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nTSにおける酸化窒素合成酵素の活性化は,NMDA受容体に依存した咳反射のエンコーディングに不可欠である
David G S Farmer1, Nanako Mori2, Loren Saulsberry3
1Central Clinical School, Monash University, Level 6, Alfred Centre, 99 Commercial Road, Melbourne, VIC 3004, Australia.
まとめ
窒素酸化物 (NO) は,脳幹における咳のシグナル伝達に不可欠であり,NMDA受容体の下流に作用する. このNO経路は,咳の反射をコードするのに不可欠ですが,cGMPシグナル伝達には関わっていません.
科学分野:
- 神経科学は神経科学である.
- 呼吸器生理学 呼吸器生理学について
背景:
- 咳の反射は,ポリモダル動系アファレント神経によって調節されます.
- これらの神経は,脳幹の重要な領域である単一管内核 (nTS) に終結する.
- 咳のシグナル伝達には,特にN-メチル-D-アスパルテート (NMDA) 受容体の活性化が必要です.
研究 の 目的:
- 咳のエンコーディングにおける酸化窒素合成酵素 (NOS) アクティベーションとcGMPの役割を調査する.
- NOSの発現が咳受容体リレーニューロンの特徴であるかどうかを判断する.
主な方法:
- NOS発現ニューロンを特定するためにNADPH-ディアフォラーゼ染色.
- NOS阻害剤,NMDA受容体阻害剤,およびNOドナーのマイクロ注射を中央単一管内核 (SolM) に行う.
- リン酸チャレンジとNMDAマイクロ注射によって引き起こされた咳の反応を評価する.
主要な成果:
- NOSを発現するニューロンは, SolMの珍しい例を含む脳幹で発見されました.
- SolMにおけるNOSまたはNMDA受容体を阻害することで,酸による咳が著しく減少しました.
- NMDAマイクロインジェクションは,NOSに依存する咳の反応を誘導したが,cGMP経路は誘導しなかった.
結論:
- 酸化窒素 (NO) は,NMDA受容体媒介の下流メディエーターであり,nTSにコードされている.
- 咳の経路にはNOSの活性化が含まれていますが,溶性ガニラートサイクラゼやcGMPに依存していません.
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