Korean J Anesthesiol.  2010 Feb;58(2):169-175. 10.4097/kjae.2010.58.2.169.

Polyphenol (-)-epigallocatechin gallate targeting myocardial reperfusion limits infarct size and improves cardiac function

• Kim CJ
• Kim JM
• Lee SR
• Jang YH
• Kim JH
• Chun KJ

• KMID: 2092273
• DOI: http://doi.org/10.4097/kjae.2010.58.2.169

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.

Keyword

(-)-Epigallocatechin gallate; Green tea; Myocardium; Reperfusion injury

MeSH Terms

Animals
Catechin
Heart
Ischemia
Myocardial Infarction
Myocardial Reperfusion
Myocardium
Rats
Reperfusion
Reperfusion Injury
Tea
Tetrazolium Salts
Catechin
Tea
Tetrazolium Salts