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J Nutr Sci Vitaminol (Tokyo). 1999 Jun;45(3):337-46.

Effects of green tea catechin on phospholipase A2 activity and antithrombus in streptozotocin diabetic rats.

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Department of Food Science and Nutrition, Catholic University of Taegu-Hyosung, Kyungbuk, Korea.


The purpose of this study was to investigate the effects of dietary green tea catechin on phospholipase A2 (PLA2) activity and the antithrombotic reaction of platelets in streptozotocin (STZ)-diabetic rats. Sprague-Dawley male rats weighing 100 +/- 10 g were randomly divided into one normal and three STZ-diabetic groups, which were subdivided into catechin-free group (DM-0C), 0.5% catechin group (DM-0.5C) and 1% catechin group (DM-1C). The activity level of platelet phospholipase A2 was higher in the diabetic groups than in the normal group, while it was lower in DM-0.5C and DM-1C than in DM-0C. The activity of platelet cyclooxygenase in DM-0C was 1.1-fold as high as in the normal group, but was significantly reduced by catechin supplementation. The platelet thromboxane A2 (TXA2) formation became higher in DM-0C as compared to the normal group, but not in DM-0.5C and DM-1C. The synthesis of aortic prostacyclin (PGI2) was lower in DM-0C and DM-0.5C than in the normal group. The PGI2/TXA2 ratio was decreased to 55% in DM-0C, but was restored by catechin supplementation. These results indicate that STZ-diabetic rats are sensitive to platelet aggregation and thrombosis, and that the abnormality can be improved by dietary catechin.

[Indexed for MEDLINE]

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