喉の渇きを制御する階層的な神経構造
Vineet Augustine1,2, Sertan Kutal Gokce2, Sangjun Lee2
1Computation and Neural Systems, California Institute of Technology, Pasadena, California, USA.
Nature
|March 1, 2018
まとめ
研究者はマウスの神経回路の階層構造を発見し ホメオスタティックなニーズと 飲酒行動を統合することで 喉の渇きを調節します この回路は特定のニューロンを用いて 液体の摂取と飽和を制御し 水のバランスを維持します
科学分野:
- 神経科学
- 生理学
背景:
- 食欲の調節には ホメオスタティック信号と 摂食行動が含まれます
- 喉の渇きを誘発する神経回路の仕組みは 明らかになっていません
研究 の 目的:
- ネズミの喉の渇きを 制御する神経回路の構造を解明する
- 内外的な刺激が 飲酒行動を制御する仕組みを理解する
主な方法:
- ラミナ・ターミナルの神経回路を調査するために マウスモデルを使用した.
- 特定のニューロン集団の機能 (例えば,酸化窒素合成酵素とGLP1Rを発現するニューロン) を研究するために遺伝的操作を使用した.
- ニューラル活動と 飲み物の摂取に対する反応を 監視した.
主要な成果:
- 喉の渇きを制御する 階層的な回路を特定した
- 中央視前核 (MnPO) の酸化窒素合成酵素を発現するニューロンが,サブフォリニカル臓器 (SFO) の渇望ニューロンからの信号を統合することを実証した.
- グルカゴンのようなペプチド1受容体 (GLP1R) を発現するMnPO GABAergicニューロンを含む抑制回路が明らかにされ,SFOの渇望ニューロンを飲んだときに抑制する.
- これらの阻害反応は,水分摂取に特異的であり,飲酒開始/オフセットに時間的に固定されていることが示されました.
- GLP1Rを発現するMnPOニューロンの機能喪失が過剰飲酒 (ポリディプシア) を引き起こすことがわかりました.
結論:
- ラミナ・ターミナルの神経群は 渇きを調節する階層的な回路を形成します
- GLP1Rを発現するMnPOニューロンは,リアルタイムで水分摂取を監視することで,渇きを迅速に満たす上で重要な役割を果たします.
- この回路は 液体の必要性を 飲料行動に動的に統合して 水のバランスを維持します
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