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Green tea extract protects rats against myocardial infarction associated with left anterior descending coronary artery ligation

  • Cardiovascular Physiology
  • Published:
Pflügers Archiv - European Journal of Physiology Aims and scope Submit manuscript

Abstract

There is increasing evidence that green tea polyphenols can protect against myocardial damage. Recently, we showed that they bind to cardiac troponin C and alter myofilament Ca2+ sensitivity in cardiac muscle. In the present study, we examined whether green tea extract (GTE) could prevent the progressive remodeling seen in ischemic myocardium and improve cardiac function by modulation of the contractile apparatus utilizing a myocardial infarction (MI) model in the rat involving ligation of the left anterior descending branch. Using this model, severe myocardial injury was found, including altered cardiac performance and the appearance of extensive fibrosis and left ventricular (LV) enlargement. Supplementation with 400 mg/kg/day of GTE for 4, 18, or 46 days had beneficial effects in preventing the hemodynamic changes. Histopathological studies showed that GTE attenuated the progressive remodeling seen after myocardial injury. Echocardiography confirmed that GTE prevented LV enlargement and improved LV performance in post-MI rats. In addition, we showed that GTE supplementation for 18 or 46 days increased the myofilament Ca2+ sensitivity of the ischemic myocardium in post-MI rats. These results validate the novel action of green tea polyphenols in protecting against myocardial damage and enhancing cardiac contractility by modulating myofilament Ca2+ sensitivity in post-MI rats.

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Acknowledgments

This work was supported in part by the National Science Council of Taiwan (NSC 95-2320-B-005-005) and cooperative projects between the Taichung Veterans General Hospital and the NCHU (TCVGH-NCHU 967602).

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Authors and Affiliations

  1. Department of Cardiovascular Surgery, Taichung Veterans General Hospital, Taichung, 407, Taiwan

    Shih-Rong Hsieh

  2. Department of Life Sciences, National Chung-Hsing University, 250 Kuokang Road, Taichung, 402, Taiwan

    Dan-Chin Tsai, Jan-Yow Chen, Sen-Wei Tsai & Ying-Ming Liou

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  1. Shih-Rong Hsieh
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Correspondence to Ying-Ming Liou.

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Hsieh, SR., Tsai, DC., Chen, JY. et al. Green tea extract protects rats against myocardial infarction associated with left anterior descending coronary artery ligation. Pflugers Arch - Eur J Physiol 458, 631–642 (2009). https://doi.org/10.1007/s00424-009-0655-1

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