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Journal Article
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[Helper T cell paradigm: Th17 and regulatory T cells involved in autoimmune inflammatory disorders, pathogen defense and allergic diseases].
The helper T cell paradigm, divided into two distinct subsets, Th1 and Th2 cells, characterized by distinct cytokine and functions, has been expanded to IL-17-producing Th17 cells. Th1 cells producing IFN-γ are involved in delayed-type hypersensitivity, effective in intracellular pathogens defense, while Th2 cells secrete IL-4, IL-5, IL-13 and IL-25 and has a central role in IgE production, eosinophilic inflammation, and the protection for helminthic parasite infection. Th17 cell lineages, expressing IL-17 family of cytokines and IL-23-mediated functions on T cells, plays a role in immune response to fungi and extracellular pathogens and autoimmune inflammatory disorders. Th17 cells are required the combination of IL-6 and TGF-β and the transcription factors, RORC2/RORgt (mice) and STAT3 for differentiation, and produce IL-17, IL-22, IL-17F, IL-21 and CCL20. FOXP3+ regulatory T (Treg) cells produce TGF-β and IL-10, which regulate effector T cells, and thus maintain peripheral tolerance. Four functionally unique CD4+ T cells, including the regulatory T (Treg) cells are now involved in the regulation of immune responses to pathogens, self-antigens and allergens. Any defect in the entire CD4+T cell population might results in human diseases. In this review, the biology of Th17 cells and Treg cells and their role in immune diseases are presented.
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