レチキュロン3依存型ER-PM接触部位はEGFRの非クラトリン内分泌を制御する
Giusi Caldieri1, Elisa Barbieri1, Gilda Nappo1
1Fondazione Istituto FIRC di Oncologia Molecolare (IFOM), Via Adamello 16, 20139 Milan, Italy.
まとめ
皮質成長因子受容体 (EGFR) は,レチクロン3 (RTN3) とカルシウムシグナル伝達を含む非クラトリン内細胞経路を使用します. このプロセスは,受容体分解と信号衰弱を調節するために,プラズマ膜-ER接触部位を使用します.
科学分野:
- 細胞生物学
- 分子生物学
- 信号経路
背景:
- レセプター信号は内細胞経路によって制御される.
- エピデルマ・成長因子受容体 (EGFR) の非クラトリン内細胞症 (NCE) は,リガンド濃度が高くても受容体を分解し,シグナリングを弱める.
研究 の 目的:
- EGFR-NCE経路の偏見のない分子特徴付けを行う.
- EGFR-NCEに関与する新しいレギュレータとメカニズムを特定する.
主な方法:
- EGFR-NCEの偏らない分子特性
- NCE特有の規制装置と貨物の特定
- 血とERの接触部位とカルシウム信号の分析
主要な成果:
- レチキュロン3 (RTN3) とCD147は,NCE特有の調節物質と貨物として特定されました.
- RTN3は,NCEの侵入形成/成熟に不可欠な血 (PM) - ER接触部位を促進する.
- イノシトール1,4,5-トリスホスファート (IP3) によるPM- ER接触部位でのCa2+放出はEGFR内部化のために必要である.
結論:
- NCEによるEGFR内細胞化の新しいメカニズムが特定されました.
- この経路は,ER-PM接触部位とローカルCa2+シグナリングにより,受容体の内部化とシグナリングの弱化に依拠しています.
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