Musashi-2 controls cell fate, lineage bias, and TGF-β signaling in HSCs.

Musashi-2 controls cell fate, lineage bias, and TGF-β signaling in HSCs.
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DOI:
10.1084/jem.20130736
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发表时间:
2014-01-13
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Kharas MG
Kharas MG
中科院分区:
其他
文献类型:
--
作者:
Park SM;Deering RP;Lu Y;Tivnan P;Lianoglou S;Al-Shahrour F;Ebert BL;Hacohen N;Leslie C;Daley GQ;Lengner CJ;Kharas MG

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Musashi-2是造血干细胞翻译组的重要调节剂,并平衡HSC稳态和谱系偏好。造血干细胞(HSC)通过调节对称和不对称细胞分裂来维持。我们报告,有条件的消融的RNA结合蛋白Msi 2的结果在失败的HSC的维持和移植所造成的损失的静止和增加的承诺部门。与以前的研究相反,我们发现这些表型与Numb无关。全局转录组分析和RNA靶标分析揭示了Msi 2在控制RNA翻译、干细胞功能和TGF-β信号传导的途径内的多个节点处的相互作用。Msi 2缺失的HSC对TGF-β介导的扩增不敏感,并且具有降低的信号输出,导致骨髓限制性HSC的损失和骨髓重建。因此,Msi 2是HSC翻译组的重要调节剂,并平衡HSC稳态和谱系偏好。
Musashi-2 is an important regulator of the hematopoietic stem cell translatome and balances HSC homeostasis and lineage bias. Hematopoietic stem cells (HSCs) are maintained through the regulation of symmetric and asymmetric cell division. We report that conditional ablation of the RNA-binding protein Msi2 results in a failure of HSC maintenance and engraftment caused by a loss of quiescence and increased commitment divisions. Contrary to previous studies, we found that these phenotypes were independent of Numb. Global transcriptome profiling and RNA target analysis uncovered Msi2 interactions at multiple nodes within pathways that govern RNA translation, stem cell function, and TGF-β signaling. Msi2-null HSCs are insensitive to TGF-β–mediated expansion and have decreased signaling output, resulting in a loss of myeloid-restricted HSCs and myeloid reconstitution. Thus, Msi2 is an important regulator of the HSC translatome and balances HSC homeostasis and lineage bias.
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