ミトゲンシグナル伝達に障害がある変異したCSF-1受容体のMyc救出
M F Roussel1, J L Cleveland, S A Shurtleff
1Department of Tumor Cell Biology, St. Jude Children's Research Hospital, Memphis, Tennessee 38105.
Nature
|September 26, 1991
まとめ
コロニー刺激因子-1受容体 (CSF-1R) のシグナル伝達経路は,チロシン809がc-myc誘導と細胞増殖に不可欠であることから,二分化します. これは,CSF-1主導の細胞成長におけるc-mycの中心的な役割を強調しています.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- シグナルトランスデュークション
背景:
- コロニー刺激因子-1受容体 (CSF-1R) のシグナル伝達は,チロシンキナーゼ活性と細胞内エフェクターを含む複雑なものです.
- リン酸化部位近くの特定の配列モチーフは,細胞プラズマのシグナリング分子との相互作用を媒介する.
研究 の 目的:
- CSF-1Rシグナル伝達におけるチロシン809の自己リン酸化部位の役割を調査する.
- 下流のシグナリングイベント,特にCSF-1-誘発ミトゲネシスにおけるc-mycの関与を明らかにする.
主な方法:
- タイロシン809.9のCSF-1R自己リン酸化部位のサイト指向性変異.
- 野生型または変異型CSF-1Rを発現するNIH3T3細胞を,血清フリーミディアで培養する.
- CSF-1への反応として細胞増殖,コロニー形成,c-myc mRNA誘導を評価する.
主要な成果:
- チロシン809の変異は,CSF-1Rのチロシンキナーゼ活性や,フォスファディチルニノシトール3キナーゼとの結合に有意な影響を及ぼさなかった.
- 変異したCSF-1R ((Phe 809) を含む細胞は,CSF-1への反応として,増殖とコロニー形成の障害を示した.
- 変異細胞では,c-myc mRNAのCSF-1誘導が著しく低下したが,強制的なc-myc発現によって回復することができた.
結論:
- CSF-1Rのシグナル伝達は2つに分裂し,すぐれた初期の遺伝子応答とミトゲネシスを調節する明確な経路を持つ.
- タイロシン809は,CSF-1Rの活性化とc-myc誘導と,その後の細胞増殖の結合において重要な役割を果たします.
- c-mycは,CSF-1誘発のミトゲネシスに不可欠であり,受容体チロシンキナーゼの活動に下流的に作用する.
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