触覚に対する皮質反応は,LTMR信号の皮質下統合を反映している
Alan J Emanuel1,2, Brendan P Lehnert1,2, Stefano Panzeri3,4
1Department of Neurobiology, Harvard Medical School, Boston, MA, USA.
Nature
|November 18, 2021
まとめ
触覚は 異なる皮膚受容体からの信号を 統合することに依存しています この研究は,迅速に適応する (RA) とゆっくり適応する (SA) の低値メカニカル受容体 (LTMR) が脳内で触覚表現を生み出すためにどのように協力するか明らかにしています.
科学分野:
- 神経科学
- ソマトセンシング
- 受信メカニズム
背景:
- 触覚知覚の現在のモデルは,メカニカル受容体のサブタイプと体感覚皮質のニューロン反応を比較する.
- 皮質のタッチ表現における周辺的メカニカル受容体の特定の役割を理解することは極めて重要です.
研究 の 目的:
- ネズミの遺伝子モデルを用いて,触覚に対する皮質の反応に寄与する外周メカニカル受容体のサブタイプを調査する.
- 肉感覚系内の機械感覚信号の統合と変換を解明する.
主な方法:
- 特定の低値メカニカル受容体 (LTMR) のシグナルを妨害するためにマウスの遺伝子操作を使用した.
- Aβ RA-LTMRとAβ SA-LTMRにおける単一作用電位の光遺伝的活性化を使用した.
- 体感皮質とタラムスの ニューロンの反応を記録した
主要な成果:
- 皮質ニューロンは,迅速に適応する (RA) LTMRに似た均質で一時的な反応を示した.
- Aβ RA-LTMRとAβ ゆっくり適応する (SA) -LTMRの両方を破壊すると,軽い触覚に対する皮質の反応は廃止されます.
- 単一のLTMRサブタイプを破壊すると,対照的な感受性のシフトが発生し,二重の貢献が示されました.
結論:
- Aβ RA-LTMRとAβ SA-LTMRは,正常な触覚反応に不可欠である.
- 異なるメカノレセプター信号が統合され,皮質下で変換され,皮質のタッチ表現を生成する.
- この研究は,触覚知覚のための体感覚システム内の広範な信号統合モデルをサポートしています.
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