In addition, transduction of miR-29b was able to inhibit the activation of Smad3 both in vitro and in vivo, an important player in fibrogenic pathway, which indicated that miR-29b is not only a downstream target of TGF-β/Smad3 in liver fibrogenesis, but also a negative feedback-regulator of the TGF-β/Smad3 signaling axis in the pathogenesis of liver fibrosis. The gene discussed is TGFB1; the disease is Hepatic fibrosis.