TGFB1 and rheumatoid arthritis: In contrast, IL-6 inhibits TGF-β-induced Treg differentiation (73) contributing to the dysbalance between Th17/Treg described in several T cell mediated autoimmune diseases (74–76) such as psoriasis, rheumatoid arthritis (RA), and inflammatory bowel diseases (IBD) (75–77).