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Cajal帯が欠けているシュワンの細胞の制限された成長は,骨髄性神経の伝導を遅らせます
Felipe A Court1, Diane L Sherman, Thomas Pratt
1Centre for Neuroscience Research, University of Edinburgh, Edinburgh EH9 1QH, UK.
Nature
|September 10, 2004
まとめ
シュヴァン細胞の細胞プラズマ帯は,内部節の延長に不可欠であり,迅速な神経衝動伝導を保証します. 干渉はシュヴァン細胞の成長を阻害し,神経信号伝送を遅らせます.
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
- バイオフィジックス 生物物理学
背景:
- 神経インパルス伝導は,ランヴィエのノードを持つミエリン化された神経に依存しています.
- 内節距離は,神経伝導速度に影響を及ぼすと理論化されているが,そのメカニズムは不明である.
- シュヴァン細胞の細胞質帯 (トラベキュラ) は,歴史的に栄養素であると考えられてきました.
研究 の 目的:
- 内部節の延長におけるシュヴァン細胞の細胞質帯の役割を調査する.
- インターノード長さを調節する細胞機構を決定する.
- 内節距離と神経伝導速度との直接的な関連を確立するために.
主な方法:
- シトプラズマ帯が破壊されたペリアキシンゼロマウスの分析.
- 神経成長中のシュヴァンン細胞の伸びの評価.
- 神経パルス伝導速度の測定. 神経パルス伝導速度を測定する.
- シュヴァンン細胞の伸縮容量に対する細胞自律的測定法.
主要な成果:
- ワイルドタイプの神経の内部成長は,神経の拡張と一致します.
- ペリアキシンゼロマウスの細胞質帯の破壊は,シュヴァンン細胞の伸びを損なう.
- 骨髄形成は,細胞質帯の破壊によって影響を受けません.
- 内節距離の縮小により,伝導速度と運動機能が著しく低下する.
結論:
- 細胞プラズマ帯によって誘発されるシュヴァン細胞の伸びは,神経の成長中に内部節の長さを維持するために不可欠です.
- パッシブストレッチは,インターノード延長に寄与する.
- 細胞質帯の微小管ベースの輸送は,シュヴァンン細胞の延長を促進し,神経衝動伝達速度を最適化します.
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