Monbrun L., Allo V., Chiu I. M., Danos O., Moine H., Prats H., Prats A. C.
Internal ribosome entry site structural motifs conserved among mammalian fibroblast growth factor 1 alternatively spliced mRNAs Article de journal
Dans: Mol Cell Biol, vol. 24, no. 17, p. 7622-35, 2004, (0270-7306 Journal Article).
Résumé | BibTeX | Étiquettes: (Genetics), *5', *Alternative, *Nucleic, *Promoter, 1/*genetics, Acid, Alignment, Animals, Base, Cell, Conformation, Data, EHRESMANN, Factor, Fibroblast, Gene, Genes, Genetic, Gov't, Growth, Human, Line, Messenger/chemistry/*genetics/metabolism, Mice, Molecular, Muscle, Mutagenesis, Non-U.S., Regions, Ribosomes/*metabolism, RNA, Sequence, Site-Directed, Skeletal/cytology/physiology, Splicing, Structural/genetics, Support, Techniques, Transfer, Untranslated, Vectors
@article{,
title = {Internal ribosome entry site structural motifs conserved among mammalian fibroblast growth factor 1 alternatively spliced mRNAs},
author = { Y. Martineau and C. Le Bec and L. Monbrun and V. Allo and I. M. Chiu and O. Danos and H. Moine and H. Prats and A. C. Prats},
year = {2004},
date = {2004-01-01},
journal = {Mol Cell Biol},
volume = {24},
number = {17},
pages = {7622-35},
abstract = {Fibroblast growth factor 1 (FGF-1) is a powerful angiogenic factor whose gene structure contains four promoters, giving rise to a process of alternative splicing resulting in four mRNAs with alternative 5' untranslated regions (5' UTRs). Here we have identified, by using double luciferase bicistronic vectors, the presence of internal ribosome entry sites (IRESs) in the human FGF-1 5' UTRs, particularly in leaders A and C, with distinct activities in mammalian cells. DNA electrotransfer in mouse muscle revealed that the IRES present in the FGF-1 leader A has a high activity in vivo. We have developed a new regulatable TET OFF bicistronic system, which allowed us to rule out the possibility of any cryptic promoter in the FGF-1 leaders. FGF-1 IRESs A and C, which were mapped in fragments of 118 and 103 nucleotides, respectively, are flexible in regard to the position of the initiation codon, making them interesting from a biotechnological point of view. Furthermore, we show that FGF-1 IRESs A of murine and human origins show similar IRES activity profiles. Enzymatic and chemical probing of the FGF-1 IRES A RNA revealed a structural domain conserved among mammals at both the nucleotide sequence and RNA structure levels. The functional role of this structural motif has been demonstrated by point mutagenesis, including compensatory mutations. These data favor an important role of IRESs in the control of FGF-1 expression and provide a new IRES structural motif that could help IRES prediction in 5' UTR databases.},
note = {0270-7306
Journal Article},
keywords = {(Genetics), *5', *Alternative, *Nucleic, *Promoter, 1/*genetics, Acid, Alignment, Animals, Base, Cell, Conformation, Data, EHRESMANN, Factor, Fibroblast, Gene, Genes, Genetic, Gov't, Growth, Human, Line, Messenger/chemistry/*genetics/metabolism, Mice, Molecular, Muscle, Mutagenesis, Non-U.S., Regions, Ribosomes/*metabolism, RNA, Sequence, Site-Directed, Skeletal/cytology/physiology, Splicing, Structural/genetics, Support, Techniques, Transfer, Untranslated, Vectors},
pubstate = {published},
tppubtype = {article}
}
Fibroblast growth factor 1 (FGF-1) is a powerful angiogenic factor whose gene structure contains four promoters, giving rise to a process of alternative splicing resulting in four mRNAs with alternative 5' untranslated regions (5' UTRs). Here we have identified, by using double luciferase bicistronic vectors, the presence of internal ribosome entry sites (IRESs) in the human FGF-1 5' UTRs, particularly in leaders A and C, with distinct activities in mammalian cells. DNA electrotransfer in mouse muscle revealed that the IRES present in the FGF-1 leader A has a high activity in vivo. We have developed a new regulatable TET OFF bicistronic system, which allowed us to rule out the possibility of any cryptic promoter in the FGF-1 leaders. FGF-1 IRESs A and C, which were mapped in fragments of 118 and 103 nucleotides, respectively, are flexible in regard to the position of the initiation codon, making them interesting from a biotechnological point of view. Furthermore, we show that FGF-1 IRESs A of murine and human origins show similar IRES activity profiles. Enzymatic and chemical probing of the FGF-1 IRES A RNA revealed a structural domain conserved among mammals at both the nucleotide sequence and RNA structure levels. The functional role of this structural motif has been demonstrated by point mutagenesis, including compensatory mutations. These data favor an important role of IRESs in the control of FGF-1 expression and provide a new IRES structural motif that could help IRES prediction in 5' UTR databases.
Blandin Stéphanie A, Levashina Elena A
Mosquito immune responses against malaria parasites Article de journal
Dans: Curr. Opin. Immunol., vol. 16, no. 1, p. 16–20, 2004, ISSN: 0952-7915.
Résumé | BibTeX | Étiquettes: Animals, Anopheles, blandin, Gene Library, Genes, Hemocytes, Host-Parasite Interactions, Immunity, Innate, Insect, Insect Vectors, M3i, Malaria, Plasmodium
@article{blandin_mosquito_2004,
title = {Mosquito immune responses against malaria parasites},
author = {Stéphanie A Blandin and Elena A Levashina},
issn = {0952-7915},
year = {2004},
date = {2004-01-01},
journal = {Curr. Opin. Immunol.},
volume = {16},
number = {1},
pages = {16--20},
abstract = {Anopheline mosquitoes are the major vectors of human malaria. Mosquito-parasite interactions are a critical aspect of disease transmission and a potential target for malaria control. Mosquitoes vary in their innate ability to support development of the malaria parasite, but the molecular mechanisms that determine vector competence are poorly understood. This area of research has been revolutionized by recent advances in the mosquito genome characterization and by the development of new tools for functional gene analysis.},
keywords = {Animals, Anopheles, blandin, Gene Library, Genes, Hemocytes, Host-Parasite Interactions, Immunity, Innate, Insect, Insect Vectors, M3i, Malaria, Plasmodium},
pubstate = {published},
tppubtype = {article}
}
Anopheline mosquitoes are the major vectors of human malaria. Mosquito-parasite interactions are a critical aspect of disease transmission and a potential target for malaria control. Mosquitoes vary in their innate ability to support development of the malaria parasite, but the molecular mechanisms that determine vector competence are poorly understood. This area of research has been revolutionized by recent advances in the mosquito genome characterization and by the development of new tools for functional gene analysis.
2003
Gobert Vanessa, Gottar Marie, Matskevich Alexey A, Rutschmann Sophie, Royet Julien, Belvin Marcia, Hoffmann Jules A, Ferrandon Dominique
Dual activation of the Drosophila toll pathway by two pattern recognition receptors Article de journal
Dans: Science, vol. 302, no. 5653, p. 2126–2130, 2003, ISSN: 1095-9203.
Résumé | Liens | BibTeX | Étiquettes: Animals, Carrier Proteins, Cell Surface, DNA Transposable Elements, ferrandon, Gene Expression, Genes, Gram-Negative Bacteria, Gram-Positive Bacteria, Hemolymph, hoffmann, Hypocreales, Insect, Insect Proteins, M3i, Mutation, Phenotype, Receptors, Serine Endopeptidases, Toll-Like Receptors
@article{gobert_dual_2003,
title = {Dual activation of the Drosophila toll pathway by two pattern recognition receptors},
author = {Vanessa Gobert and Marie Gottar and Alexey A Matskevich and Sophie Rutschmann and Julien Royet and Marcia Belvin and Jules A Hoffmann and Dominique Ferrandon},
doi = {10.1126/science.1085432},
issn = {1095-9203},
year = {2003},
date = {2003-12-01},
journal = {Science},
volume = {302},
number = {5653},
pages = {2126--2130},
abstract = {The Toll-dependent defense against Gram-positive bacterial infections in Drosophila is mediated through the peptidoglycan recognition protein SA (PGRP-SA). A mutation termed osiris disrupts the Gram-negative binding protein 1 (GNBP1) gene and leads to compromised survival of mutant flies after Gram-positive infections, but not after fungal or Gram-negative bacterial challenge. Our results demonstrate that GNBP1 and PGRP-SA can jointly activate the Toll pathway. The potential for a combination of distinct proteins to mediate detection of infectious nonself in the fly will refine the concept of pattern recognition in insects.},
keywords = {Animals, Carrier Proteins, Cell Surface, DNA Transposable Elements, ferrandon, Gene Expression, Genes, Gram-Negative Bacteria, Gram-Positive Bacteria, Hemolymph, hoffmann, Hypocreales, Insect, Insect Proteins, M3i, Mutation, Phenotype, Receptors, Serine Endopeptidases, Toll-Like Receptors},
pubstate = {published},
tppubtype = {article}
}
The Toll-dependent defense against Gram-positive bacterial infections in Drosophila is mediated through the peptidoglycan recognition protein SA (PGRP-SA). A mutation termed osiris disrupts the Gram-negative binding protein 1 (GNBP1) gene and leads to compromised survival of mutant flies after Gram-positive infections, but not after fungal or Gram-negative bacterial challenge. Our results demonstrate that GNBP1 and PGRP-SA can jointly activate the Toll pathway. The potential for a combination of distinct proteins to mediate detection of infectious nonself in the fly will refine the concept of pattern recognition in insects.
2002
Christophides George K, Zdobnov Evgeny, Barillas-Mury Carolina, Birney Ewan, Blandin Stephanie A, Blass Claudia, Brey Paul T, Collins Frank H, Danielli Alberto, Dimopoulos George, Hetru Charles, Hoa Ngo T, Hoffmann Jules A, Kanzok Stefan M, Letunic Ivica, Levashina Elena A, Loukeris Thanasis G, Lycett Gareth, Meister Stephan, Michel Kristin, Moita Luis F, Müller Hans-Michael, Osta Mike A, Paskewitz Susan M, Reichhart Jean-Marc, Rzhetsky Andrey, Troxler Laurent, Vernick Kenneth D, Vlachou Dina, Volz Jennifer, von Mering Christian, Xu Jiannong, Zheng Liangbiao, Bork Peer, Kafatos Fotis C
Immunity-related genes and gene families in Anopheles gambiae Article de journal
Dans: Science, vol. 298, no. 5591, p. 159–165, 2002, ISSN: 1095-9203.
Résumé | Liens | BibTeX | Étiquettes: Alternative Splicing, Animals, Anopheles, Apoptosis, bacteria, bioinformatic, blandin, Catechol Oxidase, Computational Biology, Enzyme Precursors, Gene Expression Regulation, Genes, Genetic, Genome, hoffmann, Immunity, Innate, Insect, Insect Proteins, M3i, Multigene Family, Peptides, Phylogeny, Plasmodium, Protein Structure, reichhart, Selection, Serine Endopeptidases, Serpins, Signal Transduction, Tertiary
@article{christophides_immunity-related_2002,
title = {Immunity-related genes and gene families in Anopheles gambiae},
author = {George K Christophides and Evgeny Zdobnov and Carolina Barillas-Mury and Ewan Birney and Stephanie A Blandin and Claudia Blass and Paul T Brey and Frank H Collins and Alberto Danielli and George Dimopoulos and Charles Hetru and Ngo T Hoa and Jules A Hoffmann and Stefan M Kanzok and Ivica Letunic and Elena A Levashina and Thanasis G Loukeris and Gareth Lycett and Stephan Meister and Kristin Michel and Luis F Moita and Hans-Michael Müller and Mike A Osta and Susan M Paskewitz and Jean-Marc Reichhart and Andrey Rzhetsky and Laurent Troxler and Kenneth D Vernick and Dina Vlachou and Jennifer Volz and Christian von Mering and Jiannong Xu and Liangbiao Zheng and Peer Bork and Fotis C Kafatos},
url = {http://www.ncbi.nlm.nih.gov/pubmed/12364793},
doi = {10.1126/science.1077136},
issn = {1095-9203},
year = {2002},
date = {2002-10-01},
journal = {Science},
volume = {298},
number = {5591},
pages = {159--165},
abstract = {We have identified 242 Anopheles gambiae genes from 18 gene families implicated in innate immunity and have detected marked diversification relative to Drosophila melanogaster. Immune-related gene families involved in recognition, signal modulation, and effector systems show a marked deficit of orthologs and excessive gene expansions, possibly reflecting selection pressures from different pathogens encountered in these insects' very different life-styles. In contrast, the multifunctional Toll signal transduction pathway is substantially conserved, presumably because of counterselection for developmental stability. Representative expression profiles confirm that sequence diversification is accompanied by specific responses to different immune challenges. Alternative RNA splicing may also contribute to expansion of the immune repertoire.},
keywords = {Alternative Splicing, Animals, Anopheles, Apoptosis, bacteria, bioinformatic, blandin, Catechol Oxidase, Computational Biology, Enzyme Precursors, Gene Expression Regulation, Genes, Genetic, Genome, hoffmann, Immunity, Innate, Insect, Insect Proteins, M3i, Multigene Family, Peptides, Phylogeny, Plasmodium, Protein Structure, reichhart, Selection, Serine Endopeptidases, Serpins, Signal Transduction, Tertiary},
pubstate = {published},
tppubtype = {article}
}
We have identified 242 Anopheles gambiae genes from 18 gene families implicated in innate immunity and have detected marked diversification relative to Drosophila melanogaster. Immune-related gene families involved in recognition, signal modulation, and effector systems show a marked deficit of orthologs and excessive gene expansions, possibly reflecting selection pressures from different pathogens encountered in these insects' very different life-styles. In contrast, the multifunctional Toll signal transduction pathway is substantially conserved, presumably because of counterselection for developmental stability. Representative expression profiles confirm that sequence diversification is accompanied by specific responses to different immune challenges. Alternative RNA splicing may also contribute to expansion of the immune repertoire.
Ligoxygakis Petros, Pelte Nadège, Hoffmann Jules A, Reichhart Jean-Marc
Activation of Drosophila Toll during fungal infection by a blood serine protease Article de journal
Dans: Science, vol. 297, no. 5578, p. 114–116, 2002, ISSN: 1095-9203.
Résumé | Liens | BibTeX | Étiquettes: Animals, Cell Surface, Chromosome Mapping, Escherichia coli, Female, Gene Expression Regulation, Genes, Gram-Positive Cocci, Hemolymph, hoffmann, Hypocreales, Insect, Insect Proteins, M3i, Male, Mutation, Protein Sorting Signals, Protein Structure, Receptors, reichhart, Serine Endopeptidases, Tertiary, Toll-Like Receptors
@article{ligoxygakis_activation_2002,
title = {Activation of Drosophila Toll during fungal infection by a blood serine protease},
author = {Petros Ligoxygakis and Nadège Pelte and Jules A Hoffmann and Jean-Marc Reichhart},
doi = {10.1126/science.1072391},
issn = {1095-9203},
year = {2002},
date = {2002-07-01},
journal = {Science},
volume = {297},
number = {5578},
pages = {114--116},
abstract = {Drosophila host defense to fungal and Gram-positive bacterial infection is mediated by the Spaetzle/Toll/cactus gene cassette. It has been proposed that Toll does not function as a pattern recognition receptor per se but is activated through a cleaved form of the cytokine Spaetzle. The upstream events linking infection to the cleavage of Spaetzle have long remained elusive. Here we report the identification of a central component of the fungal activation of Toll. We show that ethylmethane sulfonate-induced mutations in the persephone gene, which encodes a previously unknown serine protease, block induction of the Toll pathway by fungi and resistance to this type of infection.},
keywords = {Animals, Cell Surface, Chromosome Mapping, Escherichia coli, Female, Gene Expression Regulation, Genes, Gram-Positive Cocci, Hemolymph, hoffmann, Hypocreales, Insect, Insect Proteins, M3i, Male, Mutation, Protein Sorting Signals, Protein Structure, Receptors, reichhart, Serine Endopeptidases, Tertiary, Toll-Like Receptors},
pubstate = {published},
tppubtype = {article}
}
Drosophila host defense to fungal and Gram-positive bacterial infection is mediated by the Spaetzle/Toll/cactus gene cassette. It has been proposed that Toll does not function as a pattern recognition receptor per se but is activated through a cleaved form of the cytokine Spaetzle. The upstream events linking infection to the cleavage of Spaetzle have long remained elusive. Here we report the identification of a central component of the fungal activation of Toll. We show that ethylmethane sulfonate-induced mutations in the persephone gene, which encodes a previously unknown serine protease, block induction of the Toll pathway by fungi and resistance to this type of infection.
Gottar Marie, Gobert Vanessa, Michel Tatiana, Belvin Marcia, Duyk Geoffrey, Hoffmann Jules A, Ferrandon Dominique, Royet Julien
The Drosophila immune response against Gram-negative bacteria is mediated by a peptidoglycan recognition protein Article de journal
Dans: Nature, vol. 416, p. 640–644, 2002, ISBN: 0028-0836.
Résumé | Liens | BibTeX | Étiquettes: Animal, Anti-Infective Agents/metabolism, Carrier Proteins/biosynthesis/genetics/*immunology, Drosophila melanogaster/genetics/*immunology/*microbiology, Drosophila Proteins/genetics/metabolism, Epistasis, Female, ferrandon, Genes, Genetic, Genetic Predisposition to Disease, Gram-Negative Bacteria/*immunology/physiology, hoffmann, Human, Insect/genetics, M3i, Messenger/genetics/metabolism, Mutation, Non-U.S. Gov't, P.H.S., Phenotype, RNA, Signal Transduction, Support, Survival Rate, Transgenes/genetics, U.S. Gov't
@article{gottar_drosophila_2002b,
title = {The Drosophila immune response against Gram-negative bacteria is mediated by a peptidoglycan recognition protein},
author = {Marie Gottar and Vanessa Gobert and Tatiana Michel and Marcia Belvin and Geoffrey Duyk and Jules A Hoffmann and Dominique Ferrandon and Julien Royet},
doi = {10.1038/nature734},
isbn = {0028-0836},
year = {2002},
date = {2002-03-01},
journal = {Nature},
volume = {416},
pages = {640--644},
abstract = {The antimicrobial defence of Drosophila relies largely on the challenge-induced synthesis of an array of potent antimicrobial peptides by the fat body. The defence against Gram-positive bacteria and natural fungal infections is mediated by the Toll signalling pathway, whereas defence against Gram-negative bacteria is dependent on the Immune deficiency (IMD) pathway. Loss-of-function mutations in either pathway reduce the resistance to corresponding infections. The link between microbial infections and activation of these two pathways has remained elusive. The Toll pathway is activated by Gram-positive bacteria through a circulating Peptidoglycan recognition protein (PGRP-SA). PGRPs appear to be highly conserved from insects to mammals, and the Drosophila genome contains 13 members. Here we report a mutation in a gene coding for a putative transmembrane protein, PGRP-LC, which reduces survival to Gram-negative sepsis but has no effect on the response to Gram-positive bacteria or natural fungal infections. By genetic epistasis, we demonstrate that PGRP-LC acts upstream of the imd gene. The data on PGRP-SA with respect to the response to Gram-positive infections, together with the present report, indicate that the PGRP family has a principal role in sensing microbial infections in Drosophila.},
keywords = {Animal, Anti-Infective Agents/metabolism, Carrier Proteins/biosynthesis/genetics/*immunology, Drosophila melanogaster/genetics/*immunology/*microbiology, Drosophila Proteins/genetics/metabolism, Epistasis, Female, ferrandon, Genes, Genetic, Genetic Predisposition to Disease, Gram-Negative Bacteria/*immunology/physiology, hoffmann, Human, Insect/genetics, M3i, Messenger/genetics/metabolism, Mutation, Non-U.S. Gov't, P.H.S., Phenotype, RNA, Signal Transduction, Support, Survival Rate, Transgenes/genetics, U.S. Gov't},
pubstate = {published},
tppubtype = {article}
}
The antimicrobial defence of Drosophila relies largely on the challenge-induced synthesis of an array of potent antimicrobial peptides by the fat body. The defence against Gram-positive bacteria and natural fungal infections is mediated by the Toll signalling pathway, whereas defence against Gram-negative bacteria is dependent on the Immune deficiency (IMD) pathway. Loss-of-function mutations in either pathway reduce the resistance to corresponding infections. The link between microbial infections and activation of these two pathways has remained elusive. The Toll pathway is activated by Gram-positive bacteria through a circulating Peptidoglycan recognition protein (PGRP-SA). PGRPs appear to be highly conserved from insects to mammals, and the Drosophila genome contains 13 members. Here we report a mutation in a gene coding for a putative transmembrane protein, PGRP-LC, which reduces survival to Gram-negative sepsis but has no effect on the response to Gram-positive bacteria or natural fungal infections. By genetic epistasis, we demonstrate that PGRP-LC acts upstream of the imd gene. The data on PGRP-SA with respect to the response to Gram-positive infections, together with the present report, indicate that the PGRP family has a principal role in sensing microbial infections in Drosophila.
Micillino J. C., Coulais C., Binet S., Bottin M. C., Keith G., Moulin D., Rihn B. H.
Lack of genotoxicity of bitumen fumes in transgenic mouse lung Article de journal
Dans: Toxicology, vol. 170, no. 1-2, p. 11-20, 2002, (0300-483x Journal Article).
Résumé | BibTeX | Étiquettes: Adducts/drug, Aerosols, Animals, C57BL, Chromatography, DNA, DNA/drug, effects, effects/metabolism, Gases/*toxicity, Genes, Hydrocarbons/*toxicity, Inbred, Lac, Layer, Lung/*drug, Mice, Mutagenicity, Mutagens/*toxicity, Mutation/drug, Operon/genetics, Reporter/genetics, Tests, Thin, transgenic
@article{,
title = {Lack of genotoxicity of bitumen fumes in transgenic mouse lung},
author = { J. C. Micillino and C. Coulais and S. Binet and M. C. Bottin and G. Keith and D. Moulin and B. H. Rihn},
year = {2002},
date = {2002-01-01},
journal = {Toxicology},
volume = {170},
number = {1-2},
pages = {11-20},
abstract = {During hot application of bitumen containing materials, e.g. in hot paving or roofing, fumes are emitted that contain polycyclic aromatic compounds. Previous studies with rodents exposed to bitumen and coal-tar fume condensates showed formation of DNA adducts. In order to clarify the genotoxicity of bitumen fumes, we designed a study by using mice carrying a reporter gene for mutagenesis analysis and exposed by nose-only to a constant and reproducible aerosol of bitumen fumes. We analyzed the genotoxic activity of inhaled bitumen fumes generated under those controlled conditions through the induction of mutation and DNA adducts in Big Blue mice. Mice were exposed to bitumen fumes (100 mg/m(3) total particulate matter) 6 h per day during 5 days by nose-only in an inhalation chamber designed in our laboratory. Following a 30-day fixation period, the experiment was terminated and lung DNA was extracted for mutant frequency and adduct determinations. The mutant frequency was determined using the cII and the lacI mutant analysis systems. In, addition, 61 and 54 mutants were sequenced in control and exposed groups, respectively. The study did not show any mutation or adduct induction in the exposed group compared to the control group: cII mutant frequencies were 11.0+/-4.5x10(-5) and 11.0+/-4.8x10(-5) in control and exposed lungs, respectively. Identically, using the lacI mutation detection system, the mutant frequencies were 6.4+/-3.1x10(-5) and 5.8+/-2.0x10(-5). The mutation spectra of both series were quite similar with regard to transition and transversion frequencies. The absence of genotoxicity in the group exposed to 100 mg/m(3) bitumen is discussed with regard to dosage of inhaled polycyclic aromatic compounds and species.},
note = {0300-483x
Journal Article},
keywords = {Adducts/drug, Aerosols, Animals, C57BL, Chromatography, DNA, DNA/drug, effects, effects/metabolism, Gases/*toxicity, Genes, Hydrocarbons/*toxicity, Inbred, Lac, Layer, Lung/*drug, Mice, Mutagenicity, Mutagens/*toxicity, Mutation/drug, Operon/genetics, Reporter/genetics, Tests, Thin, transgenic},
pubstate = {published},
tppubtype = {article}
}
During hot application of bitumen containing materials, e.g. in hot paving or roofing, fumes are emitted that contain polycyclic aromatic compounds. Previous studies with rodents exposed to bitumen and coal-tar fume condensates showed formation of DNA adducts. In order to clarify the genotoxicity of bitumen fumes, we designed a study by using mice carrying a reporter gene for mutagenesis analysis and exposed by nose-only to a constant and reproducible aerosol of bitumen fumes. We analyzed the genotoxic activity of inhaled bitumen fumes generated under those controlled conditions through the induction of mutation and DNA adducts in Big Blue mice. Mice were exposed to bitumen fumes (100 mg/m(3) total particulate matter) 6 h per day during 5 days by nose-only in an inhalation chamber designed in our laboratory. Following a 30-day fixation period, the experiment was terminated and lung DNA was extracted for mutant frequency and adduct determinations. The mutant frequency was determined using the cII and the lacI mutant analysis systems. In, addition, 61 and 54 mutants were sequenced in control and exposed groups, respectively. The study did not show any mutation or adduct induction in the exposed group compared to the control group: cII mutant frequencies were 11.0+/-4.5x10(-5) and 11.0+/-4.8x10(-5) in control and exposed lungs, respectively. Identically, using the lacI mutation detection system, the mutant frequencies were 6.4+/-3.1x10(-5) and 5.8+/-2.0x10(-5). The mutation spectra of both series were quite similar with regard to transition and transversion frequencies. The absence of genotoxicity in the group exposed to 100 mg/m(3) bitumen is discussed with regard to dosage of inhaled polycyclic aromatic compounds and species.
Ligoxygakis Petros, Bulet Philippe, Reichhart Jean-Marc
Critical evaluation of the role of the Toll-like receptor 18-Wheeler in the host defense of Drosophila Article de journal
Dans: EMBO Rep., vol. 3, no. 7, p. 666–673, 2002, ISSN: 1469-221X.
Résumé | Liens | BibTeX | Étiquettes: Animals, Anti-Bacterial Agents, Antimicrobial Cationic Peptides, Cell Adhesion Molecules, Fat Body, Gene Expression Regulation, Genes, Immunohistochemistry, Immunologic, Insect, Insect Proteins, Larva, M3i, Mass, Matrix-Assisted Laser Desorption-Ionization, Membrane Proteins, Receptors, reichhart, Reporter, Spectrometry, Transgenes
@article{ligoxygakis_critical_2002,
title = {Critical evaluation of the role of the Toll-like receptor 18-Wheeler in the host defense of Drosophila},
author = {Petros Ligoxygakis and Philippe Bulet and Jean-Marc Reichhart},
doi = {10.1093/embo-reports/kvf130},
issn = {1469-221X},
year = {2002},
date = {2002-01-01},
journal = {EMBO Rep.},
volume = {3},
number = {7},
pages = {666--673},
abstract = {Essential aspects of innate immune responses to microbial infections appear to be conserved between insects and mammals. In particular, in both groups, transmembrane receptors of the Toll superfamily play a crucial role in activating immune defenses. The Drosophila Toll family member 18-Wheeler had been proposed to sense Gram-negative infection and direct selective expression of peptides active against Gram-negative bacteria. Here we re-examine the role of 18-Wheeler and show that in adults it is dispensable for immune responses. In larvae, 18wheeler is required for normal fat body development, and in mutant larvae induction of all antimicrobial peptide genes, and not only of those directed against Gram-negative bacteria, is compromised. 18-Wheeler does not qualify as a pattern recognition receptor of Gram-negative bacteria.},
keywords = {Animals, Anti-Bacterial Agents, Antimicrobial Cationic Peptides, Cell Adhesion Molecules, Fat Body, Gene Expression Regulation, Genes, Immunohistochemistry, Immunologic, Insect, Insect Proteins, Larva, M3i, Mass, Matrix-Assisted Laser Desorption-Ionization, Membrane Proteins, Receptors, reichhart, Reporter, Spectrometry, Transgenes},
pubstate = {published},
tppubtype = {article}
}
Essential aspects of innate immune responses to microbial infections appear to be conserved between insects and mammals. In particular, in both groups, transmembrane receptors of the Toll superfamily play a crucial role in activating immune defenses. The Drosophila Toll family member 18-Wheeler had been proposed to sense Gram-negative infection and direct selective expression of peptides active against Gram-negative bacteria. Here we re-examine the role of 18-Wheeler and show that in adults it is dispensable for immune responses. In larvae, 18wheeler is required for normal fat body development, and in mutant larvae induction of all antimicrobial peptide genes, and not only of those directed against Gram-negative bacteria, is compromised. 18-Wheeler does not qualify as a pattern recognition receptor of Gram-negative bacteria.
Tauszig-Delamasure Servane, Bilak Hana, Capovilla Maria, Hoffmann Jules A, Imler Jean-Luc
Drosophila MyD88 is required for the response to fungal and Gram-positive bacterial infections Article de journal
Dans: Nature Immunology, vol. 3, no. 1, p. 91–97, 2002, ISSN: 1529-2908.
Résumé | Liens | BibTeX | Étiquettes: Adaptor Proteins, Amino Acid, Animals, Antigens, Antimicrobial Cationic Peptides, Cell Surface, Chromosome Mapping, Differentiation, Disease Susceptibility, Enterococcus faecalis, Epistasis, Escherichia coli, Female, Gene Expression Regulation, Genes, Genetic, Genetically Modified, Gram-Negative Bacteria, hoffmann, Hypocreales, imler, Immunologic, Insect, Insect Proteins, M3i, Membrane Glycoproteins, Micrococcus luteus, Myeloid Differentiation Factor 88, Protein Structure, Protein-Serine-Threonine Kinases, Receptors, Recombinant Fusion Proteins, Sequence Alignment, Sequence Homology, Signal Transducing, Tertiary, Toll-Like Receptors, Transfection
@article{tauszig-delamasure_drosophila_2002,
title = {Drosophila MyD88 is required for the response to fungal and Gram-positive bacterial infections},
author = {Servane Tauszig-Delamasure and Hana Bilak and Maria Capovilla and Jules A Hoffmann and Jean-Luc Imler},
doi = {10.1038/ni747},
issn = {1529-2908},
year = {2002},
date = {2002-01-01},
journal = {Nature Immunology},
volume = {3},
number = {1},
pages = {91--97},
abstract = {We report here the identification and functional characterization of DmMyD88, a gene encoding the Drosophila homolog of mammalian MyD88. DmMyD88 combines a Toll-IL-1R homology (TIR) domain and a death domain. Overexpression of DmMyD88 was sufficient to induce expression of the antifungal peptide Drosomycin, and induction of Drosomycin was markedly reduced in DmMyD88-mutant flies. DmMyD88 interacted with Toll through its TIR domain and required the death domain proteins Tube and Pelle to activate expression of Drs, which encodes Drosomycin. DmMyD88-mutant flies were highly susceptible to infection by fungi and Gram-positive bacteria, but resisted Gram-negative bacterial infection much as did wild-type flies. Phenotypic comparison of DmMyD88-mutant flies and MyD88-deficient mice showed essential differences in the control of Gram-negative infection in insects and mammals.},
keywords = {Adaptor Proteins, Amino Acid, Animals, Antigens, Antimicrobial Cationic Peptides, Cell Surface, Chromosome Mapping, Differentiation, Disease Susceptibility, Enterococcus faecalis, Epistasis, Escherichia coli, Female, Gene Expression Regulation, Genes, Genetic, Genetically Modified, Gram-Negative Bacteria, hoffmann, Hypocreales, imler, Immunologic, Insect, Insect Proteins, M3i, Membrane Glycoproteins, Micrococcus luteus, Myeloid Differentiation Factor 88, Protein Structure, Protein-Serine-Threonine Kinases, Receptors, Recombinant Fusion Proteins, Sequence Alignment, Sequence Homology, Signal Transducing, Tertiary, Toll-Like Receptors, Transfection},
pubstate = {published},
tppubtype = {article}
}
We report here the identification and functional characterization of DmMyD88, a gene encoding the Drosophila homolog of mammalian MyD88. DmMyD88 combines a Toll-IL-1R homology (TIR) domain and a death domain. Overexpression of DmMyD88 was sufficient to induce expression of the antifungal peptide Drosomycin, and induction of Drosomycin was markedly reduced in DmMyD88-mutant flies. DmMyD88 interacted with Toll through its TIR domain and required the death domain proteins Tube and Pelle to activate expression of Drs, which encodes Drosomycin. DmMyD88-mutant flies were highly susceptible to infection by fungi and Gram-positive bacteria, but resisted Gram-negative bacterial infection much as did wild-type flies. Phenotypic comparison of DmMyD88-mutant flies and MyD88-deficient mice showed essential differences in the control of Gram-negative infection in insects and mammals.
2001
Michel T, Reichhart Jean-Marc, Hoffmann Jules A, Royet Julien
Drosophila Toll is activated by Gram-positive bacteria through a circulating peptidoglycan recognition protein Article de journal
Dans: Nature, vol. 414, no. 6865, p. 756–759, 2001, ISSN: 0028-0836.
Résumé | Liens | BibTeX | Étiquettes: Amino Acid, Animals, Anti-Bacterial Agents, Anti-Infective Agents, Bacillus thuringiensis, Carrier Proteins, Cell Surface, Chromosome Mapping, Enterococcus faecalis, Fungi, Genes, Gram-Positive Bacteria, Hemolymph, hoffmann, Humans, Insect, Insect Proteins, M3i, Membrane Glycoproteins, Micrococcus luteus, Mutation, Receptors, reichhart, Sequence Homology, Toll-Like Receptors
@article{michel_drosophila_2001,
title = {Drosophila Toll is activated by Gram-positive bacteria through a circulating peptidoglycan recognition protein},
author = {T Michel and Jean-Marc Reichhart and Jules A Hoffmann and Julien Royet},
doi = {10.1038/414756a},
issn = {0028-0836},
year = {2001},
date = {2001-12-01},
journal = {Nature},
volume = {414},
number = {6865},
pages = {756--759},
abstract = {Microbial infection activates two distinct intracellular signalling cascades in the immune-responsive fat body of Drosophila. Gram-positive bacteria and fungi predominantly induce the Toll signalling pathway, whereas Gram-negative bacteria activate the Imd pathway. Loss-of-function mutants in either pathway reduce the resistance to corresponding infections. Genetic screens have identified a range of genes involved in these intracellular signalling cascades, but how they are activated by microbial infection is largely unknown. Activation of the transmembrane receptor Toll requires a proteolytically cleaved form of an extracellular cytokine-like polypeptide, Spätzle, suggesting that Toll does not itself function as a bona fide recognition receptor of microbial patterns. This is in apparent contrast with the mammalian Toll-like receptors and raises the question of which host molecules actually recognize microbial patterns to activate Toll through Spätzle. Here we present a mutation that blocks Toll activation by Gram-positive bacteria and significantly decreases resistance to this type of infection. The mutation semmelweis (seml) inactivates the gene encoding a peptidoglycan recognition protein (PGRP-SA). Interestingly, seml does not affect Toll activation by fungal infection, indicating the existence of a distinct recognition system for fungi to activate the Toll pathway.},
keywords = {Amino Acid, Animals, Anti-Bacterial Agents, Anti-Infective Agents, Bacillus thuringiensis, Carrier Proteins, Cell Surface, Chromosome Mapping, Enterococcus faecalis, Fungi, Genes, Gram-Positive Bacteria, Hemolymph, hoffmann, Humans, Insect, Insect Proteins, M3i, Membrane Glycoproteins, Micrococcus luteus, Mutation, Receptors, reichhart, Sequence Homology, Toll-Like Receptors},
pubstate = {published},
tppubtype = {article}
}
Microbial infection activates two distinct intracellular signalling cascades in the immune-responsive fat body of Drosophila. Gram-positive bacteria and fungi predominantly induce the Toll signalling pathway, whereas Gram-negative bacteria activate the Imd pathway. Loss-of-function mutants in either pathway reduce the resistance to corresponding infections. Genetic screens have identified a range of genes involved in these intracellular signalling cascades, but how they are activated by microbial infection is largely unknown. Activation of the transmembrane receptor Toll requires a proteolytically cleaved form of an extracellular cytokine-like polypeptide, Spätzle, suggesting that Toll does not itself function as a bona fide recognition receptor of microbial patterns. This is in apparent contrast with the mammalian Toll-like receptors and raises the question of which host molecules actually recognize microbial patterns to activate Toll through Spätzle. Here we present a mutation that blocks Toll activation by Gram-positive bacteria and significantly decreases resistance to this type of infection. The mutation semmelweis (seml) inactivates the gene encoding a peptidoglycan recognition protein (PGRP-SA). Interestingly, seml does not affect Toll activation by fungal infection, indicating the existence of a distinct recognition system for fungi to activate the Toll pathway.
Jung Alain C, Criqui M C, Rutschmann Sophie, Hoffmann Jules A, Ferrandon Dominique
A microfluorometer assay to measure the expression of beta-galactosidase and green fluorescent protein reporter genes in single Drosophila flies Article de journal
Dans: BioTechniques, vol. 30, no. 3, p. 594–598, 600–601, 2001, ISSN: 0736-6205.
Résumé | BibTeX | Étiquettes: Animals, beta-Galactosidase, Cytophotometry, ferrandon, Genes, Green Fluorescent Proteins, hoffmann, Luminescent Proteins, M3i, Reporter
@article{jung_microfluorometer_2001,
title = {A microfluorometer assay to measure the expression of beta-galactosidase and green fluorescent protein reporter genes in single Drosophila flies},
author = {Alain C Jung and M C Criqui and Sophie Rutschmann and Jules A Hoffmann and Dominique Ferrandon},
issn = {0736-6205},
year = {2001},
date = {2001-03-01},
journal = {BioTechniques},
volume = {30},
number = {3},
pages = {594--598, 600--601},
abstract = {beta-galactosidase and green fluorescent protein (GFP) are among the most commonly used reporter genes to monitor gene expression in various organisms including Drosophila melanogaster. Their expression is usually detected in a qualitative way by direct microscopic observations of cells, tissues, or whole animals. To measure in vivo the inducibility of two antimicrobial peptide genes expressed during the Drosophila innate immune response, we have adapted two reporter gene systems based on the beta-galactosidase enzymatic activity and GFP. We have designed a 96-well microplate fluorometric assay sensitive enough to quantify the expression of both reporter genes in single flies. The assay has enabled us to process efficiently and rapidly a large number of individual mutant flies generated during an ethylmethane sulfonate saturation mutagenesis of the Drosophila genome. This method may be used in any screen that requires the quantification of reporter gene activity in individual insects.},
keywords = {Animals, beta-Galactosidase, Cytophotometry, ferrandon, Genes, Green Fluorescent Proteins, hoffmann, Luminescent Proteins, M3i, Reporter},
pubstate = {published},
tppubtype = {article}
}
beta-galactosidase and green fluorescent protein (GFP) are among the most commonly used reporter genes to monitor gene expression in various organisms including Drosophila melanogaster. Their expression is usually detected in a qualitative way by direct microscopic observations of cells, tissues, or whole animals. To measure in vivo the inducibility of two antimicrobial peptide genes expressed during the Drosophila innate immune response, we have adapted two reporter gene systems based on the beta-galactosidase enzymatic activity and GFP. We have designed a 96-well microplate fluorometric assay sensitive enough to quantify the expression of both reporter genes in single flies. The assay has enabled us to process efficiently and rapidly a large number of individual mutant flies generated during an ethylmethane sulfonate saturation mutagenesis of the Drosophila genome. This method may be used in any screen that requires the quantification of reporter gene activity in individual insects.
2000
Imler Jean-Luc, Hoffmann Jules A
Signaling mechanisms in the antimicrobial host defense of Drosophila Article de journal
Dans: Current Opinion in Microbiology, vol. 3, no. 1, p. 16–22, 2000, ISSN: 1369-5274.
Résumé | BibTeX | Étiquettes: Animals, Anti-Infective Agents, Cell Surface, Gene Expression Regulation, Genes, hoffmann, imler, Insect, Insect Proteins, M3i, Membrane Glycoproteins, Receptors, Signal Transduction, Toll-Like Receptors
@article{imler_signaling_2000,
title = {Signaling mechanisms in the antimicrobial host defense of Drosophila},
author = {Jean-Luc Imler and Jules A Hoffmann},
issn = {1369-5274},
year = {2000},
date = {2000-02-01},
journal = {Current Opinion in Microbiology},
volume = {3},
number = {1},
pages = {16--22},
abstract = {Drosophila has appeared in recent years as a powerful model to study innate immunity. Several papers published in the past year shed light on the role of the three Rel proteins Dorsal, Dif and Relish in the regulation of antimicrobial peptide expression. In addition, the discovery that a blood serine protease inhibitor is involved in the control of the antifungal response indicates that Toll is activated upon triggering of a proteolytic cascade and does not function as a Drosophila pattern recognition receptor.},
keywords = {Animals, Anti-Infective Agents, Cell Surface, Gene Expression Regulation, Genes, hoffmann, imler, Insect, Insect Proteins, M3i, Membrane Glycoproteins, Receptors, Signal Transduction, Toll-Like Receptors},
pubstate = {published},
tppubtype = {article}
}
Drosophila has appeared in recent years as a powerful model to study innate immunity. Several papers published in the past year shed light on the role of the three Rel proteins Dorsal, Dif and Relish in the regulation of antimicrobial peptide expression. In addition, the discovery that a blood serine protease inhibitor is involved in the control of the antifungal response indicates that Toll is activated upon triggering of a proteolytic cascade and does not function as a Drosophila pattern recognition receptor.
Tzou P, Ohresser S, Ferrandon Dominique, Capovilla Maria, Reichhart Jean-Marc, Lemaitre Bruno, Hoffmann Jules A, Imler Jean-Luc
Tissue-specific inducible expression of antimicrobial peptide genes in Drosophila surface epithelia Article de journal
Dans: Immunity, vol. 13, p. 737–48., 2000, ISSN: 1074-7613.
Résumé | BibTeX | Étiquettes: *Genes, Animal, Anti-Infective Agents/*immunology/metabolism, Drosophila/genetics/*immunology, ferrandon, Gene Expression Regulation/*immunology, Genes, Glycoside Hydrolases/immunology, hoffmann, Human, imler, Insect, Insect Proteins/genetics/immunology, M3i, Non-U.S. Gov't, Organ Specificity, P.H.S., reichhart, Reporter, Support, Transfection, U.S. Gov't
@article{tzou_tissue-specific_2000b,
title = {Tissue-specific inducible expression of antimicrobial peptide genes in Drosophila surface epithelia},
author = {P Tzou and S Ohresser and Dominique Ferrandon and Maria Capovilla and Jean-Marc Reichhart and Bruno Lemaitre and Jules A Hoffmann and Jean-Luc Imler},
issn = {1074-7613},
year = {2000},
date = {2000-01-01},
journal = {Immunity},
volume = {13},
pages = {737--48.},
abstract = {The production of antimicrobial peptides is an important aspect of host defense in multicellular organisms. In Drosophila, seven antimicrobial peptides with different spectra of activities are synthesized by the fat body during the immune response and secreted into the hemolymph. Using GFP reporter transgenes, we show here that all seven Drosophila antimicrobial peptides can be induced in surface epithelia in a tissue-specific manner. The imd gene plays a critical role in the activation of this local response to infection. In particular, drosomycin expression, which is regulated by the Toll pathway during the systemic response, is regulated by imd in the respiratory tract, thus demonstrating the existence of distinct regulatory mechanisms for local and systemic induction of antimicrobial peptide genes in Drosophila.},
keywords = {*Genes, Animal, Anti-Infective Agents/*immunology/metabolism, Drosophila/genetics/*immunology, ferrandon, Gene Expression Regulation/*immunology, Genes, Glycoside Hydrolases/immunology, hoffmann, Human, imler, Insect, Insect Proteins/genetics/immunology, M3i, Non-U.S. Gov't, Organ Specificity, P.H.S., reichhart, Reporter, Support, Transfection, U.S. Gov't},
pubstate = {published},
tppubtype = {article}
}
The production of antimicrobial peptides is an important aspect of host defense in multicellular organisms. In Drosophila, seven antimicrobial peptides with different spectra of activities are synthesized by the fat body during the immune response and secreted into the hemolymph. Using GFP reporter transgenes, we show here that all seven Drosophila antimicrobial peptides can be induced in surface epithelia in a tissue-specific manner. The imd gene plays a critical role in the activation of this local response to infection. In particular, drosomycin expression, which is regulated by the Toll pathway during the systemic response, is regulated by imd in the respiratory tract, thus demonstrating the existence of distinct regulatory mechanisms for local and systemic induction of antimicrobial peptide genes in Drosophila.
Imler Jean-Luc, Tauszig Servane, Jouanguy Emmanuelle, Forestier C, Hoffmann Jules A
LPS-induced immune response in Drosophila Article de journal
Dans: Journal of Endotoxin Research, vol. 6, no. 6, p. 459–462, 2000, ISSN: 0968-0519.
Résumé | BibTeX | Étiquettes: Animals, Biological, Cell Line, Cell Surface, Defensins, Genes, Genetic, hoffmann, imler, Insect, Insect Proteins, Lipopolysaccharides, M3i, Membrane Glycoproteins, Models, Mutation, Promoter Regions, Receptors, Signal Transduction, Toll-Like Receptors
@article{imler_lps-induced_2000,
title = {LPS-induced immune response in Drosophila},
author = {Jean-Luc Imler and Servane Tauszig and Emmanuelle Jouanguy and C Forestier and Jules A Hoffmann},
issn = {0968-0519},
year = {2000},
date = {2000-01-01},
journal = {Journal of Endotoxin Research},
volume = {6},
number = {6},
pages = {459--462},
abstract = {The study of the regulation of the inducible synthesis of antimicrobial peptides in Drosophila melanogaster has established this insect as a powerful model in which to study innate immunity. In particular, the molecular characterization of the regulatory pathway controlling the antifungal peptide drosomycin has revealed the importance of Toll receptors in innate immunity. We report here that injection of LPS into flies induces an immune response, suggesting that LPS receptors are used in Drosophila to detect Gram-negative bacteria infection. We have identified in the recently sequenced genome of Drosophila eight genes coding for Toll-like receptors in addition to Toll, which may function as LPS receptors. However, overexpression of a selection of these genes in tissue-culture cells does not result in up-regulation of the antibacterial peptide genes. These results are discussed in light of the recent data from genetic screens aimed at identifying the genes controlling the antibacterial response in Drosophila.},
keywords = {Animals, Biological, Cell Line, Cell Surface, Defensins, Genes, Genetic, hoffmann, imler, Insect, Insect Proteins, Lipopolysaccharides, M3i, Membrane Glycoproteins, Models, Mutation, Promoter Regions, Receptors, Signal Transduction, Toll-Like Receptors},
pubstate = {published},
tppubtype = {article}
}
The study of the regulation of the inducible synthesis of antimicrobial peptides in Drosophila melanogaster has established this insect as a powerful model in which to study innate immunity. In particular, the molecular characterization of the regulatory pathway controlling the antifungal peptide drosomycin has revealed the importance of Toll receptors in innate immunity. We report here that injection of LPS into flies induces an immune response, suggesting that LPS receptors are used in Drosophila to detect Gram-negative bacteria infection. We have identified in the recently sequenced genome of Drosophila eight genes coding for Toll-like receptors in addition to Toll, which may function as LPS receptors. However, overexpression of a selection of these genes in tissue-culture cells does not result in up-regulation of the antibacterial peptide genes. These results are discussed in light of the recent data from genetic screens aimed at identifying the genes controlling the antibacterial response in Drosophila.
Meister Marie, Hetru Charles, Hoffmann Jules A
The antimicrobial host defense of Drosophila Article de journal
Dans: Curr. Top. Microbiol. Immunol., vol. 248, p. 17–36, 2000, ISSN: 0070-217X.
BibTeX | Étiquettes: Animals, Anti-Infective Agents, Fat Body, Genes, hoffmann, Insect, Insect Proteins, M3i
@article{meister_antimicrobial_2000,
title = {The antimicrobial host defense of Drosophila},
author = {Marie Meister and Charles Hetru and Jules A Hoffmann},
issn = {0070-217X},
year = {2000},
date = {2000-01-01},
journal = {Curr. Top. Microbiol. Immunol.},
volume = {248},
pages = {17--36},
keywords = {Animals, Anti-Infective Agents, Fat Body, Genes, hoffmann, Insect, Insect Proteins, M3i},
pubstate = {published},
tppubtype = {article}
}
1999
Otten L, Salomone J Y, Helfer A, Schmidt J, Hammann P, Ruffray P De
Sequence and functional analysis of the left-hand part of the Ŧ-region from the nopaline-type Ti plasmid, pTiC58. Article de journal
Dans: Plant molecular biology, vol. 41, no. 6, p. 765–776, 1999, ISSN: 0167-4412 0167-4412, (Place: Netherlands).
Résumé | Liens | BibTeX | Étiquettes: Agrobacterium tumefaciens/*genetics/pathogenicity, Bacterial/chemistry/*genetics, Bacterial/genetics, Chromosome Mapping, DNA, Gene Deletion, Genes, Genetic Complementation Test, Lycopersicon esculentum/genetics/microbiology, Medicinal/genetics/microbiology, Molecular Sequence Data, Mutation, Phylogeny, Plant Tumors/genetics/microbiology, Plants, Plasmids/chemistry/*genetics, PPSE, Sequence Analysis, Species Specificity, Tobacco/genetics/microbiology, Toxic, Virulence/genetics
@article{otten_sequence_1999,
title = {Sequence and functional analysis of the left-hand part of the Ŧ-region from the nopaline-type Ti plasmid, pTiC58.},
author = {L Otten and J Y Salomone and A Helfer and J Schmidt and P Hammann and P De Ruffray},
doi = {10.1023/a:1006370207379},
issn = {0167-4412 0167-4412},
year = {1999},
date = {1999-12-01},
journal = {Plant molecular biology},
volume = {41},
number = {6},
pages = {765--776},
abstract = {The Agrobacterium tumefaciens nopaline strain C58 transfers a large, 29 kb T-DNA into plant cells during infection. Part of this DNA (the 'common DNA') is also found on the T-DNA of octopine strains, the remaining DNA is nopaline strain-specific. Up to now, only parts of the C58 T-DNA and related T37 T-DNA have been sequenced. We have sequenced the remainder of the nopaline-specific T-DNA (containing genes a to d) and acs to iaaM. Gene c codes for a new unknown T-DNA protein. Gene a is homologous to the agrocinopine synthase gene. Genes b, c', d and e are part of a larger family: they are related to the T-DNA genes 5, rolB, lso and 3'. Genes 5, rolB and lso induce or modify plant growth and have been called T-DNA oncogenes. Our studies show that gene 3' (located on the TR-DNA of octopine strains) is also oncogenic. Although the b-e T-DNA fragment from C58 and its individual genes lack growth-inducing activity, an a-acs deletion mutant was distinctly less virulent on Kalanchoe daigremontiana and showed reduced shoot formation on Kalanchoe tubiflora. Shoot formation could be restored by genes c and c' in co-infection experiments. Contrary to an earlier report, a C58 e gene deletion mutant was fully virulent on all plants tested.},
note = {Place: Netherlands},
keywords = {Agrobacterium tumefaciens/*genetics/pathogenicity, Bacterial/chemistry/*genetics, Bacterial/genetics, Chromosome Mapping, DNA, Gene Deletion, Genes, Genetic Complementation Test, Lycopersicon esculentum/genetics/microbiology, Medicinal/genetics/microbiology, Molecular Sequence Data, Mutation, Phylogeny, Plant Tumors/genetics/microbiology, Plants, Plasmids/chemistry/*genetics, PPSE, Sequence Analysis, Species Specificity, Tobacco/genetics/microbiology, Toxic, Virulence/genetics},
pubstate = {published},
tppubtype = {article}
}
The Agrobacterium tumefaciens nopaline strain C58 transfers a large, 29 kb T-DNA into plant cells during infection. Part of this DNA (the 'common DNA') is also found on the T-DNA of octopine strains, the remaining DNA is nopaline strain-specific. Up to now, only parts of the C58 T-DNA and related T37 T-DNA have been sequenced. We have sequenced the remainder of the nopaline-specific T-DNA (containing genes a to d) and acs to iaaM. Gene c codes for a new unknown T-DNA protein. Gene a is homologous to the agrocinopine synthase gene. Genes b, c', d and e are part of a larger family: they are related to the T-DNA genes 5, rolB, lso and 3'. Genes 5, rolB and lso induce or modify plant growth and have been called T-DNA oncogenes. Our studies show that gene 3' (located on the TR-DNA of octopine strains) is also oncogenic. Although the b-e T-DNA fragment from C58 and its individual genes lack growth-inducing activity, an a-acs deletion mutant was distinctly less virulent on Kalanchoe daigremontiana and showed reduced shoot formation on Kalanchoe tubiflora. Shoot formation could be restored by genes c and c' in co-infection experiments. Contrary to an earlier report, a C58 e gene deletion mutant was fully virulent on all plants tested.
Levashina Elena A, Langley E, Green C, Gubb David, Ashburner M, Hoffmann Jules A, Reichhart Jean-Marc
Constitutive activation of toll-mediated antifungal defense in serpin-deficient Drosophila Article de journal
Dans: Science, vol. 285, no. 5435, p. 1917–1919, 1999, ISSN: 0036-8075.
Résumé | BibTeX | Étiquettes: Animals, Antifungal Agents, Antimicrobial Cationic Peptides, Body Patterning, Cell Surface, Escherichia coli, Genes, Hemolymph, hoffmann, Insect, Insect Proteins, M3i, Membrane Glycoproteins, Micrococcus luteus, Mutagenesis, Peptides, Receptors, Recombinant Fusion Proteins, reichhart, Serine Proteinase Inhibitors, Serpins, Signal Transduction, Toll-Like Receptors, Up-Regulation
@article{levashina_constitutive_1999,
title = {Constitutive activation of toll-mediated antifungal defense in serpin-deficient Drosophila},
author = {Elena A Levashina and E Langley and C Green and David Gubb and M Ashburner and Jules A Hoffmann and Jean-Marc Reichhart},
issn = {0036-8075},
year = {1999},
date = {1999-09-01},
journal = {Science},
volume = {285},
number = {5435},
pages = {1917--1919},
abstract = {The antifungal defense of Drosophila is controlled by the spaetzle/Toll/cactus gene cassette. Here, a loss-of-function mutation in the gene encoding a blood serine protease inhibitor, Spn43Ac, was shown to lead to constitutive expression of the antifungal peptide drosomycin, and this effect was mediated by the spaetzle and Toll gene products. Spaetzle was cleaved by proteolytic enzymes to its active ligand form shortly after immune challenge, and cleaved Spaetzle was constitutively present in Spn43Ac-deficient flies. Hence, Spn43Ac negatively regulates the Toll signaling pathway, and Toll does not function as a pattern recognition receptor in the Drosophila host defense.},
keywords = {Animals, Antifungal Agents, Antimicrobial Cationic Peptides, Body Patterning, Cell Surface, Escherichia coli, Genes, Hemolymph, hoffmann, Insect, Insect Proteins, M3i, Membrane Glycoproteins, Micrococcus luteus, Mutagenesis, Peptides, Receptors, Recombinant Fusion Proteins, reichhart, Serine Proteinase Inhibitors, Serpins, Signal Transduction, Toll-Like Receptors, Up-Regulation},
pubstate = {published},
tppubtype = {article}
}
The antifungal defense of Drosophila is controlled by the spaetzle/Toll/cactus gene cassette. Here, a loss-of-function mutation in the gene encoding a blood serine protease inhibitor, Spn43Ac, was shown to lead to constitutive expression of the antifungal peptide drosomycin, and this effect was mediated by the spaetzle and Toll gene products. Spaetzle was cleaved by proteolytic enzymes to its active ligand form shortly after immune challenge, and cleaved Spaetzle was constitutively present in Spn43Ac-deficient flies. Hence, Spn43Ac negatively regulates the Toll signaling pathway, and Toll does not function as a pattern recognition receptor in the Drosophila host defense.
Manfruelli P, Reichhart Jean-Marc, Steward R, Hoffmann Jules A, Lemaitre Bruno
A mosaic analysis in Drosophila fat body cells of the control of antimicrobial peptide genes by the Rel proteins Dorsal and DIF Article de journal
Dans: EMBO J., vol. 18, no. 12, p. 3380–3391, 1999, ISSN: 0261-4189.
Résumé | Liens | BibTeX | Étiquettes: Animals, Anti-Infective Agents, Cell Surface, Clone Cells, DNA-Binding Proteins, Fat Body, Female, Gene Expression Regulation, Genes, hoffmann, Insect, Insect Proteins, Larva, M3i, Male, Membrane Glycoproteins, Mosaicism, Mutation, Nuclear Proteins, Phosphoproteins, Receptors, reichhart, Reporter, Signal Transduction, Toll-Like Receptors, Transcription Factors
@article{manfruelli_mosaic_1999,
title = {A mosaic analysis in Drosophila fat body cells of the control of antimicrobial peptide genes by the Rel proteins Dorsal and DIF},
author = {P Manfruelli and Jean-Marc Reichhart and R Steward and Jules A Hoffmann and Bruno Lemaitre},
doi = {10.1093/emboj/18.12.3380},
issn = {0261-4189},
year = {1999},
date = {1999-06-01},
journal = {EMBO J.},
volume = {18},
number = {12},
pages = {3380--3391},
abstract = {Expression of the gene encoding the antifungal peptide Drosomycin in Drosophila adults is controlled by the Toll signaling pathway. The Rel proteins Dorsal and DIF (Dorsal-related immunity factor) are possible candidates for the transactivating protein in the Toll pathway that directly regulates the drosomycin gene. We have examined the requirement of Dorsal and DIF for drosomycin expression in larval fat body cells, the predominant immune-responsive tissue, using the yeast site-specific flp/FRT recombination system to generate cell clones homozygous for a deficiency uncovering both the dorsal and the dif genes. Here we show that in the absence of both genes, the immune-inducibility of drosomycin is lost but can be rescued by overexpression of either dorsal or dif under the control of a heat-shock promoter. This result suggests a functional redundancy between both Rel proteins in the control of drosomycin gene expression in the larvae of Drosophila. Interestingly, the gene encoding the antibacterial peptide Diptericin remains fully inducible in the absence of the dorsal and dif genes. Finally, we have used fat body cell clones homozygous for various mutations to show that a linear activation cascade Spaetzle--textgreater Toll--textgreaterCactus--textgreaterDorsal/DIF leads to the induction of the drosomycin gene in larval fat body cells.},
keywords = {Animals, Anti-Infective Agents, Cell Surface, Clone Cells, DNA-Binding Proteins, Fat Body, Female, Gene Expression Regulation, Genes, hoffmann, Insect, Insect Proteins, Larva, M3i, Male, Membrane Glycoproteins, Mosaicism, Mutation, Nuclear Proteins, Phosphoproteins, Receptors, reichhart, Reporter, Signal Transduction, Toll-Like Receptors, Transcription Factors},
pubstate = {published},
tppubtype = {article}
}
Expression of the gene encoding the antifungal peptide Drosomycin in Drosophila adults is controlled by the Toll signaling pathway. The Rel proteins Dorsal and DIF (Dorsal-related immunity factor) are possible candidates for the transactivating protein in the Toll pathway that directly regulates the drosomycin gene. We have examined the requirement of Dorsal and DIF for drosomycin expression in larval fat body cells, the predominant immune-responsive tissue, using the yeast site-specific flp/FRT recombination system to generate cell clones homozygous for a deficiency uncovering both the dorsal and the dif genes. Here we show that in the absence of both genes, the immune-inducibility of drosomycin is lost but can be rescued by overexpression of either dorsal or dif under the control of a heat-shock promoter. This result suggests a functional redundancy between both Rel proteins in the control of drosomycin gene expression in the larvae of Drosophila. Interestingly, the gene encoding the antibacterial peptide Diptericin remains fully inducible in the absence of the dorsal and dif genes. Finally, we have used fat body cell clones homozygous for various mutations to show that a linear activation cascade Spaetzle--textgreater Toll--textgreaterCactus--textgreaterDorsal/DIF leads to the induction of the drosomycin gene in larval fat body cells.
Dumortier H, Abbal M, Fort M, Briand J P, Cantagrel A, Muller S
MHC class II gene associations with autoantibodies to U1A and SmD1 proteins Article de journal
Dans: International Immunology, vol. 11, no. 2, p. 249–257, 1999, ISSN: 0953-8178.
Résumé | Liens | BibTeX | Étiquettes: Alleles, Antibody Specificity, Autoantibodies, Autoantigens, Autoimmune Diseases, Blotting, Dumortier, Enzyme-Linked Immunosorbent Assay, Genes, HLA-DP Antigens, HLA-DP beta-Chains, HLA-DQ Antigens, HLA-DQ beta-Chains, HLA-DR Antigens, HLA-DRB1 Chains, Humans, I2CT, MHC Class II, Peptides, Rheumatic Diseases, Ribonucleoprotein, Ribonucleoproteins, RNA-Binding Proteins, Small Nuclear, snRNP Core Proteins, Team-Dumortier, U1 Small Nuclear, Western
@article{dumortier_mhc_1999,
title = {MHC class II gene associations with autoantibodies to U1A and SmD1 proteins},
author = {H Dumortier and M Abbal and M Fort and J P Briand and A Cantagrel and S Muller},
doi = {10.1093/intimm/11.2.249},
issn = {0953-8178},
year = {1999},
date = {1999-01-01},
journal = {International Immunology},
volume = {11},
number = {2},
pages = {249--257},
abstract = {Autoantibodies against U small nuclear ribonucleoproteins (snRNP) are frequently present in the serum of patients with systemic rheumatic diseases, and have been reported to be associated with HLA-DR and -DQ genes. To better define the role of HLA genes in the production of such antibodies, we studied immunogenetic associations with autoantibodies reacting with U1 RNP, U1A and SmD1 proteins, and synthetic peptides containing immunodominant linear epitopes of these proteins. Only two out of the 15 overlapping peptides of U1A (i.e. peptides 35-58 and 257-282) and three of 11 peptides of SmD1 (i.e. peptides 1-20, 44-67 and 97-119) were significantly recognized by patients' sera selected on the basis of their antibody positivity with RNP in immunodiffusion. The distribution of DRB1, DQB1 and DPB1 alleles among the anti-RNP antibody-positive patients (n = 28) and healthy control subjects was similar. Antibodies against U1A (tested in Western immunoblotting with HeLa cell extracts) were positively associated to DRB1*06 allele; antibodies reacting with SmD1 peptide 44-67 were negatively associated to DRB1*02 and DQB1*0602 alleles. No association was found between DPB1 alleles and antibodies reacting with U1A and SmD1 antigens. This first study reporting an association between autoantibodies reacting with U1A and SmD1 proteins (and peptides of these proteins), and immunogenetic markers suggest that the production of antibody subsets directed against different components (or regions of these proteins) bound to the same snRNP particle is associated with distinct MHC class II alleles.},
keywords = {Alleles, Antibody Specificity, Autoantibodies, Autoantigens, Autoimmune Diseases, Blotting, Dumortier, Enzyme-Linked Immunosorbent Assay, Genes, HLA-DP Antigens, HLA-DP beta-Chains, HLA-DQ Antigens, HLA-DQ beta-Chains, HLA-DR Antigens, HLA-DRB1 Chains, Humans, I2CT, MHC Class II, Peptides, Rheumatic Diseases, Ribonucleoprotein, Ribonucleoproteins, RNA-Binding Proteins, Small Nuclear, snRNP Core Proteins, Team-Dumortier, U1 Small Nuclear, Western},
pubstate = {published},
tppubtype = {article}
}
Autoantibodies against U small nuclear ribonucleoproteins (snRNP) are frequently present in the serum of patients with systemic rheumatic diseases, and have been reported to be associated with HLA-DR and -DQ genes. To better define the role of HLA genes in the production of such antibodies, we studied immunogenetic associations with autoantibodies reacting with U1 RNP, U1A and SmD1 proteins, and synthetic peptides containing immunodominant linear epitopes of these proteins. Only two out of the 15 overlapping peptides of U1A (i.e. peptides 35-58 and 257-282) and three of 11 peptides of SmD1 (i.e. peptides 1-20, 44-67 and 97-119) were significantly recognized by patients' sera selected on the basis of their antibody positivity with RNP in immunodiffusion. The distribution of DRB1, DQB1 and DPB1 alleles among the anti-RNP antibody-positive patients (n = 28) and healthy control subjects was similar. Antibodies against U1A (tested in Western immunoblotting with HeLa cell extracts) were positively associated to DRB1*06 allele; antibodies reacting with SmD1 peptide 44-67 were negatively associated to DRB1*02 and DQB1*0602 alleles. No association was found between DPB1 alleles and antibodies reacting with U1A and SmD1 antigens. This first study reporting an association between autoantibodies reacting with U1A and SmD1 proteins (and peptides of these proteins), and immunogenetic markers suggest that the production of antibody subsets directed against different components (or regions of these proteins) bound to the same snRNP particle is associated with distinct MHC class II alleles.
1998
Hoet R M, Raats J M, de Wildt R, Dumortier H, Muller S, van den Hoogen F, van Venrooij W J
Dans: Molecular Immunology, vol. 35, no. 16, p. 1045–1055, 1998, ISSN: 0161-5890.
Résumé | Liens | BibTeX | Étiquettes: Amino Acid Sequence, Antibodies, Autoantibodies, Cross Reactions, Dumortier, Epitope Mapping, Genes, HeLa Cells, Humans, I2CT, Immunoglobulin, Immunoglobulin Fragments, Immunoglobulin Variable Region, Immunohistochemistry, Lupus Erythematosus, Monoclonal, Ribonucleoprotein, Ribonucleoproteins, Small Nuclear, Systemic, Team-Dumortier, U1 Small Nuclear
@article{hoet_human_1998,
title = {Human monoclonal autoantibody fragments from combinatorial antibody libraries directed to the U1snRNP associated U1C protein; epitope mapping, immunolocalization and V-gene usage},
author = {R M Hoet and J M Raats and R de Wildt and H Dumortier and S Muller and F van den Hoogen and W J van Venrooij},
doi = {10.1016/s0161-5890(98)00093-5},
issn = {0161-5890},
year = {1998},
date = {1998-11-01},
journal = {Molecular Immunology},
volume = {35},
number = {16},
pages = {1045--1055},
abstract = {To study the localization and function of the U1snRNP associated U1C protein, so far only human sera from systemic lupus erythematosus (SLE) overlap syndrome patients have been used. Here we report for the first time the isolation of human monoclonal anti-UIC autoantibody fragments from IgG derived combinatorial and semi-synthetic human antibody libraries. Two classes of human monoclonal anti-UIC (auto)antibodies were found: specific anti-U1C autoantibodies, recognizing U1C only, and cross-reactive antibodies which also react with U1A and Sm-B/B'proteins. The heavy chains (V(H)genes) of all five antibodies from the semi-synthetic libraries and two of the three U1C-specific patient derived autoantibody fragments are encoded by V(H)3 genes, in which V(H) 3-30 (DP-49) was overrepresented. The heavy chain of the two cross-reactive autoantibodies are derived from the 3-07 (DP-54) gene. Three epitope regions on the U1C protein are targeted by these antibodies. (1) Four U1C specific antibodies recognize an N-terminal region of U1C in which amino acids 30-63 are essential for recognition, (2) two antibodies recognize only the complete U1C protein, and (3) two cross-reactive and one U1C specific antibody recognize the C-terminal domain in which amino acids 98-126 are critical for recognition. The two cross-reactive antibodies (K 11 and K 15) recognize the proline-rich region of the U1C protein (amino acids 98 126) and cross-react with proline-rich regions in Sm-B/B' (amino acids 163-184) and U1A (amino acids 187-204). All 10 antibody fragments are able to immunoprecipitate the native U1snRNP particle. The two cross-reactive antibodies immunoprecipitate the other Sm containing snRNPs as well. Using confocal immunofluorescence microscopy we could show that the major part of the U1C protein is localized within the coiled body structure.},
keywords = {Amino Acid Sequence, Antibodies, Autoantibodies, Cross Reactions, Dumortier, Epitope Mapping, Genes, HeLa Cells, Humans, I2CT, Immunoglobulin, Immunoglobulin Fragments, Immunoglobulin Variable Region, Immunohistochemistry, Lupus Erythematosus, Monoclonal, Ribonucleoprotein, Ribonucleoproteins, Small Nuclear, Systemic, Team-Dumortier, U1 Small Nuclear},
pubstate = {published},
tppubtype = {article}
}
To study the localization and function of the U1snRNP associated U1C protein, so far only human sera from systemic lupus erythematosus (SLE) overlap syndrome patients have been used. Here we report for the first time the isolation of human monoclonal anti-UIC autoantibody fragments from IgG derived combinatorial and semi-synthetic human antibody libraries. Two classes of human monoclonal anti-UIC (auto)antibodies were found: specific anti-U1C autoantibodies, recognizing U1C only, and cross-reactive antibodies which also react with U1A and Sm-B/B'proteins. The heavy chains (V(H)genes) of all five antibodies from the semi-synthetic libraries and two of the three U1C-specific patient derived autoantibody fragments are encoded by V(H)3 genes, in which V(H) 3-30 (DP-49) was overrepresented. The heavy chain of the two cross-reactive autoantibodies are derived from the 3-07 (DP-54) gene. Three epitope regions on the U1C protein are targeted by these antibodies. (1) Four U1C specific antibodies recognize an N-terminal region of U1C in which amino acids 30-63 are essential for recognition, (2) two antibodies recognize only the complete U1C protein, and (3) two cross-reactive and one U1C specific antibody recognize the C-terminal domain in which amino acids 98-126 are critical for recognition. The two cross-reactive antibodies (K 11 and K 15) recognize the proline-rich region of the U1C protein (amino acids 98 126) and cross-react with proline-rich regions in Sm-B/B' (amino acids 163-184) and U1A (amino acids 187-204). All 10 antibody fragments are able to immunoprecipitate the native U1snRNP particle. The two cross-reactive antibodies immunoprecipitate the other Sm containing snRNPs as well. Using confocal immunofluorescence microscopy we could show that the major part of the U1C protein is localized within the coiled body structure.
Ferrandon Dominique, Jung Alain C, Criqui M, Lemaitre Bruno, Uttenweiler-Joseph S, Michaut Lydia, Reichhart Jean-Marc, Hoffmann Jules A
A drosomycin-GFP reporter transgene reveals a local immune response in Drosophila that is not dependent on the Toll pathway Article de journal
Dans: EMBO J., vol. 17, no. 5, p. 1217–1227, 1998, ISSN: 0261-4189.
Résumé | Liens | BibTeX | Étiquettes: Animals, bacteria, Cell Surface, Developmental, Digestive System, Epithelium, Fat Body, Female, ferrandon, Fungal, Gene Expression Regulation, Genes, Green Fluorescent Proteins, hoffmann, Insect Proteins, Larva, Luminescent Proteins, M3i, Male, Membrane Glycoproteins, Organ Specificity, Receptors, reichhart, Reporter, Respiratory System, Spores, Toll-Like Receptors, Trachea, Transgenes
@article{ferrandon_drosomycin-gfp_1998,
title = {A drosomycin-GFP reporter transgene reveals a local immune response in Drosophila that is not dependent on the Toll pathway},
author = {Dominique Ferrandon and Alain C Jung and M Criqui and Bruno Lemaitre and S Uttenweiler-Joseph and Lydia Michaut and Jean-Marc Reichhart and Jules A Hoffmann},
doi = {10.1093/emboj/17.5.1217},
issn = {0261-4189},
year = {1998},
date = {1998-08-01},
journal = {EMBO J.},
volume = {17},
number = {5},
pages = {1217--1227},
abstract = {A hallmark of the systemic antimicrobial response of Drosophila is the synthesis by the fat body of several antimicrobial peptides which are released into the hemolymph in response to a septic injury. One of these peptides, drosomycin, is active primarily against fungi. Using a drosomycin-green fluorescent protein (GFP) reporter gene, we now show that in addition to the fat body, a variety of epithelial tissues that are in direct contact with the external environment, including those of the respiratory, digestive and reproductive tracts, can express the antifungal peptide, suggesting a local response to infections affecting these barrier tissues. As is the case for vertebrate epithelia, insect epithelia appear to be more than passive physical barriers and are likely to constitute an active component of innate immunity. We also show that, in contrast to the systemic antifungal response, this local immune response is independent of the Toll pathway.},
keywords = {Animals, bacteria, Cell Surface, Developmental, Digestive System, Epithelium, Fat Body, Female, ferrandon, Fungal, Gene Expression Regulation, Genes, Green Fluorescent Proteins, hoffmann, Insect Proteins, Larva, Luminescent Proteins, M3i, Male, Membrane Glycoproteins, Organ Specificity, Receptors, reichhart, Reporter, Respiratory System, Spores, Toll-Like Receptors, Trachea, Transgenes},
pubstate = {published},
tppubtype = {article}
}
A hallmark of the systemic antimicrobial response of Drosophila is the synthesis by the fat body of several antimicrobial peptides which are released into the hemolymph in response to a septic injury. One of these peptides, drosomycin, is active primarily against fungi. Using a drosomycin-green fluorescent protein (GFP) reporter gene, we now show that in addition to the fat body, a variety of epithelial tissues that are in direct contact with the external environment, including those of the respiratory, digestive and reproductive tracts, can express the antifungal peptide, suggesting a local response to infections affecting these barrier tissues. As is the case for vertebrate epithelia, insect epithelia appear to be more than passive physical barriers and are likely to constitute an active component of innate immunity. We also show that, in contrast to the systemic antifungal response, this local immune response is independent of the Toll pathway.
Levashina Elena A, Ohresser S, Lemaitre Bruno, Imler Jean-Luc
Two distinct pathways can control expression of the gene encoding the Drosophila antimicrobial peptide metchnikowin Article de journal
Dans: Journal of Molecular Biology, vol. 278, no. 3, p. 515–527, 1998