SIS3 free base is a potent and selective Smad3 phosphorylation inhibitor. SIS3 free base inhibits the myofibroblast differentiation of fibroblasts by TGF-β1.
ALK5-IN-8 is a highly effective inhibitor of TGFβRI (ALK5). It hinders the phosphorylation of ALK5 on downstream signaling proteins (Smad2 or Smad3) by obstructing the interaction between TGFβRI and ligands. Consequently, it disrupts or prevents TGF-β signaling. ALK5-IN-8 shows promise in the study of diverse diseases associated with ALK5-mediated pathways[1].
TGFβ-IN-2 (Compound 9d) effectively inhibits the accumulation of total collagen induced by TGF-β in NRK-49F cells, with an IC 50 value of 4.31 μM. It also suppresses the in vitro protein expression of COL1A1, α-SMA, and p-Smad3, which are induced by TGF-β. Additionally, TGFβ-IN-2 shows promise as a potential anti-fibrosis compound for in vivo applications through oral administration [1].