Possible involvement of group I mGluRs in neuroprotective effect of theanine.

Abstract:

:We investigated the molecular mechanism underlying the neuroprotective effect of theanine, a green tea component, using primary cultured rat cortical neurons, focusing on group I metabotropic glutamate receptors (mGluRs). Theanine and a group I mGluR agonist, DHPG, inhibited the delayed death of neurons caused by brief exposure to glutamate, and this effect of theanine was abolished by group I mGluR antagonists. Although the administration of glutamate alone decreased the neuronal expression of phospholipase C (PLC)-beta1 and -gamma1, which are linked to group I mGluRs, their expression was equal to the control levels on cotreatment with theanine. Treatment with theanine or DHPG alone for 5-7 days resulted in increased expression of PLC-beta1 and -gamma1, and the action of theanine was completely abolished by group I mGluR antagonists. These findings indicate that group I mGluRs might be involved in neuroprotective effect of theanine by increasing the expression levels of PLC-beta1 and -gamma1.

authors

Nagasawa K,Aoki H,Yasuda E,Nagai K,Shimohama S,Fujimoto S

doi

10.1016/j.bbrc.2004.05.143

subject

Has Abstract

pub_date

2004-07-16 00:00:00

pages

116-22

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006291X04011544

journal_volume

320

pub_type

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