MLLT3はヒトの造血幹細胞の自己再生と移植を制御する
Vincenzo Calvanese1,2, Andrew T Nguyen3, Timothy J Bolan3
1Department of Molecular, Cell and Developmental Biology, University of California Los Angeles, Los Angeles, CA, USA. vincalv@gmail.com.
Nature
|November 29, 2019
まとめ
MLLT3 (AF9) は,培養中のヒト造血幹細胞 (HSC) の維持に不可欠である. MLLT3の発現を安定させることで,移植のためのHSCの重要な拡張が可能になり,再生医療における重要な課題に取り組んでいます.
科学分野:
- 血液学
- 幹細胞生物学
- 分子生物学
背景:
- ヒトの造血幹細胞 (HSC) の自己再生は十分に理解されていない.
- HSCが培養中に機能を維持できないと,移植のための拡張を制限する.
研究 の 目的:
- 文化におけるHSCの自己更新と維持の重要な規制者を特定する.
- 人間のHSC機能におけるMLLT3 (AF9) の役割を調査する.
主な方法:
- 人間のHSC (胎児,新生児,成人) と培養物のMLLT3発現の定量分析
- MLLT3の減退と過剰発現は,血液形成幹細胞と原始細胞 (HSPC) に見られる.
- HSPCの維持,拡張,および多線形復元 in vivo (マウスモデル) の評価
- MLLT3の局所化とヒストン変異 (H3K79me2) に対する影響を決定するクロマチンの免疫プレシピテーション
主要な成果:
- MLLT3はヒトのHSCで高い濃度で発現するが,培養では低下している.
- MLLT3の減少は,移植可能なHSPCの維持を in vitroで妨げます.
- MLLT3の発現を安定させることで,移植可能なHSCの12倍以上の膨張が生じます.
- 拡張されたHSCは,主および二次マウスの受容体でバランスのとれた多系復元を示しています.
- MLLT3は活性プロモーターに局所化し,H3K79me2レベルを維持し,培養物におけるHSC転写プログラムを維持する.
結論:
- MLLT3はHSC維持の重要な要素として機能します.
- MLLT3はヒストンの改変経路とHSC遺伝子発現の調節を結びつける.
- MLLT3は,治療的移植のためのHSCを拡大するための有望なターゲットです.
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