BFU-EとCFU-Eの遺伝子の生成には,エリトロポエチンやエリトロポエチン受容体が不要である
H Wu1, X Liu, R Jaenisch
1Whitehead Institute for Biomedical Research, Cambridge, Massachusetts 02142, USA.
Cell
|October 6, 1995
まとめ
エリトロポエチン (EPO) とその受容体 (EPO-R) のゼロ変異は,決定的なエリトロポエシスが失敗したため,胚の致死性を引き起こします. EPOとEPO-Rは胎児の赤血球生成と生存に不可欠である.
科学分野:
- 血液学 ヘマトロジ
- 発達生物学 発達生物学とは
- 遺伝学 遺伝学とは
背景:
- エリソポエチン (EPO) は,赤血球の生産の重要な調節剤です.
- EPO受容体 (EPO-R) は,EPOの生物学的効果を媒介する.
- エリトロポエーゼにおけるEPOとEPO-Rの役割を理解することは極めて重要です.
研究 の 目的:
- エリソポエシス中のEPOとEPO-Rのインビヴォ機能を調査する.
- 代替リガンドや受容体がEPO/EPO-Rの損失を補うことができるかどうかを判断する.
主な方法:
- EpoとEpoRの両方の遺伝子でゼロ変異を持つマウスの世代.
- ヘテロゾイゴスおよびホモゾイゴス変異動物におけるエリトロポエーシスの分析.
- 胚の発達中の原始的および最終的なエリトロポエーシスの評価.
主要な成果:
- ホモジゴスなEpoとEpoRのヌル変異は,13日頃の胚死亡率を含む,同一のフェノタイプをもたらした.
- ミュータント胚は原始性エリソポエーシスが低下し,胎児肝臓エリソポエーシスが失敗した.
- エリトロイド原始体 (BFU-E,CFU-E) が存在し,EPO/EPO-Rは系統のコミットメントまたは初期の原始体増殖/差別化のために必要とされていないことを示しています.
- EPOとEPO-Rは,CFU-Eの増殖,生存,および in vivo の末端分化に不可欠です.
結論:
- EPOとEPO-Rは,in vivoの決定的なエリトロポエーゼにとって不可欠である.
- 他のリガンドや受容体による補償メカニズムは観察されなかった.
- EPOのシグナル伝達は,赤血球の発達,特にCFU-Eの成熟と生存の遅い段階で非常に重要です.
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