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pubmed-article:20488955pubmed:abstractTextTGF-beta/Smad3 promotes renal fibrosis, but the mechanisms that regulate profibrotic genes remain unclear. We hypothesized that miR-192, a microRNA expressed in the kidney may mediate renal fibrosis in a Smad3-dependent manner. Microarray and real-time PCR demonstrated a tight association between upregulation of miR-192 in the fibrotic kidney and activation of TGF-beta/Smad signaling. Deletion of Smad7 promoted miR-192 expression and enhanced Smad signaling and fibrosis in obstructive kidney disease. In contrast, overexpression of Smad7 to block TGF-beta/Smad signaling inhibited miR-192 expression and renal fibrosis in the rat 5/6 nephrectomy model; in vitro, overexpression of Smad7 in tubular epithelial cells abolished TGF-beta1-induced miR-192 expression. Furthermore, Smad3 but not Smad2 mediated TGF-beta1-induced miR-192 expression by binding to the miR-192 promoter. Last, overexpression of a miR-192 mimic promoted and addition of a miR-192 inhibitor blocked TGF-beta1-induced collagen matrix expression. Taken together, miR-192 may be a critical downstream mediator of TGF-beta/Smad3 signaling in the development of renal fibrosis.lld:pubmed
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pubmed-article:20488955pubmed:authorpubmed-author:LanHui YHYlld:pubmed
pubmed-article:20488955pubmed:authorpubmed-author:HuangXiao RXRlld:pubmed
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pubmed-article:20488955pubmed:authorpubmed-author:MengXiaomingXlld:pubmed
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pubmed-article:20488955pubmed:articleTitlemiR-192 mediates TGF-beta/Smad3-driven renal fibrosis.lld:pubmed
pubmed-article:20488955pubmed:affiliationDepartment of Medicine and Therapeutics and Li Ka Shing Institute of Health Sciences, Chinese University of Hong Kong, Hong Kong, China.lld:pubmed
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