Tea catechins improve left ventricular dysfunction, suppress myocardial inflammation and fibrosis, and alter cytokine
Jun-Ichi Suzuki1, Masahito Ogawa, Hideki Futamatsu
1Department of Cardiovascular Medicine, Tokyo Medical and Dental University, Tokyo 113-8519, Japan, and Central Research Institute, ITO EN, LTD., Shizuoka, Japan. jsuzuki.cvm@tmd.ac.jp
Background:
Myocarditis is a clinically serious disease. Tea catechins have been shown to reduce inflammation; however the effects of catechins on the development of myocarditis have not been well studied.
Aims:
To clarify the role of catechins, using an experimental autoimmune myocarditis (EAM) model.
Methods And Results:
Lewis rats were immunized with porcine cardiac myosin to establish EAM. Tea catechins were administered orally from day 0 to day 21 (Group A, n=12), from day 14 to day 21 (Group B, n=8), or saline (Group C, n=9) daily. Rats were killed on day 21. Echocardiograms indicated that Group A showed significantly improved cardiac function compared to Group C. Pathologically, non-treated EAM hearts showed severe myocardial cell infiltration and fibrosis; however Group A showed significantly less area. Immunohistochemistry revealed enhanced expression of NF-kappaB and ICAM-1 in non-treated EAM hearts, which was suppressed by catechin administration in Group A. mRNA levels of TNF-alpha were decreased and Th2 cytokines were markedly enhanced in Group A compared with the control group. Late catechin administration (Group B) showed limited effects on EAM.
Conclusion:
The catechins suppressed ventricular remodelling in EAM; thus catechin treatment might be a promising option for the prevention of EAM myocarditis.
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