静止性シリアは,左から右に流れる液体の方向を機械的に感知する
Takanobu A Katoh1,2, Toshihiro Omori3, Katsutoshi Mizuno1
1Laboratory for Organismal Patterning, RIKEN Center for Biosystems Dynamics Research, Kobe, Hyogo, Japan.
まとめ
ネズミの胚の不動性シリアは 非対称に変形することで 流体の流れ方向を感知します この変形はカルシウム信号と 遺伝子発現の変化を誘発し 左と右の身体の対称性を 破るメカニズムを明らかにします
科学分野:
- 発達生物学
- バイオ物理学
- 細胞生物学
背景:
- 脊椎動物胚の左-右の不対称性は,腹節の液体流によって確立される.
- 結節の不動性シリアが この液体の流れを感知するメカニズムは 明らかになっていません
- このメカニズムを理解することは 初期の胚の発達と対称性の破綻を理解するために 極めて重要です
研究 の 目的:
- 静止性シリアによる流動感知の生体物理的メカニズムを解明する.
- シリアの変形が 細胞信号に変換され 左-右の対称性を破る方法を 調べるため
主な方法:
- 精密な機械的刺激を マウス胚の不動毛に施すための光学ピンチを使用しました
- カルシウムイオントランジエントとメッセンジャーRNA (mRNA) の分解を含む細胞反応のモニタリング.
- 内におけるPkd2チャネルタンパク質の局所化と機能を研究した.
主要な成果:
- 動かないシリアは,流体の流れに反応して,背中軸に沿って不対称な変形を示します.
- カルシウムイオントランジエントを誘発し,Dand5 mRNAを分解する.
- Pkd2タンパク質は背面部に局所され,刺激は腹部に偏ってカルシウム信号を誘導する.
結論:
- 静止性シリアの非対称的変形は 流体の流れ方向を感知する 重要な生体物理的メカニズムです
- このシリアによる方向感知は,カルシウムトランジエントとmRNAの調節を含む下流のシグナル伝達経路を開始します.
- 発見は,胚の発達中に結節シリアが左右対称性を破る方法について包括的な理解を提供します.
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