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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Modulation of AT-1R/MAPK cascade by an olmesartan treatment attenuates diabetic nephropathy in streptozotocin-induced diabetic mice.
Molecular and Cellular Endocrinology 2012 January 3
There is increasing evidence that angiotensin (Ang)-II plays an unprecedented role in diabetic complications. It could also be an important therapeutic target for ameliorating various diseases, especially diabetic nephropathy (DN). We therefore studied the beneficial effects of olmesartan, an Ang-II type 1 receptor (AT-1R) blocker in streptozotocin (150 mg/kg, BW)-induced diabetic kidney disease in mice. The diabetic kidney mice displayed upregulated protein expression levels of AT-1R, AT-2R, ERK-1/2, p-p38 MAPK, p-MAPKAPK-2, ET-1, p-JNK, p-c-Jun, TGF-β1, and gp91-phox, and all of these effects were expectedly downregulated by an olmesartan treatment. Also, immunohistochemical analysis, and Azan-Mallory and HE staining were performed to examine the expression of collagen-III and fibronectin, renal fibrosis, and hypertrophy, respectively. Furthermore, olmesartan treatment significantly abrogated the downregulation of ACE-2 and Ang-(1-7) mas R protein expression in diabetic kidney mice. Considering all these findings together, the AT-1R/MAPK pathway might be a potential therapeutic target in diabetes kidney disease, and olmesartan treatment could have beneficial effects on DN by modulating the AT-1R/MAPK pathway.
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