新皮質の電気的に結合した抑制性ニューロンの2つのネットワーク
J R Gibson1, M Beierlein, B W Connors
1Department of Neuroscience, Brown University, Providence, Rhode Island 02912, USA.
Nature
|November 26, 1999
まとめ
新皮質の2つの異なる阻害性インターニューロンネットワーク,高速スパイキング (FS) と低値スパイキング (LTS) は,独立したネットワーク機能を可能にする特定の電気的および化学的シナプス接続を示します.
科学分野:
- 神経科学は神経科学である.
- 細胞神経科学は細胞神経科学である.
- シナプスの可塑性
背景:
- 阻害性インターニューロンは,感覚処理や同期活動などの新皮質機能に不可欠です.
- 異なる阻害性インターニューロンタイプの正確なシナプス組織は,ほとんど不明のままである.
研究 の 目的:
- 2つの異なる阻害性インターニューロンネットワークのシナプス組織の解明:急速スパイキング (FS) と低値スパイキング (LTS).
- FSおよびLTSネットワーク内およびその間の電気および化学シナプスを含む特定の接続パターンを調査する.
- タラモ皮質の入力がどのようにこれらの阻害ネットワークをターゲットにするかを決定する.
主な方法:
- 新皮質のペア細胞の記録を用いて,阻害性内ニューロン間のシナプス結合を分析した.
- 電気的および化学的シナプス伝送を区別する.
- FSおよびLTSニューロンに対するタラモコルクスのインプットの影響を調べました.
主要な成果:
- 主にFS-FSとLTS-LTSのニューロンペア内の強力な電気シナプスを特定し,発火を同期しました.
- FS-FSとFS-LTSニューロン間の化学阻害シナプスが頻繁に観察されたが,LTS-LTS阻害はまれである.
- タラモ皮質のシナプスが選択的かつ強くFS内部ニューロンネットワークを刺激することを実証した.
結論:
- 特定の電気的および化学的シナプス接続は,異なる阻害ネットワーク (FSおよびLTS) を生み出します.
- これらの専門的なネットワークは,独立して動作し,皮質の処理にユニークな形で貢献することがあります.
- タラモ皮質からの入力によるFSネットワークの標的型刺激は,最初の感覚情報ゲーティングにおける特定の役割を示唆しています.
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