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Neuroprotective effect of γ-glutamylethylamide (theanine) on cerebral infarction in mice

Nobuaki Egashira, Kazuhide Hayakawa, Kenichi Mishima, Hitomi Kimura, Katsunori Iwasaki and Michihiro Fujiwara

Department of Neuropharmacology, Faculty of Pharmaceutical Sciences, Fukuoka University, 8-19-1, Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan, Advanced Materials Institute, Fukuoka University, Fukuoka 814-0180, Japan

Copyright © 2004 Published by Elsevier Science Ireland Ltd.
 

Abstract

In the present study, we examined the neuroprotective effect of γ-glutamylethylamide (theanine) on the ischemic brain damage in a middle cerebral artery occlusion model in mice. Theanine was injected i.p. 3 h after the occlusion or immediately before and 3 h after the occlusion. Theanine (1 mg/kg) significantly decreased the size of the cerebral infarcts 1 day after the occlusion. In contrast, theanine did not affect the cerebral blood flow, brain temperature and physiological variables (pH, pCO₂, pO₂ and hematocrit) in this model. These results suggest that theanine directly provides neuroprotection against focal cerebral ischemia and may be clinically useful for preventing cerebral infarction.
 

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