Effect of Gastrodiae Rhizoma on Apoptosis in Cerebral Infarction Induced by Middle Cerebral Artery Occlusion in Rats

천마가 중대뇌동맥 폐쇄 흰쥐의 신경세포 자연사에 미치는 영향

  • Youn, You-Suk (Dept. of Oriental Rehabilitation Medicine, College of Oriental Medicine, Kyung-Hee University) ;
  • Lee, Jong-Soo (Dept. of Oriental Rehabilitation Medicine, College of Oriental Medicine, Kyung-Hee University)
  • 윤유석 (경희대학교 한의과대학 한방재활의학과교실) ;
  • 이종수 (경희대학교 한의과대학 한방재활의학과교실)
  • Received : 2009.04.07
  • Accepted : 2009.07.02
  • Published : 2009.07.31

Abstract

Objectives : This study evaluates neuroprotective effect of Gastrodiae Rhizoma on apoptosis in the cerebral infarct. Methods : Cerebral infarct was induced by the middle cerebral artery occlusion (MCAO) for 2 hours with intraluminal thread method in Sprague-Dawley rats. Then ethanol extract of Gastrodiae Rhizoma was administered orally for 3 days. Infarct area and volume were evaluated with TTC staining. Neuronal apoptosis was identified with TUNEL labeling. Apoptosis modulatory effect was observed with immunohistochemical Bax, Bcl-2, iNOS, and MMP-9 expressions in penumbra. Results : 1. Ethanol extract of Gastrodiae Rhizoma reduced infarct size partly and volume significantly of in the MCAO rat brain. 2. Ethanol extract of Gastrodiae Rhizoma reduced TUNEL positive cell ratio in the penumbra of MCAO rat brain significantly. 3. Ethanol extract of Gastrodiae Rhizoma suppressed Bax, iNOS and MMP-9 expression in the penumbra of MCAO rat brain significantly. 4. Ethanol extract of Gastrodiae Rhizoma did not change Bcl-2 expression in the penumbra of MCAO rat brain. But expression ratio of Bcl-2 against Bax was increased in the Gastrodiae Rhizoma group. Conclusions : These results suggest that Gastrodiae Rhizoma plays an anti-apoptotic neuroprotective effect through suppression of Bax, iNOS, and MMP-9 expressions and relative up-regulation of Bcl-2 in the ischemic brain tissue.

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