Polyphenol (-)-epigallocatechin gallate targeting myocardial reperfusion limits infarct size and improves cardiac function.
10.4097/kjae.2010.58.2.169
- Author:
Chan Jin KIM
1
;
Jin Mo KIM
;
Seung Ryong LEE
;
Young Ho JANG
;
June Hong KIM
;
Kook Jin CHUN
Author Information
1. Department of Anesthesiology and Pain Medicine, School of Medicine, Keimyung University, Daegu, Korea.
- Publication Type:Original Article
- Keywords:
(-)-Epigallocatechin gallate;
Green tea;
Myocardium;
Reperfusion injury
- MeSH:
Animals;
Catechin;
Heart;
Ischemia;
Myocardial Infarction;
Myocardial Reperfusion;
Myocardium;
Rats;
Reperfusion;
Reperfusion Injury;
Tea;
Tetrazolium Salts
- From:Korean Journal of Anesthesiology
2010;58(2):169-175
- CountryRepublic of Korea
- Language:English
-
Abstract:
BACKGROUND: This experiment was performed to determine the effect of polyphenolic (-)-epigallocatechin (EGCG), the most abundant catechin of green tea, given at reperfusion period. METHODS: Isolated rat hearts were subjected to 30 min of regional ischemia and 2 h of reperfusion. Green tea extract (GT) was perfused with the following concentrations; 0, 0.5, and 1 micrometer (GT-O, GT-0.5, and GT-1, respectively). In a next experiment, hearts were assigned randomly to one of the following groups; Control, EGCG-1 (1 micrometer of EGCG), and EGCG-10 (10 micrometer of EGCG). GT and EGCG were perfused for a period of 5 min before and 30 min after reperfusion. For comparison of cardioprotection among groups, morphometric measurement was performed by 2,3,5-triphenyltetrazolium chloride staning. RESULTS: GT 1 micrometer (10.3 +/- 2.1%, P < 0.05) significantly reduced infarct volume as a percentage of ischemic volume compared to untreated hearts (27.4 +/- 1.1%). EGCG 10 micrometer (13.2 +/- 4.0%) significantly reduced myocardial infarction compared to control hearts (27.2 +/- 1.4%, P = 0.002). After 2 h of reperfusion, cardiodynamic variables, including left ventricular developed pressure, rate-pressure produce, +dP/dt(max), and -dP/dt(min) were significantly improved by 10 micrometer of EGCG compared to control hearts (P = 0.01, 0.016, 0.009, and 0.019, respectively). CONCLUSIONS: EGCG treatment at an early reperfusion period reduces myocardial infarction and improves cardiodynamics in isolated rat hearts.
