Id2は網膜芽細胞瘤のタンパク質標的であり,Mycオンコプロテインによるシグナル伝達を媒介する
A Lasorella1, M Noseda, M Beyna
1Department of Neurology, Albert Einstein College of Medicine, Bronx, New York 10461, USA.
Nature
|October 18, 2000
まとめ
Id2および網膜芽細胞腫 (Rb) タンパク質は細胞の成長を調節する. 通常,RbはId2を阻害するが,MycオンコプロテインはId2を活性化し,Rbを覆す.
科学分野:
- 細胞生物学 細胞生物学
- 分子腫瘍学は分子腫瘍学である.
- 発達生物学 発達生物学とは
背景:
- Idタンパク質は,哺乳類の細胞増殖と分化の主な調節因子である.
- Id2は,基本的なヘリックス・ループ・ヘリックス転写因子および網膜芽細胞腫 (Rb) タンパク質の支配的負の阻害剤として作用する.
- Id2とRbの相互作用の調節不良は,細胞プロセスと癌に関与しています.
研究 の 目的:
- 哺乳類の発達と癌におけるId2とRbの機能的関係を調査する.
- ニューロブラストーマにおけるId2の役割,特にN-myc増幅に関連して解明する.
- MycオンコプロテインがId2-Rb軸にどのように影響するかを理解する.
主な方法:
- Id2-Rbのダブルノックアウトマウス胚の生成と分析.
- 異なるN-myc複製数のニューロブラストーマ細胞系におけるId2発現とRb相互作用の調査.
- Mycファミリーのオンコタンパク質によるId2の転写調節の分析.
主要な成果:
- Id2-Rbのダブル・ノックアウト胚は正常なニューロゲネシスと血液形成を示すが,重度の筋肉組織減少のために出生時に死亡する.
- Id2は,余分なN-myc遺伝子コピーを持つニューロブラストーマ細胞で過剰発現し,Id2が活性Rbを上回る.
- Mycオンコプロテインは転写的にId2を活性化し,この経路はRb不活性化によるMyc誘発細胞サイクル進行に不可欠である.
結論:
- Id2 と Rb は二重の規制関係にあり,Rb は通常 Id2 の行動に反対する.
- Myc-Id2経路の腫瘍性活性化は,Rbの腫瘍抑制機能を覆し,神経芽細胞腫の発症における重要なメカニズムを強調する.
- Id2-Rb軸は,正常な筋肉の発達に不可欠であり,その調節障害は腫瘍形成に寄与する.
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Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
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