エリトロポエチンと幹細胞因子受容体の相互作用

H Wu¹, U Klingmüller, P Besmer

¹Whitehead Institute for Biomedical Research, Cambridge, Massachusetts 02142, USA.

Nature

|September 21, 1995

まとめ

KIT受容体チロシンキナーゼの変異は,赤血球の産生を妨害する. 幹細胞因子 (SCF) は,EPO受容体を活性化し,赤色素原体の増殖と生存を促進します.

科学分野:

血液学ヘマトロジ
分子生物学は分子生物学である.
細胞シグナル伝達細胞信号伝達

背景:

KIT受容体チロシンキナーゼの変異は,エリトロポエーゼを阻害し,赤色素原始体 (CFU-E) の減少につながります.
CFU-Eの生存と増殖は,エリトロポエチン (EPO) 信号伝送に極めて依存しています.
KITがCFU-Eの拡散と分化に影響を与える正確なメカニズムは不明である.

研究の目的:

エリソイド前駆細胞におけるKITとEPO受容体シグナル伝達の機能的関係を調査する.
KITシグナリングが,赤色素原体の増殖と成熟にどのように影響するか解明する.

主な方法:

利用されたHCD57細胞は,KITを発現するEPO依存性赤色素原始細胞系である.
幹細胞因子 (SCF) が細胞の成長,生存,およびEPO受容体リン酸化に及ぼす影響を評価した.
共同免疫プレシピテーションを用いてKITとEPO受容体の物理的関連性を調査した.

主要な成果:

幹細胞因子 (SCF) は,HCD57細胞の成長と生存をサポートし,EPOの必要性を置き換えました.
SCFは,EPO受容体も発現している場合にのみ,KIT発現する32D細胞の増殖を促した.
SCFはHCD57細胞におけるEPO受容体のチロシンリン酸化を迅速に誘導した.
KITは,EPO受容体の細胞質領域と物理的に結合することが判明しました.

結論:

KIT信号は,EPO受容体経路を活性化することができます.
KITは,EPO受容体チロシンリン酸化を通じて,赤色素原体の増殖と成熟を促進する可能性があります.
この相互作用は,KITとEPOの信号伝達におけるエリソポエーゼスの間の重要なクロストークを強調しています.

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