網膜芽細胞腫タンパク質とオンコタンパク質MDM2の相互作用

Z X Xiao¹, J Chen, A J Levine

¹Dana-Farber Cancer Institute, Boston, Massachusetts 02115, USA.

Nature

|June 22, 1995

まとめ

プロトオンコゲンMDM2は,p53とレチノブラストーマタンパク質 (pRB) の腫瘍抑制機能の両方を否定的に調節する. この相互作用は,単一の腫瘍遺伝子を強調しています.

科学分野:

腫瘍学腫瘍学
分子生物学は分子生物学である.
遺伝学遺伝学とは

背景:

腫瘍抑制遺伝子,特にp53および網膜芽細胞腫 (RB) 遺伝子の不活性化は,ヒトの癌発症において極めて重要です.
RBとp53の同時無効化は,様々なヒト腫瘍において一般的です.
DNA腫瘍ウイルスは,p53およびRBタンパク質を標的にし,無活性化させます.

研究の目的:

細胞のオンコタンパク質Mdm2と網膜芽細胞腫タンパク質 (pRB) の相互作用を調査する.
Mdm2がpRBの成長調節機能に影響するかどうかを,p53.3に対する既知の効果に類似して判断する.

主な方法:

MDM2とpRB.との間の物理的,機能的相互作用を測定する.
pRBの成長規制能力に対するMDM2の影響の評価.

主要な成果:

MDM2はpRBと物理的に相互作用する.
MDM2は,pRB.の成長調節機能を機能的に抑制する.
これは,pRBとp53の両方がMDM2原発がん遺伝子の産物によって否定的に調節されていることを示しています.

結論:

プロトオンコゲンMDM2は,p53とpRBの2つの主要な腫瘍抑制剤を否定的に調節することによって,癌において重要な役割を果たします.
単一の腫瘍遺伝子製品は,複数の腫瘍抑制タンパク質の機能を同時に標的にし,抑制することができ,腫瘍発生における統一されたメカニズムを提供します.

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