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<dc:title xml:lang="fr">Analyse du rôle du facteur de transcription Ikaros dans le développement des lymphocytes TH17</dc:title>
<dcterms:alternative xml:lang="en">Analysis of the role of the transcription factor Ikaros in the development of TH17 cells</dcterms:alternative>
<dc:subject xml:lang="fr">Facteur de transcription</dc:subject>
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<dc:subject xml:lang="fr">RORɣt</dc:subject>
<dc:subject xml:lang="fr">Cellules TH17</dc:subject>
<dc:subject xml:lang="fr">Gènes pathogéniques</dc:subject>
<dc:subject xml:lang="en">Transcription factor</dc:subject>
<dc:subject xml:lang="en">Ikaros</dc:subject>
<dc:subject xml:lang="en">RORƔt</dc:subject>
<dc:subject xml:lang="en">TH17 cells</dc:subject>
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<tef:elementdEntree autoriteExterne="114605890" autoriteSource="Sudoc.FMesh">Facteur de transcription Ikaros</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Les cellules T auxiliaires TH17 sont caractérisées par l’expression de la cytokine IL-17A, ainsi que le facteur de transcription RORɣt. Elles sont connues pour jouer un rôle clé dans la pathogenèse de la sclérose en plaques. Ces cellules existent sous deux formes : les cellules régulatrices, immunomodulatrices, et les cellules pathogènes qui sont critiques pour l'inflammation. Il est donc important de comprendre le mécanisme qui sous-tend la différenciation des cellules TCD4+ naïves en ces deux types cellulaires. J'ai trouvé que le facteur de transcription Ikaros est un répresseur indirect de la transcription des gènes pathogéniques (Il3, Csf2, Ifng, Stat4…) dans les cellules TCD4+ naïves murines, cultivées pour induire une polarisation vers le phénotype TH17 régulateur. De plus, en absence d’Ikaros et en conditions de culture régulatrice, l’ajout d’IL-6 seul augmente l’expression de GM-CSF, facteur clé dans l’induction des maladies auto-immunes, suggérant un rôle d’Ikaros dans la régulation de cette voie. En conclusion, nos résultats suggèrent que Ikaros est nécessaire pour polariser correctement les cellules TCD4+ naïves dans le programme TH17.</dcterms:abstract>
<dcterms:abstract xml:lang="en">TH17 cells are characterized by the expression of the cytokine IL-17A, as well as the transcription factor RORɣt. They are known to play key role in the pathogenesis of the multiple sclerosis. These cells exist in two forms: the regulating cells, immunomodulatory, and the pathogenic cells which are critical for the inflammation. Thus it is important to understand the mechanism which underlies the differentiation of naïve CD4+ T cells in these two cellular types. I found that the transcription factor Ikaros is an indirect repressor of the transcription of pathogenic genes (Il3, Csf2, Ifng, Stat4…) in naïve CD4+ T cells, cultured to induce a polarization toward regulatory TH17 cells. Moreover, in absence of Ikaros and in regulatory condition of culture, adding IL-6 alone increases the expression of GM-CSF, key factor to induce auto-immune diseases, suggesting a role of Ikaros in this pathway. In conclusion, our results suggest that Ikaros is necessary to polarize correctly naïve CD4+ T cells in TH17 cells.</dcterms:abstract>
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