Sirt1 activation ameliorates renal fibrosis by inhibiting the TGF-β/Smad3 pathway

Journal of Cellular Biochemistry
Xin-Zhong HuangChuan-Ming Hao

Abstract

TGF-β signaling plays an important role in the pathogenesis and progression of chronic kidney disease (CKD). Smad3, a transcription factor, is a critical fibrogenic mediator of TGF-β. Sirt1 is a NAD(+) -dependent deacetylase that has been reported to modify a number of transcription factors to exert certain beneficial health effects. This study examined the effect of Sirt1 on Smad3 and its role in CKD. Resveratrol attenuated the expression of extracelluar matrix proteins in both the remnant kidney of 5/6th nephrectomized rats and cultured mesangial cells (MMCs) exposed to TGF-β1. The effect of resveratrol was substantially attenuated in cultured MMCs for which Sirt1 had been knocked down by an shRNA lentivirus. Overexpression of Sirt1 attenuated TGF-β1-induced extracelluar matrix expression in cultured cells. Co-immunoprecipitation studies suggested that Sirt1 could bind with Smad3. Resveratrol treatment enhanced this binding and reduced acetylation levels of Smad3. Resveratrol inhibited the transcription activity of Smad3. Knockdown of Sirt1 increased acetylated Smad3 and substantially enhanced the transcriptional activity following TGF-β1. Finally, Sirt1 deficiency aggravated renal function damage and markedly enhanced fibros...Continue Reading

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