C. elegans AWA 嗅覚ニューロン 炎 カルシウム媒介型 オール・オア・ノー・アクション・ポテンシャル
Qiang Liu1, Philip B Kidd1, May Dobosiewicz1
1Lulu and Anthony Wang Laboratory of Neural Circuits and Behavior, The Rockefeller University, New York, NY 10065, USA.
Cell
|September 18, 2018
まとめ
AWAの嗅覚ニューロンは意外にアクションポテンシャル,特にカルシウムスパイクを発現します. この発見は ネマトードにおけるニューラル情報処理の 新しいメカニズムを明らかにしています
科学分野:
- 神経科学
- 分子生物学
- 遺伝学
背景:
- 以前は,Caenorhabditis elegansのニューロンには古典的な作用力が存在しないと考えられていた.
- ネマトードにおける神経信号の理解は 比較神経科学にとって極めて重要です
研究 の 目的:
- C. elegans AWA 嗅覚ニューロンの活性ポテンシャルの存在と特徴を調査する.
- これらの神経信号の生成に関与するイオンチャネルを明らかにする.
主な方法:
- C.エレガンスのAWAニューロンの電流クラップ記録
- イオン置換実験と ミュータント分析
- 薬理学的な治療法と コンピューターモデリング
主要な成果:
- AWAニューロンのアクションポテンシャル特性を有する膜ポテンシャルスパイクが観察された.
- EGL-19 (CaV1) カルシウムチャネルがピークを開始し,SHK-1 カリウムチャネルがピークを終了する.
- 匂いの刺激がAWAのピークを誘発し 匂いのグラデーションの上昇と相関していることが示されました
結論:
- C. elegansニューロン,特にAWA嗅覚ニューロンは,カルシウムベースのアクションポテンシャルを生成することができます.
- これらのアクションポテンシャルは ネマトード神経系の 既知の計算能力を拡張します
- この発見は,C. elegansにおけるニューラル・コーディングとネットワーク・ダイナミクスの新しいメカニズムを示唆している.
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