AT1 Receptor Modulator Attenuates the Hypercholesterolemia-Induced Impairment of the Myocardial Ischemic Post-Conditioning Benefits.
- Author:
Yun Wei LI
1
;
Yan Ming LI
;
Yan HON
;
Qi Lin WAN
;
Rui Li HE
;
Zhi Zhong WANG
;
Cui Hua ZHAO
Author Information
- Publication Type:Original Article
- Keywords: AT1 receptor blocker; Ischemia-reperfusion injury; Azilsartan; myocardial infarction
- MeSH: Angiotensin II; Animals; Collagen; Creatine Kinase; Diet, High-Fat; Glutathione; Heart; Heart Ventricles; Hemodynamics; Hypercholesterolemia; Ischemia; Ischemic Postconditioning*; L-Lactate Dehydrogenase; Myocardial Infarction; Myocardial Ischemia; Nitric Oxide Synthase Type III; Rats; Reperfusion; Reperfusion Injury; Superoxides; Troponin I; Tumor Necrosis Factor-alpha
- From:Korean Circulation Journal 2017;47(2):182-192
- CountryRepublic of Korea
- Language:English
- Abstract: BACKGROUND AND OBJECTIVES: Ischemic post-conditioning (PostC) has been demonstrated as a novel strategy to harness nature's protection against myocardial ischemia-reperfusion (I/R). Hypercholesterolemia (HC) has been reported to block the effect of PostC on the heart. Angiotensin II type-1 (AT1) modulators have shown benefits in myocardial ischemia. The present study investigates the effect of a novel inhibitor of AT1, azilsartan in PostC of the heart of normocholesterolemic (NC) and HC rats. MATERIALS AND METHODS: HC was induced by the administration of high-fat diet to the animals for eight weeks. Isolated Langendorff's perfused NC and HC rat hearts were exposed to global ischemia for 30 min and reperfusion for 120 min. I/R-injury had been assessed by cardiac hemodynamic parameters, myocardial infarct size, release of tumor necrosis factor-alpha troponin I, lactate dehydrogenase, creatine kinase, nitrite in coronary effluent, thiobarbituric acid reactive species, a reduced form of glutathione, superoxide anion, and left ventricle collagen content in normal and HC rat hearts. RESULTS: Azilsartan post-treatment and six episodes of PostC (10 sec each) afforded cardioprotection against I/R-injury in normal rat hearts. PostC protection against I/R-injury was abolished in HC rat hearts. Azilsartan prevented the HC-mediated impairment of the beneficial effects of PostC in I/R-induced myocardial injury, which was inhibited by L-N⁵-(1-Iminoethyl)ornithinehydrochloride, a potent inhibitor of endothelial nitric oxide synthase (eNOS). CONCLUSION: Azilsartan treatment has attenuated the HC-induced impairment of beneficial effects of PostC in I/R-injury of rat hearts, by specifically modulating eNOS. Azilsartan may be explored further in I/R-myocardial injury, both in NC and HC conditions, with or without PostC.
