The Protective Effect of Daming Capsule on Heart Function in Streptozocin-Induced Diabetic Rats with Hyperlipidemia
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概要
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Impaired heart function is the main reason for increased mortality of diabetes mellitus. Development of drugs with cardioprotective effects against diabetic myocardiopathy would benefit patients with diabetes. In this study, we tested the cardioprotective effects of Daming capsule (DMC), a traditional Chinese formula, on heart function in streptozocin (STZ)-induced diabetic rats with high fat-diet (HFD). DMC 100 mg/kg/d markedly decreased fasting blood glucose (FBG) and total cholesterol (TC), but did not affect triglycerides (TG) in diabetic rats at 30 d. The decreased heart rate (HR) and prolonged QT and PR interval induced by diabetes mellitus were significantly reversed by DMC (p<0.05). The mechanism may involve that DMC attenuated L-type calcium channel α1c subunit increasing and Kv4.2 decreasing at both mRNA and protein level in diabetic rats. Additionally, DMC could obviously ameliorate the impaired heart function of diabetic rats by decreasing elevated left ventricular end-diastolic pressure (LVEDP) and increasing the attenuated maximum change velocity of left ventricular pressure in the isovolumic contraction or relaxation period (±dp/dtmax). Transmission electron microscopy (TEM) results showed that myocardium injury was attenuated by DMC (100 mg/kg/d) in STZ-induced diabetic rats with HFD. In conclusion, DMC could recover the prolonged QT interval and PR interval and elevated diastolic and systolic function of diabetic heart. This protective effect may partially be mediated through affecting the mRNA and protein expression of Kv4.2 and α1c as well as preventing cardiomyocyte morphological remodeling.
著者
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Liang Feng
Department Of Microelectronics Xi'an Jiaotong University
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Lu Yuan
Department Of Laboratory Medicine Huashan Hospital Shanghai Medical College Fudan University
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Lu Yanjie
Department of Pharmacology, State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, H
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Yang Baofeng
Department of Pharmacology, State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, H
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Ai Jing
Department of Pharmacology, Harbin Medical University
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Yan Xinxin
Department of Pharmacology, Harbin Medical University
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Zhao Limei
Department of Pharmacology, Harbin Medical University
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Cai Benzhi
Department of Pharmacology, Harbin Medical University
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Li Guoyu
Department of Pharmacology, Harbin Medical University
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Lu Yanjie
Department Of Pharmacology Harbin Medical University:state-province Key Laboratory Of Biopharmaceuti
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Yang Baofeng
Department of Pharmacology, Harbin Medical University
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Liang Feng
Department of Pharmacology, Harbin Medical University
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Lu Yuan
Department of Pharmacology, Harbin Medical University
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Lu Yanjie
Department of Pharmacology, Harbin Medical University
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Liang Feng
Department of Environmental Chemistry and Engineering, Tokyo Institute of Technology, Yokohama 226-8502, Japan
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