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Book
Rôle de AHR sur la production d' IL-22 dans un modèle de psoriasis
Authors: --- ---
Year: 2015 Publisher: Bruxelles: UCL. Faculté de pharmacie et des sciences biomédicales,

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Abstract

IL-22 is' a cytokine produced in the inflamed skin. lt plays a deleterious role in cutaneous pathologies such as psoriasis while it has a protective role in guts and intestinal inflammatory diseases such as colitis. IL-22 is produced by different types of T lymphocytes as well as by innate lymphoid cells (ILC). ln vitro, it has been shown that IL-22 production by Th17 is dependent on the transcription factor AHR which is a cytosolic factor able to bind aryl hydrocarbons. The majority of IL-22 producing cells express this factor. Thereby, we wondered whether it was necessary for IL-22 production by every type of cells.ln this study, we focused on IL-22 production by skin cells.To induce IL-22 production by skin cells, we used a psoriasis mode! based on topical application of imiquimod on ears. The role of AHR in this model was studied by treating Ahr-deficient mice (Ahr l-) and wild-type (WT) mice. If Ahrl- mice have a reduced production of IL-22, we hypothesized that these mice should be protected against imiquimod treatment because IL-22 plays a deleterious role in this model.lndeed, after imiquimod treatment, Ahrl- mice display an acanthosis less important compared to wild-type mice. Deleterious role of this factor is also observed in mice deficient in T and B lymphocytes . We show that this reduced acanthosis is associated with a decrease of IL-22 expression in total skin. However, Ahr-deficient mice are still able to produce IL-22, demonstrating that AHR is not absolutely needed for IL-22 production. Analyzing IL-22 producing cell populations, we show that only Th17 require AHR to express IL-22 while other populations of T lymphocytes or innate cells are still able to produce IL-22 in the absence of AHR. Finally, our results show that AHR would act on proliferation and/or recruitment of IL- 22 producing cells in skin because we observe a diminution of the number of T lymphocytes and innate lymphoid cells in Ahrl- skin.To conclude, AHR seems to have pro-inflammatory roles in skin and its direct effect on IL-22 production seems to be limited to Thl7.de l'immunité innée appelées ILCs. ln vitro, il a été démontré que le mécanisme de production de l'IL-22 par les Th17 in vitro dépendait du facteur de transcription AHR qui est un récepteur cytosolique capable de fixer des aryls hydrocarbures. Ce facteur de transcription étant exprimé par les cellules produisant l'IL-22, nous nous sommes demandé si,de manière générale, il était nécessaire à la production d'IL-22 par toutes les cellules.Au cours de ce travail, nous nous sommes focalisés sur la production d'IL-22 par les cellules de la peau. Afin d'induire l'express ion de cette cytokine au niveau cutané, nous avons utilisé un modèle de psoriasis basé sur l'application d'imiquimod . Le rôle de AHR dans ce modèle a été étudié en traitant des souris déficientes en AHR (Ah( 1-) ainsi que des souris sauvages. Si les souris Ahr-J.présentent un déficit au niveau de la production d'IL-22,nous devr ions observer une protection de ces souris suite au traitement à l'imiquimod car l'IL-22 y joue un rôle délétère.Effectivement, après traitement à l'imiquimod, les souris Ah(1-présentent une acanthose moins importante que leurs homologues sauvages. Le rôle délétère de ce facteur est également observé dans des souris déficientes en lymphocytes T et B. Nous montrons que cette diminution d'acanthose est associée à une réduction de l'expression de l'IL-22 dans la peau totale. Cependant, les souris déficientes en Ahr sont toujours capables de produire de l'IL-22,ce qui démontre que ce facteur n'est pas absolument nécessaire à la production d'IL-22. En analysant les différentes cellules produisant l'IL-22 dans la peau, nous montrons que seuls les Th17 requièrent AHR pour exprimer l'IL-22 alors que d'autres populations de lymphocytes T ou des cellules de l'immunité innée sont toujours capables de produire de l'IL-22 en l'absence d'AHR. Nos résultats montrent également que AHR agirait plutôt sur la prolifération et/ou le recrutement des cellules produisant l'IL-22 au niveau de la peau car nous observons une diminution du nombre de lymphocytes T et d'ILCs dans la peau de souris.En conclusion, AHR semble avoir des effets pro-inflammatoires dans la peau et son implication directe dans la production d'IL-22 semble être limitée aux Th17. L'IL-22 est une cytokine produite dans la peau lors d'une inflammation. Elle joue un rôle délétère dans certaines maladies cutanées telles que le psoriasis alors qu'elle a un effet protecteur dans l'intestin et dans des maladies inflammatoires comme la colite. L'IL-22 peut être produite par différents types de lymphocytes T ainsi que par des cellules de l'immunité innée appelées ILCs. ln vitro, il a été démontré que le mécanisme de production de l'IL-22 par les Th17 in vitro dépendait du facteur de transcription AHR qui est un récepteur cytosolique capable de fixer des aryls hydrocarbures. Ce facteur de transcription étant expr imé par les cellules produisant l'IL-22, nous nous sommes demandé si,de manière générale, il était nécessaire à la production d'IL-22 par toutes les cellules.Au cours de ce travail, nous nous sommes focalisés sur la production d'IL-22 par les cellules de la peau. Afin d'induire l'express ion de cette cytokine au niveau cutané, nous avons utilisé un modèle de psoriasis basé sur l'application d'imiquimod . Le rôle de AHR dans ce modèle a été étudié en traitant des souris déficientes en AHR (Ah( 1-) ainsi que des souris sauvages. Si les souris Ahr-J.présentent un déficit au niveau de la production d'IL-22,nous devr ions observer une protection de ces souris suite au traitement à l'imiquimod car l'IL-22 y joue un rôle délétère.Effectivement, après traitement à l'imiquimod, les souris Ah(1-présentent une acanthose moins importante que leurs homologues sauvages. Le rôle délétère de ce facteur est également observé dans des souris déficientes en lymphocytes T et B. Nous montrons que cette diminution d'acanthose est associée à une réduction de l'expression de l'IL-22 dans la peau totale. Cependant, les souris déficientes en Ahr sont toujours capables de produire de l'IL-22,ce qui démontre que ce facteur n'est pas absolument nécessaire à la production d'IL-22. En analysant les différentes cellules produisant l'IL-22 dans la peau, nous montrons que seuls les Th17 requièrent AHR pour exprimer l'IL-22 alors que d'autres populations de lymphocytes T ou des cellules de l'immunité innée sont toujours capables de produire de l'IL-22 en l'absence d'AHR. Nos résultats montrent également que AHR agirait plutôt sur la prolifération et/ou le recrutement des cellules produisant l'IL-22 au niveau de la peau car nous observons une diminution du nombre de lymphocytes T et d'ILCs dans la peau de souris AhLR-.En conclusion, AHR semble avoir des effets pro-inflammatoires dans la peau et son implication directe dans la production d'IL-22 semble être limitée aux Th17.


Periodical
Nuclear receptor.
ISSN: 14781336 Year: 2003 Publisher: [London] : BioMed Central,

Nuclear Receptors.
Authors: --- ---
ISSN: 00766879 ISBN: 0121822672 9786611011369 1281011363 0080497071 9780121822675 Year: 2003 Volume: 364 Publisher: Burlington : Elsevier Science,

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Abstract

Nuclear Receptors are inducible transcription factors that mediate complex effects on development, differentiation and homeostasis. They regulate the transcription of their target genes through binding to DNA sequences.*Analysis of Nuclear Receptor Ligands*Structure/Function Analysis of Nuclear Receptors*Analysis of Nuclear Receptor Co-Factors and Chromatin Remodeling

Keywords

Nuclear receptors (Biochemistry). --- Laboratory Chemicals --- Proteins --- DNA-Binding Proteins --- Investigative Techniques --- Transcription Factors --- Biochemical Phenomena --- Pharmacological Phenomena --- Physiological Phenomena --- Analytical, Diagnostic and Therapeutic Techniques and Equipment --- Amino Acids, Peptides, and Proteins --- Specialty Uses of Chemicals --- Chemical Phenomena --- Phenomena and Processes --- Chemical Actions and Uses --- Chemicals and Drugs --- Receptors, Cytoplasmic and Nuclear --- Structure-Activity Relationship --- Models, Animal --- Ligands --- Human Anatomy & Physiology --- Health & Biological Sciences --- Animal Biochemistry --- Experimental Animal Models --- Laboratory Animal Models --- Animal Model --- Animal Model, Experimental --- Animal Model, Laboratory --- Animal Models --- Animal Models, Experimental --- Animal Models, Laboratory --- Experimental Animal Model --- Laboratory Animal Model --- Model, Animal --- Model, Experimental Animal --- Model, Laboratory Animal --- Models, Experimental Animal --- Models, Laboratory Animal --- Animal Experimentation --- Relationship, Structure-Activity --- Relationships, Structure-Activity --- Structure Activity Relationship --- Structure-Activity Relationships --- Cytoplasmic Hormone Receptors --- Cytoplasmic Receptors --- Cytosol and Nuclear Receptors --- Intracellular Membrane Receptors --- Nuclear Hormone Receptors --- Nuclear Receptors --- Receptors, Cytoplasmic --- Receptors, Cytosol and Nuclear --- Receptors, Cytosolic and Nuclear --- Receptors, Intracellular Membrane --- Receptors, Nuclear --- Receptors, Nuclear and Cytoplasmic --- Cytoplasmic and Nuclear Receptors --- Cytosolic and Nuclear Receptors --- Hormone Receptors, Cytoplasmic --- Hormone Receptors, Nuclear --- Nuclear and Cytoplasmic Receptors --- Membrane Receptors, Intracellular --- Receptors, Cytoplasmic Hormone --- Receptors, Nuclear Hormone --- Hormones --- Chemical Phenomenon --- Chemical Process --- Physical Chemistry Phenomena --- Physical Chemistry Process --- Physicochemical Phenomenon --- Physicochemical Process --- Chemical Concepts --- Chemical Processes --- Physical Chemistry Concepts --- Physical Chemistry Processes --- Physicochemical Concepts --- Physicochemical Phenomena --- Physicochemical Processes --- Chemical Concept --- Chemistry Process, Physical --- Chemistry Processes, Physical --- Concept, Chemical --- Concept, Physical Chemistry --- Concept, Physicochemical --- Concepts, Chemical --- Concepts, Physical Chemistry --- Concepts, Physicochemical --- Phenomena, Chemical --- Phenomena, Physical Chemistry --- Phenomena, Physicochemical --- Phenomenon, Chemical --- Phenomenon, Physicochemical --- Physical Chemistry Concept --- Physicochemical Concept --- Process, Chemical --- Process, Physical Chemistry --- Process, Physicochemical --- Processes, Chemical --- Processes, Physical Chemistry --- Processes, Physicochemical --- Specialty Chemicals and Products --- Physiological Concepts --- Physiological Phenomenon --- Physiological Process --- Physiological Processes --- Concept, Physiological --- Concepts, Physiological --- Phenomena, Physiological --- Phenomenas, Physiological --- Phenomenon, Physiological --- Physiological Concept --- Process, Physiological --- Processes, Physiological --- Pharmacologic Phenomena --- Pharmacologic Phenomenon --- Pharmacologic Process --- Pharmacological Concepts --- Pharmacological Phenomenon --- Pharmacologic Processes --- Pharmacological Processes --- Concept, Pharmacological --- Concepts, Pharmacological --- Pharmacological Concept --- Phenomena, Pharmacologic --- Phenomena, Pharmacological --- Phenomenon, Pharmacologic --- Phenomenon, Pharmacological --- Process, Pharmacologic --- Processes, Pharmacologic --- Processes, Pharmacological --- Biochemical Concepts --- Biochemical Phenomenon --- Biochemical Process --- Phenomena, Biochemical --- Biochemical Processes --- Biochemical Concept --- Concept, Biochemical --- Concepts, Biochemical --- Phenomenon, Biochemical --- Process, Biochemical --- Processes, Biochemical --- Molecular Biology --- Transcription Factor --- Factor, Transcription --- Factors, Transcription --- Gene Expression Regulation --- Transcription, Genetic --- Investigative Technics --- Investigative Technic --- Investigative Technique --- Technic, Investigative --- Technics, Investigative --- Technique, Investigative --- Techniques, Investigative --- DNA Binding Protein --- DNA Single-Stranded Binding Protein --- SS DNA BP --- Single-Stranded DNA-Binding Protein --- DNA Helix Destabilizing Proteins --- Single-Stranded DNA Binding Proteins --- Binding Protein, DNA --- DNA Binding Proteins --- DNA Single Stranded Binding Protein --- DNA-Binding Protein, Single-Stranded --- Single Stranded DNA Binding Protein --- Single Stranded DNA Binding Proteins --- Gene Products, Protein --- Gene Proteins --- Protein Gene Products --- Proteins, Gene --- Molecular Mechanisms of Pharmacological Action --- Chemicals, Laboratory --- Ligand --- Cytoplasmic Receptor --- Nuclear Hormone Receptor --- Nuclear Receptor --- Hormone Receptor, Nuclear --- Receptor, Cytoplasmic --- Receptor, Nuclear --- Receptor, Nuclear Hormone --- DNA-Binding Protein --- Protein, DNA-Binding --- Protein

Nuclear Receptors Coregulators and Human Diseases
Authors: ---
ISBN: 1281968277 9812819177 9789812819178 9789812705365 9812705368 9789812705372 9812705376 9786611968274 Year: 2008 Publisher: River Edge : World Scientific Publishing Company,

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Abstract

This book serves as a treasure for all those who have an interest in nuclear receptor coregulators and human diseases. Written by experts in the field, each chapter provides comprehensive, up-to-date information on the physiologic and pathologic roles of coregulators in specific organ systems, giving biomedical students; basic and clinical researchers; and educators in diverse sub-specialties a thorough summary of the overall subject. Readers will be able to understand the important current information and views on specific coactivators and corepressors and their roles in the pathogenesis of

Keywords

Nuclear receptors (Biochemistry). --- Pathology, Molecular. --- Pathology, Molecular --- Nuclear receptors (Biochemistry) --- Proteins --- Genetic Processes --- Biochemical Processes --- Cell Physiological Processes --- Gene Expression --- DNA-Binding Proteins --- Amino Acids, Peptides, and Proteins --- Biochemical Phenomena --- Chemical Processes --- Cell Physiological Phenomena --- Genetic Phenomena --- Phenomena and Processes --- Chemicals and Drugs --- Chemical Phenomena --- Signal Transduction --- Transcription, Genetic --- Gene Expression Regulation --- Transcription Factors --- Receptors, Cytoplasmic and Nuclear --- Medicine --- Biology --- Health & Biological Sciences --- Cytology --- Pathology --- Cytoplasmic Hormone Receptors --- Cytoplasmic Receptors --- Cytosol and Nuclear Receptors --- Intracellular Membrane Receptors --- Nuclear Hormone Receptors --- Nuclear Receptors --- Receptors, Cytoplasmic --- Receptors, Cytosol and Nuclear --- Receptors, Cytosolic and Nuclear --- Receptors, Intracellular Membrane --- Receptors, Nuclear --- Receptors, Nuclear and Cytoplasmic --- Cytoplasmic Receptor --- Cytoplasmic and Nuclear Receptors --- Cytosolic and Nuclear Receptors --- Hormone Receptors, Cytoplasmic --- Hormone Receptors, Nuclear --- Nuclear Hormone Receptor --- Nuclear Receptor --- Nuclear and Cytoplasmic Receptors --- Hormone Receptor, Nuclear --- Membrane Receptors, Intracellular --- Receptor, Cytoplasmic --- Receptor, Nuclear --- Receptor, Nuclear Hormone --- Receptors, Cytoplasmic Hormone --- Receptors, Nuclear Hormone --- Hormones --- Transcription Factor --- Factor, Transcription --- Factors, Transcription --- Expression Regulation, Gene --- Regulation, Gene Action --- Regulation, Gene Expression --- Gene Action Regulation --- Regulation of Gene Expression --- RNAi Therapeutics --- Gene Regulatory Networks --- Genetic Transcription --- DNA, Ribosomal --- Antisense Elements (Genetics) --- Receptor Mediated Signal Transduction --- Signal Transduction Pathways --- Signal Transduction Systems --- Cell Signaling --- Receptor-Mediated Signal Transduction --- Signal Pathways --- Pathway, Signal --- Pathway, Signal Transduction --- Pathways, Signal --- Pathways, Signal Transduction --- Receptor-Mediated Signal Transductions --- Signal Pathway --- Signal Transduction Pathway --- Signal Transduction System --- Signal Transduction, Receptor-Mediated --- Signal Transductions --- Signal Transductions, Receptor-Mediated --- System, Signal Transduction --- Systems, Signal Transduction --- Transduction, Signal --- Transductions, Signal --- Cell Communication --- Receptor-CD3 Complex, Antigen, T-Cell --- Receptor Cross-Talk --- Feedback, Physiological --- Gasotransmitters --- Chemical Phenomenon --- Chemical Process --- Physical Chemistry Phenomena --- Physical Chemistry Process --- Physicochemical Phenomenon --- Physicochemical Process --- Chemical Concepts --- Physical Chemistry Concepts --- Physical Chemistry Processes --- Physicochemical Concepts --- Physicochemical Phenomena --- Physicochemical Processes --- Chemical Concept --- Chemistry Process, Physical --- Chemistry Processes, Physical --- Concept, Chemical --- Concept, Physical Chemistry --- Concept, Physicochemical --- Concepts, Chemical --- Concepts, Physical Chemistry --- Concepts, Physicochemical --- Phenomena, Chemical --- Phenomena, Physical Chemistry --- Phenomena, Physicochemical --- Phenomenon, Chemical --- Phenomenon, Physicochemical --- Physical Chemistry Concept --- Physicochemical Concept --- Process, Chemical --- Process, Physical Chemistry --- Process, Physicochemical --- Processes, Chemical --- Processes, Physical Chemistry --- Processes, Physicochemical --- DNA Binding Protein --- DNA Single-Stranded Binding Protein --- SS DNA BP --- Single-Stranded DNA-Binding Protein --- DNA Helix Destabilizing Proteins --- DNA-Binding Protein --- Single-Stranded DNA Binding Proteins --- Binding Protein, DNA --- DNA Binding Proteins --- DNA Single Stranded Binding Protein --- DNA-Binding Protein, Single-Stranded --- Protein, DNA-Binding --- Single Stranded DNA Binding Protein --- Single Stranded DNA Binding Proteins --- Expression, Gene --- Expressions, Gene --- Gene Expressions --- Gene Expression Profiling --- Cell Physiological Phenomenon --- Cell Physiological Process --- Physiology, Cell --- Cell Physiology --- Phenomena, Cell Physiological --- Phenomenon, Cell Physiological --- Physiological Process, Cell --- Physiological Processes, Cell --- Process, Cell Physiological --- Processes, Cell Physiological --- Cells --- Biochemical Concepts --- Biochemical Phenomenon --- Biochemical Process --- Phenomena, Biochemical --- Biochemical Concept --- Concept, Biochemical --- Concepts, Biochemical --- Phenomenon, Biochemical --- Process, Biochemical --- Processes, Biochemical --- Molecular Biology --- Genetic Concepts --- Genetic Phenomenon --- Genetic Process --- Concept, Genetic --- Concepts, Genetic --- Genetic Concept --- Phenomena, Genetic --- Phenomenon, Genetic --- Process, Genetic --- Processes, Genetic --- Gene Products, Protein --- Gene Proteins --- Protein --- Protein Gene Products --- Proteins, Gene --- Molecular Mechanisms of Pharmacological Action --- Nuclear hormone receptors --- Receptors, Nuclear (Biochemistry) --- Receptors, Nuclear hormone --- Hormone receptors --- Transcription factors --- Molecular pathology --- Molecular biology --- Physiology, Pathological --- physiology --- Transcription, Genetic. --- Transcription Factors. --- Genetic Expression Regulation. --- physiology. --- genetics.

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