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Am J Physiol Renal Physiol. 2013 Dec 1;305(11):F1555-62. doi: 10.1152/ajprenal.00157.2013. Epub 2013 Aug 14.

Combined losartan and nitro-oleic acid remarkably improves diabetic nephropathy in mice.

Author information

1
Univ. of Utah and Veteran Affairs Medical Center, Division of Nephrology and Hypertension, 30 N 1900 E, Rm. 4R312, Salt Lake City, UT 84132. tianxin.yang@hsc.utah.edu.

Abstract

Diabetic nephropathy (DN) is a leading cause of end-stage renal disease (ESRD). The inhibitors of renin-angiotensin-aldosterone system (RAAS) can alleviate some of the symptoms of DN but fail to stop the progression to ESRD. Our previous studies demonstrate renoprotective action of nitro-oleic acid (OA-NO2) in several rodent models of renal disease. Here we examined the therapeutic potential and the underlying mechanism of combination of losartan and OA-NO2 in db/db mice. OA-NO2 was infused at 5 mg·kg(-1)·day(-1) via osmotic minipump, and losartan was incorporated into diet at 10 mg·kg(-1)·day(-1), each administered alone or in combination for 2 wk. Diabetic db/db mice developed progressive albuminuria and glomerulosclerosis, accompanied by podocytes loss, increased indexes of renal fibrosis, oxidative stress, and inflammation. Treatment of the diabetic mice with OA-NO2 or losartan alone moderately ameliorated kidney injury; however, the combined treatment remarkably reduced albuminuria, restored glomerular filtration barrier structure, and attenuated glomerulosclerosis, accompanied with significant suppression of renal oxidative stress and inflammation. These data demonstrate that combination of losartan and OA-NO2 effectively reverses renal injury in DN.

KEYWORDS:

diabetic nephropathy; losartan; nitro-oleic acid; oxidative stress

PMID:
23946292
PMCID:
PMC3882366
DOI:
10.1152/ajprenal.00157.2013
[Indexed for MEDLINE]
Free PMC Article

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