{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,13]],"date-time":"2026-10-13T17:02:37Z","timestamp":1791910957070,"version":"4.3.4"},"reference-count":32,"publisher":"Wiley","issue":"10","license":[{"start":{"date-parts":[[2009,3,23]],"date-time":"2009-03-23T00:00:00Z","timestamp":1237766400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Phytotherapy Research"],"published-print":{"date-parts":[[2009,10]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The study aimed to evaluate the protective role of myricetin obtained from <jats:italic>Vitis vinifera<\/jats:italic> (Vitaceae) on heart rate, electrocardiographic (ECG) patterns, vascular reactivity to catecholamines, cardiac marker enzymes, antioxidant enzymes together with morphological and histopathological changes in isoproterenol (ISO) induced myocardial infarction (MI) in male Wistar rats. Rats treated with isoproterenol (85 mg\/kg, administered subcutaneously twice at an interval of 24 h) showed a significant increase in heart rate and ST elevation in ECG, and a significant increase in the levels of cardiac marker enzymes \u2013 lactate dehydrogenase (LDH), creatine kinase (CK) and aspartate aminotransferase (AST) in serum. Isoproterenol significantly reduced superoxide dismutase (SOD) and catalase (CAT) activity and increased vascular reactivity to various catecholamines. Pretreatment with myricetin (100 mg\/kg, p.o. and 300 mg\/kg, p.o.) for a period of 21 days significantly inhibited the effects of ISO on heart rate, levels of LDH, CK, AST, SOD, CAT, vascular reactivity changes and ECG patterns. Treatment with myricetin (100 mg\/kg and 300 mg\/kg) alone did not alter any of the parameters compared with vehicle treated Wistar rats. Myricetin treated animals showed a lesser degree of cellular infiltration in histopathological studies. Thus, myricetin (100 mg\/kg and 300 mg\/kg) ameliorates the cardiotoxic effects of isoproterenol and may be of value in the treatment of MI. 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