穆沙希-2 减弱了 AHR 信号以扩大人类造血干细胞

穆沙希-2 减弱了 AHR 信号以扩大人类造血干细胞

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Stefan Rentas¹, Nicholas Holzapfel¹, Muluken S Belew¹

¹Department of Biochemistry and Biomedical Sciences, Stem Cell and Cancer Research Institute, McMaster University, Hamilton, ON, Canada.

Nature

|April 29, 2016

概括

过度表达的Musashi-2 (MSI2) 显著扩大人造血干细胞 (HSCs),用于再生疗法. 这种RNA结合蛋白通过降低基受体 (AHR) 信号来增强HSC的自我更新.

科学领域:

干细胞生物学
自己更新的分子机制
复原医学

背景情况:

带血中的造血干细胞对于再生疗法至关重要,但数量有限.
现有扩展HSC的方法往往缺乏机理性理解.
与转录因子相比,HSC命运的转录后调节仍未得到充分研究.

研究的目的:

研究RNA结合蛋白在人类HSC自我更新中的作用.
确定HSC中RNA结合蛋白调节的分子标和途径.
探索用于治疗应用的HSC体外扩展策略.

主要方法:

在人带血的造血干细胞和前代细胞 (HSPCs) 中过度表达RNA结合蛋白Musashi-2 (MSI2).
评估HSC的自我更新和重新填充能力.
使用CLIP-seq等技术对MSI2-RNA相互作用进行全球分析.
定量化正规的基碳水化合物受体 (AHR) 途径组件.

主要成果:

由于MSI2的过度表达,短时间的复合细胞增加了17倍,长期的复合细胞增加了23倍.
显示MSI2可以直接减弱AHR信号.
在带血液HSPC中证实了MSI2对AHR途径组件的转录后降低.

结论:

在促进HSC自我更新方面,MSI2发挥着至关重要的作用.
MSI2通过后转录降低AHR信号来调节HSC命运.
针对RNA结合蛋白网络,如MSI2-AHR相互作用,为增强再生医学的HSC扩展提供了一个有希望的策略.

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