SIS3 HCl

Description: SIS3 HCl is a potent and selective inhibitor of Smad3 which is a receptor-regulated intracellular protein that functions downstream of TGF-β and activin receptors and mediates their signaling, playing a role in cell proliferation, differentiation, apoptosis and formation of extracellular matrix. SIS3 can block excessive ECM production from the TGF-β1-treated normal fibroblasts and scleroderma fibroblasts, the model of cells with autocrine TGF-β signaling in vitro. Addition of SIS3 attenuates the effects of TGF-β1 by reducing the transcriptional activity. SIS3 also inhibits the myofibroblast differentiation of fibroblasts by TGF-β1.