期刊
EXPERIMENTAL AND TOXICOLOGIC PATHOLOGY
卷 60, 期 4-5, 页码 397-404出版社
ELSEVIER GMBH
DOI: 10.1016/j.etp.2008.03.010
关键词
Ginkgo biloba phytosomes; cardioprotective; antioxidant activity; isoproterenol; cardiac necrosis
The protective effects of Ginkgo biloba Phytosomes (GBP) in isoproterenol (ISO)-induced cardiotoxicity and the antioxidant activity involved in this protection were investigated in rats. Myocardial infarction was produced in rats with 65, 85, 120 and 200 mg/kg of ISO administered subcutaneously (sc) twice at an interval of 24 h. An ISO dose of 85mg/kg was selected for the present study as this dose offered significant alteration in biochemical parameters and moderate necrosis in heart. Effect of GBP oral treatment for 21 days at two doses (100 mg and 200 mg/kg body weight) was evaluated against ISO (85 mg/kg, sc)-induced cardiac necrosis. Levels of marker enzymes (AST, LDH and CPK) were assessed in serum and heart, antioxidant parameters viz., reduced glutathione (GSH), superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx) and glutathione reductase (GR) and malondialdehde (MDA) were assayed in heart homogenate. Significant myocardial necrosis, depletion of endogenous antioxidants and increase in serum levels of marker enzymes were observed in ISO-treated animals when compared with the normal animals. GBP elicited a significant cardioprotective activity by lowering the levels of serum marker enzymes and lipid peroxidation and elevated the levels of GSH, SOD, CAT, GPx and GR. The present findings have demonstrated that the cardioprotective effects of GBP in ISO-induced oxidative damage may be due to an augmentation of the endogenous antioxidants and inhibition of lipid peroxidation of membrane. (C) 2008 Elsevier GmbH. All rights reserved.
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