Bleb は 腫瘍 信号 センター を 組み立て て 細胞 の 生存 を 促進 する
Andrew D Weems1, Erik S Welf2,3, Meghan K Driscoll2,4
1Lyda Hill Department of Bioinformatics, UT Southwestern Medical Center, Dallas, TX, USA. Andrew.Weems@UTSouthwestern.edu.
Nature
|March 1, 2023
まとめ
細胞の小さな突起は 癌細胞にアノイキスという プログラムされた細胞死に対する抵抗力を 与える信号のハブを形成します この発見は 癌の進行に対する 新しい生存メカニズムを明らかにしています
科学分野:
- 細胞生物学
- 癌 研究
- 分子信号
背景:
- 細胞の生存には通常,基板への粘着が必要で,脱離はアノイキス (プログラムされた細胞死) に至る.
- がん細胞は,往々にして円形の形状をとり,血膜の塊を形成することで,転移の重要なステップであるアノイキス抵抗性を獲得する.
- 特にアノイキの耐性における,非移動環境におけるブレブの正確な機能は,まだ十分に研究されていない.
研究 の 目的:
- アノイキに耐性を与える プラズマ膜の血栓の役割を調べる
- 脱離状態での細胞生存を促進する分子メカニズムを解明する.
- ガンにおける血栓媒介信号の治療の可能性を探る
主な方法:
- 細胞の形状の3次元画像と操作
- 信号経路の活性化 (ERK,PI3K,MAPK) の分析
- ブレブ関連信号ハブにおけるセプチンタンパク質と変異したNRASの役割を調査する.
- 分離した癌細胞と線維芽細胞における血栓とセプチンの薬理学的抑制.
- ブレブ依存生存に対するBRAFとMEK抑制の影響を評価する.
主要な成果:
- プラズマ膜のシグナリングハブの形成を誘導し,活性変異性NRASとそのエフェクタを支えるためのセプティンを勧誘する.
- これらのシグナルハブは ERKとPI3K経路を活性化し 生存のためのシグナリングを促進します
- 脱離した細胞におけるブレブまたはセプチンの抑制は,NRASの誤局化,MAPK/ PI3Kの活性低下,および細胞死につながる.
- BRAFとMEKの結合阻害により,BRAF変異のメラノーマ細胞はブレブ/セプチン阻害に敏感になる.
- がん細胞に似た耐性を 発現させるように設計された線維細胞は 腫瘍性変異はなくとも
結論:
- プラズマ膜の塊は,生存のための経路を組織することによって,アノイキに抵抗を与える信号器官として機能する.
- 変異したNRASの腫瘍学的機能には必要不可欠です.
- ブレブ媒介信号をターゲットにすることが,特に併用療法において,がんに対する潜在的な治療戦略です.
- Blebsは腫瘍性変異とは無関係にアノイキスに耐性を与えることができ,細胞生存における基本的な役割を強調しています.
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