STA-21, un inhibidor prometedor de STAT3 que regula recíprocamente los linfocitos Th17 y Treg, inhibe la osteogénesis y alivia la inflamación autoinmune
STAT3 (signal transducer and activator of transcription 3) is the major transcription factor in the differentiation of Th17 cells, which along with IL-17 are significant in the development of RA. STA-21 is a new small molecule with significant inhibitory effects on STAT3, impeding DNA binding activity, dimerization and STAT3-dependent luciferase activity. While the effect of STA-21 in RA has not been fully determined, it has been hypothesised that STA-21 will suppress arthritis in animal models of RA. Park et al. used several measures, including in vivo testing in IL-1 receptor antagonist deficient mice, to show the therapeutic effect. The effects included the decreased activity of Th17 cells and increased Foxp3-expressing Treg cells. The effects on osteoclasts were also measured and an adoptive transfer of CD4+CD25+ T cells was performed to verify the Treg cells produced by STA-21 would work in vivo. The results obtained suggest that STA-21 presents a potential therapeutic option for RA.