KR-31761, a Novel K+ATP-Channel Opener, Exerts Cardioprotective Effects by Opening Both Mitochondrial K+ATP and Sarcolemmal K+ATP Channels in Rat Models of Ischemia/Reperfusion-Induced Heart Injury

Journal of Pharmacological Sciences

Hun-Jong Chung⁶  Chang-Soo Lee³  Ho-Won Seo¹  Hwa-Sup Shin³  Hyung-Sik Won⁵  Sung-Hun Lee³  Min-Kyu Yang³  Sung-Eun Yoo¹  Kyu-Yang Yi¹  Suk-Hyung Kwon⁴  Byung-Ho Lee¹  Wahn-Soo Choi² 

[1] Medical Science Division, Korea Research Institute of Chemical Technology, Korea;Department of Immunology, College of Medicine, Konkuk University, Korea;Department of Applied Biochemistry, Division of Life Science, College of Biomedical and Health Science, Konkuk University, Korea;Rexgene Biotech Co., Ltd., Korea;Department of Biotechnology, Division of Life Science, College of Biomedical and Health Science, Konkuk University, Korea;Pediatric Department, Chungju Hospital, Konkuk Medical School, Konkuk University, Korea

关键词: KR-31761;    cardioprotection;    KATP;    ischemia/reperfusion;    rat heart;   

DOI  :  10.1254/jphs.08132FP

学科分类：药学

来源: Nihon Yakuri Gakkai Henshuubu / Japanese Pharmacological Society

【 摘 要 】

References(54)Cited-By(5)The cardioprotective effects of KR-31761, a newly synthesized K+ATP opener, were evaluated in rat models of ischemia/reperfusion (I/R) heart injury. In isolated rat hearts subjected to 30-min global ischemia/30-min reperfusion, KR-31761 perfused prior to ischemia significantly increased both the left ventricular developed pressure (% of predrug LVDP: 17.8, 45.1, 54.2, and 62.6 for the control, 1 μM, 3 μM, and 10 μM, respectively) and double product (DP: heart rate × LVDP; % of predrug DP: 17.5, 44.9, 56.2, and 64.5 for the control, 1 μM, 3 μM, and 10 μM, respectively) at 30-min reperfusion while decreasing the left ventricular end-diastolic pressure (LVEDP). KR-31761 (10 μM) significantly increased the time to contracture during the ischemic period, whereas it concentration-dependently decreased the lactate dehydrogenase release during reperfusion. All these parameters were significantly reversed by 5-hydroxydecanoate (5-HD, 100 μM) and glyburide (1 μM), selective and nonselective blockers of the mitochondrial K+ATP (mitoK+ATP) channel and K+ATP channel, respectively. In anesthetized rats subjected to 30-min occlusion of left anterior descending coronary artery/2.5-h reperfusion, KR-31761 administered 15 min before the onset of ischemia significantly decreased the infarct size (72.2%, 55.1%, and 47.1% for the control, 0.3 mg/kg, i.v., and 1.0 mg/kg, i.v., respectively); and these effects were completely and almost completely abolished by 5-HD (10 mg/kg, i.v.) and HMR-1098, a selective blocker of sarcolemmal K+ATP (sarcK+ATP) channel (6 mg/kg, i.v.) administered 5 min prior to KR-31761 (72.3% and 67.9%, respectively). KR-31761 only slightly relaxed methoxamine-precontracted rat aorta (IC50: >30.0 μM). These results suggest that KR-31761 exerts potent cardioprotective effects through the opening of both mitoK+ATP and sarcK+ATP channels in rat hearts with a minimal vasorelaxant effect.

【 授权许可】

Unknown