コーンの視力における光の適応は,受容体と受容後部位の切り替えを伴う
Felice A Dunn1, Martin J Lankheet, Fred Rieke
1Program in Neurobiology and Behavior, University of Washington, Seattle, Washington 98195, USA.
Nature
|September 14, 2007
まとめ
人間の視力は2つの網膜メカニズムを使用して,極端な光の変化に適応します. 適応は,光レベルが上昇するにつれて,神経回路から円光受容体にシフトし,さまざまな環境で視力を可能にします.
科学分野:
- 神経科学は神経科学である.
- ビジョン ビジョン 科学 科学
背景:
- 人間の視力は,神経信号の範囲を超えて,巨大な光の強度の違いに適応しなければなりません.
- 網膜ニューロンは受容体と受容体後の適応のようなメカニズムを使用して,サッカドの間の感受性を調整します.
研究 の 目的:
- 網膜回路内のポスト受容体適応の位置を特定するために.
- 異なる照明条件下での受容体と受容体後の適応の相互作用を理解する.
主な方法:
- 網膜経路における適応メカニズムを研究した.
- コーン型双極細胞からギャングリアン細胞への信号処理を測定した.
主要な成果:
- ポスト受容体適応は,コーンバイポラーからギャングリオン細胞への信号伝送中に起こります.
- 受容体と受容体後の適応は,互いを基本的には排斥しています.
- 適応の主な部位は網膜回路から光濃度が増加するにつれてコーン光受容体にシフトする.
結論:
- コーンからギャングリオン細胞経路におけるポスト受容体適応のための新しい部位を特定しました.
- ビジュアルシーンのエンコーディングに不可欠な適応部位におけるダイナミックなスイッチを実証した.
- 難しい環境での感覚システムの適応性についての洞察を提供します.
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