哺乳類の脊髄におけるカイナート受容体媒介の感覚シナプス伝達
1Department of Anesthesiology, Washington University in St Louis, Missouri 63110, USA.
Nature
|January 29, 1999
まとめ
脊髄カイネート受容体は,表面的背中角の高速刺激性ポストシナプス電流 (EPSCs) を媒介する. これらの受容体は,高値の感覚繊維によって活性化され,痛みの伝播に貢献します.
科学分野:
- 神経科学は神経科学である.
- 神経生理学 神経生理学とは
背景:
- グルタミン酸は,中枢神経系の主要な興奮神経伝達物質です.
- AMPAとNMDA受容体は,シナプス伝達と可塑性における役割でよく特徴付けられています.
- カイナート受容体の生理学的機能,特にヒポカンプスにおける機能は,最近注目されています.
研究 の 目的:
- 脊髄におけるカイナート受容体の役割を調査する.
- 脊髄カイネート受容体を活性化する特定のアファレント繊維の種類を決定する.
- 脊髄カイネート受容体の体感覚伝達と痛みに対する貢献を調査する.
主な方法:
- 主要なアファレント感覚繊維の高強度単発ショック刺激.
- 脊髄の背中角における刺激性ポストシナプス電流 (EPSC) の電気生理学的記録.
- カイナートおよびAMPA受容体の薬理学的阻害,およびミュオピエート受容体アゴニストの適用.
主要な成果:
- 感覚繊維の高強度刺激は,表面的背中の角に,迅速に,カイナート受容体媒介のEPSCを誘発した.
- 低値アフェレント繊維は,AMPA受容体媒介のEPSCのみを活性化する.
- カイナート受容体媒介のEPSCは,ミュオピアートアゴニストによって阻害され,カイナートとAMPA受容体の結合阻害は,アンチノシセプションをもたらした.
結論:
- 脊髄カイナート受容体は,高値のノシセプティブおよび熱感受性一次アフェレント繊維によって活性化されます.
- 脊髄カイナート受容体は,体感覚情報の伝達において重要な役割を果たします.
- 脊髄カイナート受容体をターゲットにすることは,痛みの管理のための新しいアプローチを提供することができます.
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