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This study evaluates the protective effects of 7-hydroxycoumarin (7-HC) on dyslipidemia and cardiac hypertrophy in isoproterenol (ISO) induced myocardial infarction (MI) in rats. Rats were pre- and co treated with 7-HC (16 mg/kg) daily for 8 days. ISO (100 mg/kg) was subcutaneously injected into rats on seventh and eighth days to induce MI. Increased activity/levels of serum creatine kinase-MB (CK-MB), troponin-T, plasma lipid peroxidation products, and altered levels of lipids in the serum and heart and serum lipoproteins were noted in ISO-induced rats. ISO-induced myocardial infarcted rats revealed increased hypertrophy (cardiac and left ventricular) and hepatic 3-hydroxyl 3-methylglutaryl-coenzyme-A reductase (HMG-CoA reductase) activity. Pre and cotreatment with 7-HC revealed significant protective effects on all the biochemical parameters evaluated. The in vitro study demonstrated its free radical scavenging property. Thus, 7-HC protects ISO-induced MI in rats by its free radical scavenging and antihyperlipidaemic and antihypertrophic properties.

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