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缺血における神経保護:カルシウムに浸透する酸を感知するイオンチャネルを遮断する
Zhi-Gang Xiong1, Xiao-Man Zhu, Xiang-Ping Chu
1Robert S Dow Neurobiology Laboratories, Legacy Research, Portland, OR 97232, USA. zxiong@downeurobiology.org
Cell
|September 17, 2004
まとめ
アシドーシスは酸感受性イオンチャンネル (ASIC) を活性化させ,カルシウム (Ca2+) の過負荷と不全性脳卒中の神経損傷を引き起こします. これらのチャネルを遮断することは強力な神経保護を提供し,新しい治療標的を明らかにします.
科学分野:
- 神経科学は神経科学である.
- 細胞生物学 細胞生物学
- バイオケミストリー バイオケミストリー
背景:
- カルシウム (Ca2+) 毒性は,不血性脳損傷の中心にある.
- 以前のグルタミン酸受容体を標的とした神経保護戦略は,限られた成功を収めた.
- 缺血性脳損傷におけるアシドーシスの役割は,未だに十分に理解されていない.
研究 の 目的:
- 缺血性脳における酸誘発性ニューロン損傷のメカニズムを解明する.
- この損傷を媒介する酸感知イオンチャネル (ASIC) の役割を調査する.
- ASIC阻害剤を脳卒中の潜在的な神経保護剤として評価する.
主な方法:
- アシドーシスの神経損傷に対する効果を in vitro および in vivo で調査した.
- ASIC機能を研究するために細胞変異と遺伝子ノックアウトモデルを使用しました.
- 焦点性イシュケミアモデルにおけるASIC阻害剤とグルタミン酸対抗剤の投与.
主要な成果:
- アシドーシスはCa2+透過性ASICを活性化し,Ca2+の流入と神経損傷を引き起こす.
- この損傷メカニズムはグルタミン酸受容体とは無関係です.
- ASICブロッカーは,酸性損傷と不全性脳損傷からニューロンを有意に保護しました.
- ASICアンタゴニズムは,焦点性イシュケミアモデルでグルタミン酸アンタゴニズムよりも強力であることが示されました.
結論:
- アシドーシスは,ASICの活性化と,その後のCa2+毒性を通して,不全性脳卒中の神経損傷を媒介する.
- ASICは,脳卒中治療の新たな治療目標を表しています.
- ASICブロッカーは,缺血性脳損傷に対する有望な神経保護戦略を提供します.
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