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Learn MoreProtein Arginine Methyltransferase (PRMT) 5 catalyzes symmetric dimethylation of arginine, a post-translational modification involved in cancer and embryonic development. However, the role and mechanisms by which PRMT5 modulates T helper (Th) cell polarization and autoimmune disease have not yet been elucidated. Here we find that PRMT5 promotes expression of cholesterol biosynthetic pathway enzymes that produce ROR agonists and activate ROR-t, driving Th17 differentiation. Specific loss of PRMT5 in the CD4 Th cell compartment completely protected mice from EAE. We also find that PRMT5 controls thymic and peripheral homeostasis in the CD4 Th cell life cycle, as well as iNK T and CD8 T cell development or maintenance, respectively. This work conclusively demonstrates that PRMT5 expression in recently activated T cells is necessary for expression of a cholesterol biosynthesis metabolic gene expression program that generates ROR-t agonistic activity and promotes Th17 differentiation and EAE. These results point to Th PRMT5 and its downstream cholesterol biosynthesis pathway as promising therapeutic targets in Th17-mediated diseases. SOURCE: Mireia Guerau (mireia.guerau@osumc.edu) - The Ohio State University
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