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EGF受容体に対するキナーゼ独立の役割が,オートファギーの開始に起因する
Xiaojun Tan1, Narendra Thapa1, Yue Sun1
1Program in Molecular and Cellular Pharmacology, University of Wisconsin-Madison School of Medicine and Public Health, 1300 University Avenue, Madison, WI 53706, USA.
Cell
|January 17, 2015
まとめ
非活性な表皮成長因子受容体 (EGFR) は,LAPTM4BとSec5.5との相互作用により,オートファギーを開始します. この経路は,腫瘍細胞の代謝とストレス中の生存を調節する.
科学分野:
- 細胞生物学 細胞生物学
- がん研究 がん研究
- 分子腫瘍学は分子腫瘍学である.
背景:
- 皮膜成長因子受容体 (EGFR) は,ヒトのがんではしばしば上調される.
- EGFRのシグナル伝達阻害は,腫瘍細胞のオートファギーを引き起こす可能性があります.
研究 の 目的:
- オートファギーの開始における不活性EGFRの役割を調査する.
- 非活性EGFRとオートファギーを結びつける分子メカニズムを解明する.
主な方法:
- コイムノプレシピテーションアッセイは,タンパク質の相互作用を研究するためのものです.
- タンパク質レベルとオートファギーのマーカーを評価するためのウェスタン・ブロッティング.
- タンパク質の局所化を視覚化するための免疫光顕微鏡.
主要な成果:
- 非活性EGFRは,血清飢餓中にEGFRの内分体蓄積に不可欠なオンコタンパク質LAPTM4Bと相互作用する.
- 非活性EGFR,LAPTM4B,およびSec5サブコンプレックスは,基礎的および飢餓誘発的自菌の両方にとって不可欠です.
- LAPTM4BとSec5は,EGFRとRubiconの結合を促進し,Beclin 1の放出とオートファギーの開始につながります.
結論:
- オンコタンパク質LAPTM4Bは,オートファギーの開始における不活性EGFRの役割を媒介する.
- 非活性EGFR,LAPTM4B,Sec5を含むこの新たに特定された経路は,腫瘍細胞の代謝と代謝ストレス下での生存を調節する.
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