Journal
NEUROSCIENCE LETTERS
Volume 287, Issue 3, Pages 191-194Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/S0304-3940(00)01159-9
Keywords
global ischemia; gerbil; hippocampus; neuroprotection; green tea; polyphenol; (-)-epigallocatechin gallate; antioxidant
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Recent studies have shown that green tea polyphenols reduce free radical-induced lipid peroxidation. Oxygen free radical injury plays an important role in neuronal damage induced by brain ischemia and reperfusion. The purpose of this study was to examine whether (-)-epigallocatechin gallate (EGCG) would reduce neuronal damage after transient global ischemia in the gerbils because EGCG has a potent antioxidant property as a green tea polyphenol. To produce transient global ischemia, both common carotid arteries were occluded for 3 min with microaneurysmal clips. The gerbils were treated with EGCG (10, 25, or 50 mg/kg, i.p.) immediately after ischemia. Neuronal cell damage in the hippocampal CA1 region was evaluated quantitatively 5 days after ischemia by a blinded investigator. EGCG at the dose of 10 mg/kg failed to reduce hippocampal neuronal damage. However, EGCG when administered at the dose of 25 or 50 mg/kg significantly reduced hippocampal neuronal damage in a dose-dependent manner (P < 0.001, respectively). The present results show that the green tea polyphenol, EGCG, has a neuroprotective effect against neuronal damage following global ischemia in the gerbils. (C) 2000 Elsevier Science Ireland Ltd. All rights reserved.
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