Cardioprotective activity of Ginkgo biloba Phytosomes in isoproterenol-induced myocardial necrosis in rats: a biochemical and histoarchitectural evaluation.
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 200mg/kg of ISO administered subcutaneously (sc) twice at an interval of 24h. 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 (100mg and 200mg/kg body weight) was evaluated against ISO (85mg/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.
Panda
Vandana S
VS
Department of Pharmacology and Toxicology, Prin. K. M. Kundnani College of Pharmacy, Rambhau Salgaonkar Marg, Cuffe Parade, Colaba, Mumbai 400 005, India.
Naik
Suresh R
SR
D000318:Adrenergic beta-Agonists / Q000633:toxicity; D000818:Animals; D020441:Ginkgo biloba / Q000737:chemistry; D006321:Heart / Q000187:drug effects; D007545:Isoproterenol / Q000633:toxicity; D009203:Myocardial Infarction / Q000139:chemically induced; D017202:Myocardial Ischemia / Q000517:prevention & control*; D009206:Myocardium / Q000473:pathology; D009336:Necrosis / Q000139:chemically induced / Q000517:prevention & control; D018384:Oxidative Stress / Q000187:drug effects*; D008517:Phytotherapy; D010936:Plant Extracts / Q000494:pharmacology*; D051381:Rats; D017208:Rats, Wistar
D000318:Adrenergic beta-Agonists; D010936:Plant Extracts; D007545:Isoproterenol