TGF-β/Smad3 Signaling Promotes Renal Fibrosis by Inhibiting MiR-29

Overview

Journal J Am Soc Nephrol

Specialty Nephrology

Date 2011 Jul 26

PMID 21784902

Citations 299

Authors

Wei Qin

Arthur C K Chung

Xiao R Huang

Xiao-Ming Meng

David S C Hui

Cheuk-Man Yu

Joseph J Y Sung

Hui Y Lan

Affiliations

Soon will be listed here.

Abstract

TGF-β/Smad3 signaling promotes fibrosis, but the development of therapeutic interventions involving this pathway will require the identification and ultimate targeting of downstream fibrosis-specific genes. In this study, using a microRNA microarray and real-time PCR, wild-type mice had reduced expression of miR-29 along with the development of progressive renal fibrosis in obstructive nephropathy. In contrast, Smad3 knockout mice had increased expression of miR-29 along with the absence of renal fibrosis in the same model of obstruction. In cultured fibroblasts and tubular epithelial cells, Smad3 mediated TGF-β(1)-induced downregulation of miR-29 by binding to the promoter of miR-29. Furthermore, miR-29 acted as a downstream inhibitor and therapeutic microRNA for TGF-β/Smad3-mediated fibrosis. In vitro, overexpression of miR-29b inhibited, but knockdown of miR-29 enhanced, TGF-β(1)-induced expression of collagens I and III by renal tubular cells. Ultrasound-mediated gene delivery of miR-29b either before or after established obstructive nephropathy blocked progressive renal fibrosis. In conclusion, miR-29 is a downstream inhibitor of TGF-β/Smad3-mediated fibrosis and may have therapeutic potential for diseases involving fibrosis.

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