癌に関連したPTEN変異体は,PTENタンパク質の機能を抑制するために,支配的ネガティブな方法で作用します
Antonella Papa1, Lixin Wan2, Massimo Bonora3
1Cancer Research Institute, Beth Israel Deaconess Cancer Center, Department of Medicine and Pathology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.
Cell
|April 29, 2014
まとめ
PTENタンパク質は,その活性を調節するために二重体を形成します. 癌に関連したPTEN変異は,この機能を損なうことになり,腫瘍の感受性の増加と完全なPTEN喪失に似た効果につながります.
科学分野:
- 分子生物学は分子生物学である.
- 腫瘍学 腫瘍学
- バイオケミストリー バイオケミストリー
背景:
- PTEN (フォスファタゼとテンシンホモログ) は,重要な腫瘍抑制剤である.
- PTEN機能不全は,様々ながんに関与しています.
- PTENの調節を理解することは,がん治療に不可欠です.
研究 の 目的:
- PTENのホモディメリゼーションと,変異形態によるヘテロディメリゼーションが,PTENの活性調節における役割を調査する.
- がんに関連したPTEN変異のインビボの結果を明らかにする.
- 癌の病原性におけるPTEN喪失とPTEN変異の影響を区別する.
主な方法:
- PTENホモディメリゼーションと脂質フォスファタゼ活性の研究のための生化学分析.
- がんに関連した特定の変異 (PtenC124S,PtenG129E) を有するPtenノッキンマウスモデルの生成と分析.
- Ptenノックインマウスの細胞および組織におけるPI3-K/Akt経路活性化の評価.
主要な成果:
- PTENはホモディメリゼスして活性型に変化し,フォスファディチルニノシトール (3,4,5) -トリスホスファート (PtdIns(3,4,5) P3) を脱フォスフォリ化する.
- 触媒的に不活性なPTEN変異体は,野生型PTENと異体化し,その活動を支配的負の方法で抑制する.
- ヘテロジゴト変異を有するPtenノッキンマウスは,PI3-K/Aktの活性化感度が増加し,完全なPten喪失を模倣した腫瘍の予備性が高まったことを示した.
結論:
- PTEN変異と完全なPTEN喪失は,がんの発症における異なるメカニズムである.
- PTEN二酸化は,その腫瘍抑制機能の重要な規制メカニズムです.
- 癌に関連したPTEN変異は支配的に作用し,野生型のPTEN活動に影響を与え,腫瘍発生を促進する可能性があります.
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