title: Preventive effect of (-)epigallocatechin-gallate (EGCG) on lysosomal enzymes in heart and subcellular fractions in isoproterenol-induced myocardial infarcted Wistar rats.
abstract: This study was aimed to evaluate the preventive role of (-)epigallocatechin-gallate (EGCG) on lysosomal enzymes in isoproterenol (ISO)-induced myocardial infarcted rats. Male albino Wistar rats were pretreated with EGCG (30 mg/kg) daily for a period of 21 days. After the treatment period, ISO (100 mg/kg) was subcutaneously injected to rats at intervals of 24h for 2 days. The activities of lysosomal enzymes (beta-glucuronidase, beta-N-acetylglucosaminidase, beta-galactosidase, cathepsin-B and cathepsin-D) were increased significantly (P<0.05) in serum and the heart of ISO-induced rats. ISO-induction also resulted in decreased stability of membranes, which was reflected by decreased activities of beta-glucuronidase and cathepsin-D in mitochondrial, nuclear, lysosomal and microsomal fractions. Pretreatment with EGCG daily for a period of 21 days to ISO-induced rats prevented the changes in the activities of these enzymes. Oral treatment with EGCG (30 mg/kg) to normal control rats did not show any significant effect in all the biochemical parameters studied. Thus, the results of our study shows that EGCG protects the lysosomal membrane against ISO-induced cardiac damage. The observed effects might be due to the free radical scavenging and membrane stabilizing properties of EGCG.
authors.affiliation: Department of Biochemistry and Biotechnology, Annamalai University, Annamalainagar 608002, Tamil Nadu, India.
authors.forename: P T
authors.initials: PT
authors.lastname: Devika
authors.forename: P Stanely Mainzen
authors.initials: PS
authors.lastname: Prince
mesh_terms: D000818:Animals; D002317:Cardiovascular Agents / Q000494:pharmacology / Q000627:therapeutic use*; D002392:Catechin / Q000031:analogs & derivatives* / Q000494:pharmacology / Q000627:therapeutic use; D004195:Disease Models, Animal; D006321:Heart / Q000187:drug effects* / Q000502:physiology; D007545:Isoproterenol; D008247:Lysosomes / Q000187:drug effects* / Q000201:enzymology; D008297:Male; D009203:Myocardial Infarction / Q000139:chemically induced / Q000517:prevention & control*; D051381:Rats; D017208:Rats, Wistar; D013347:Subcellular Fractions / Q000187:drug effects* / Q000201:enzymology; D013997:Time Factors
chemical_list: D002317:Cardiovascular Agents; D002392:Catechin; C045651:epigallocatechin gallate; D007545:Isoproterenol