Local delivery of green tea catechins inhibits neointimal formation in the rat carotid artery injury model.

Abstract:

:It has been shown that green tea catechins (GTC) suppress proliferation of vascular smooth muscle cells (VSMCs) and that epigallocatechin-3-gallate (EGCG), which is a major constituent of GTC, selectively inhibits the platelet-derived growth factor-BB (PDGF-BB)-induced intracellular signaling transduction pathway. Vascular smooth muscle cell proliferation is one of major mechanisms of restenosis following percutaneous coronary intervention. This study tested whether GTC can inhibit VSMC proliferation and prevent neointimal formation in a rat carotid artery injury model. Vascular smooth muscle cell proliferation inhibition was analyzed with [3H]thymidine incorporation. Green tea catechins were applied to the endothelium-denuded carotid arteries of rats for 20 min. Angiography and morphometric analysis was performed after 2 weeks. Green tea catechins decreased [3H]thymidine incorporation stimulated with PDGF-BB dose dependently. In the absence of PDGF-BB, the decrement of [3H]thymidine incorporation was evident above a concentration of 10 micro g/ml of GTC. Carotid arteriographic evaluation showed that the minimum luminal diameter in the GTC-treated group (n=12) was 5.9 +/- 1.6 arbitrary units (a.u.) and was significantly larger than in the control group (4.3 +/- 1.4 a.u., n=10) ( P <0.05). The GTC-treated group also showed a significant reduction in neointimal formation compared with the control group (0.29 +/- 0.11 vs 0.42 +/- 0.10 mm2, P < 0.05). To identify the active ingredients, we performed a similar experiment using EGCG. The effects of EGCG were similar to those of GTC. Green tea catechins effectively inhibited VSMC proliferation. Neointimal formation was prevented in the rat carotid artery injury model by local delivery of GTC. As EGCG showed similar effects, it may be one of the major constituents of GTC having these effects.

journal_name

Heart Vessels

journal_title

Heart and vessels

authors

Kim DW,Park YS,Kim YG,Piao H,Kwon JS,Hwang KK,Youn TJ,Park JB,Yun YP,Sachinidis A,Kim CH,Cho MC,Ahn HY

doi

10.1007/s00380-004-0768-6

subject

Has Abstract

pub_date

2004-09-01 00:00:00

pages

242-7

issue

5

eissn

0910-8327

issn

1615-2573

journal_volume

19

pub_type

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