Olmesartan protects against oxidative stress possibly through the Nrf2 signaling pathway and inhibits inflammation in daunorubicin-induced nephrotoxicity in rats

Vengadeshprabhu Karuppa Gounder, Somasundaram Arumugam, Wawaimuli Arozal, Rajarajan A. Thandavarayan, Vigneshwaran Pitchaimani, Meilei Harima, Kenji Suzuki, Mayumi Nomoto, Kenichi Watanabe

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

Anthracycline anticancer drug daunorubicin (DNR) can induce chronic nephrotoxicity, which is believed to be based on oxidative injury. Olmesartan has significant blood pressure lowering effect via modulating renin-angiotensin system although its mechanism of action in DNR-induced renal injury is largely unknown. Transcription factor nuclear factor-erythroid 2-related factor 2 (Nrf2) is an important regulator of cellular oxidative stress. This study examined the role of Nrf2 in olmesartan-mediated antioxidant effects in DNR induced kidney cells. In addition, key factors involved in promoting inflammation and oxidative stress were studied. Sprague-Dawley rats were treated with a cumulative dose of 9 mg/kg DNR (i.v.). Olmesartan was administered orally every day for 6 weeks. DNR treated rats showed nephrotoxicity as evidenced by worsening renal function, which was evaluated by measuring total cholesterol, triglyceride levels in kidney tissue and histopathological approaches; treatment with olmesartan reversed these changes. Furthermore, olmesartan treatment down-regulated phospho-MAPKAPK-2, caspase-12, p47phox, p67phox, upregulated renal expression of PPAR-γ, Bcl-xL, glutathione peroxidase and Nrf2. Furthermore, olmesartan down-regulated matrix metalloproteinase-2 and angiotensin II type I receptor expression in the kidney. In conclusion, the result demonstrated that angiotensin II and oxidative stress play a key role in DNR-induced nephrotoxicity. The present results indicated that olmesartan protects against oxidative stress, which may be possibly via the induction of Nrf2 signaling pathways.

Original languageEnglish (US)
Pages (from-to)282-289
Number of pages8
JournalInternational Immunopharmacology
Volume18
Issue number2
DOIs
StatePublished - Feb 2014

Keywords

  • Angiotensin II type I receptor
  • Chronic nephrotoxicity
  • Daunorubicin
  • Nuclear factor-erythroid 2-related factor 2
  • Olmesartan
  • Oxidative stress

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology
  • Pharmacology

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