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• W2108806591 abstract "Connective tissue growth factor (CTGF) plays a critical role in angiotensin II (Ang II)–mediated hypertensive nephropathy. The present study investigated the mechanisms and specific roles of individual Smads in Ang II–induced CTGF and collagen I expression in tubular epithelial cells with deletion of transforming growth factor (TGF)-β1, overexpression of Smad7, or knockdown of Smad2 or Smad3. We found that Ang II–induced tubular CTGF and collagen I mRNA and protein expressions were regulated positively by phosphorylated Smad2/3 but negatively by Smad7 because overexpression of Smad7-abolished Ang II–induced Smad2/3 phosphorylation and upregulation of CTGF and collagen I in vitro and in a rat model of remnant kidney disease. Additional studies revealed that, in addition to a late (24-hour) TGF-β–dependent Smad2/3 activation, Ang II also induced a rapid activation of Smad2/3 at 15 minutes and expression of CTGF and collagen I in tubular epithelial cells lacking the TGF-β gene, which was blocked by the addition of an Ang II type 1 receptor antagonist (losartan) and inhibitors to extracellular signal–regulated kinase 1/2 (PD98059) and p38 (SB203580) but not by inhibitors to Ang II type 2 receptor (PD123319) or c-Jun N-terminal kinase (SP600125), demonstrating a TGF-β–independent, Ang II type 1 receptor–mediated extracellular signal–regulated kinase/p38 mitogen-activated protein kinase cross-talk pathway in Ang II–mediated CTGF and collagen I expression. Importantly, the ability of knockdown of Smad3, but not Smad2, to inhibit Ang II–induced CTGF and collagen I expression further revealed an essential role for Smad3 in Ang II–mediated renal fibrosis. In conclusion, Ang II induces tubular CTGF expression and renal fibrosis via the TGF-β–dependent and –independent Smad3 signaling pathways, suggesting that targeting Smad3 may have therapeutic potential for hypertensive nephropathy." @default.
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• W2108806591 date "2009-10-01" @default.
• W2108806591 modified "2023-10-16" @default.
• W2108806591 title "Angiotensin II Induces Connective Tissue Growth Factor and Collagen I Expression via Transforming Growth Factor–β–Dependent and –Independent Smad Pathways" @default.
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• W2108806591 doi "https://doi.org/10.1161/hypertensionaha.109.136531" @default.
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