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- W2057484961 abstract "Telmisartan, an angiotensin II receptor type 1 blocker (ARB), was recently reported to promote lipolysis in mice by acting as a peroxisome proliferator-activated receptor (PPAR)-δ activator, although in clinical studies, it has also been recognized to activate PPAR-γ as a major cause of its pleiotropic actions. The aim of this study was to investigate whether telmisartan activates endogenous PPAR-δ and thereby exerts anti-fibrotic effects in human mesangial cells (HMC). Immunohistochemical analysis of human renal biopsy specimens revealed that PPAR-δ protein was detected in the HMC of glomeruli with moderately proliferative changes. In the HMC, both GW0742, an authentic PPAR-δ agonist, and telmisartan enhanced PPAR response element (PPRE)-luciferase activity dose dependently, and these increases were blunted by GSK0660, a specific PPAR-δ antagonist, but not by GW9662, a PPAR-γ antagonist. Telmisartan also upregulated the expression of PPAR-δ target genes related to fatty acid oxidation; that is, heart type-fatty acid-binding protein and uncoupling protein-2. These effects were inhibited by both PPAR-δ antagonism and PPAR-δ gene silencing. Transforming growth factor-β1 (TGF-β1) increased the expression of plasminogen activator inhibitor-1 (PAI-1), TGF-β1 and collagen IV. The PAI-1 expression was mediated, at least in part by the phosphorylation of extracellular signal-regulated kinases (ERKs). Telmisartan suppressed TGF-β1-stimulated PAI-1 and collagen IV expression and ERK phosphorylation, and these effects were weakened by PPAR-δ antagonism, whereas eprosartan, a non-PPAR activating ARB, did not affect TGF-β1-stimulated PAI-1 expression. These results indicate that in HMC telmisartan activates endogenous PPAR-δ and may prevent TGF-β1-induced fibrotic changes by reducing ERK phosphorylation in a PPAR-δ-dependent manner, and thus, might be useful for treating hypertensive patients with renal and metabolic disorders." @default.
- W2057484961 created "2016-06-24" @default.
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- W2057484961 date "2013-12-19" @default.
- W2057484961 modified "2023-10-11" @default.
- W2057484961 title "Telmisartan activates endogenous peroxisome proliferator-activated receptor-δ and may have anti-fibrotic effects in human mesangial cells" @default.
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- W2057484961 doi "https://doi.org/10.1038/hr.2013.157" @default.
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