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Differentiation of human naive CD4+T cells into Th17 cell phenotype
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Th17 cells are recently identified CD4+ T cell subset and best defined as their secretion of IL17, an inflammatory cytokine, and their role in host defense and autoimmunity. Further information on Th17 cell subset is strongly correlated with the differentiation and maintenance of these cells in culture. Although the master regulators and culture conditions in mouse Th17 differentiation are defined, the requirements and maintenance of human Th17 cell cultures remain unclear. Here, we suggest a new culture condition that maximizes IL17 expression and gives minimum IL17+IFNg+ and IL17+Foxp3+ among human studies. Our data define the doses and combinations of various cytokines that rise IL17 expression, as well as regulatory molecules in human Th17 cell differentiation. Various combinations of cytokines reveal that IL1Î² is the most important cytokine that primes Th17 differentiation. Also it was observed that TGFÎ² positively regulates Th17 differentiation in a dose-dependent manner by inhibiting IFNÎ³ expression thus represses Th1 differentiation and impairs Treg polarization at transcription factor state by tightly regulating Foxp3. Although it was suggested that Th17 cells must express RORC2, the master regulator, a minor cell population that expresses IL17, but does not co-express RORC2 was observed.