Blood:染色质结合蛋白Phf6可限制造血干细胞自我更新

2019-04-14 MedSci MedSci原创

在各种血液病恶性肿瘤中,在X-连锁的PHF6基因上发现重复性的失活突变;PHF6基因编码一种染色质结合转录调节蛋白。但PHF6在正常造血中的作用以及其对肿瘤的抑制作用尚未完全明确。Satoru Miyagi等研究人员建立一种携带漂浮的Phf6等位基因的小鼠,并可在不同发育阶段的造血细胞中失活Phf6。胚胎中Phf6缺失可增强造血干细胞(HSCs)在体外增殖和在受体小鼠中重建造血的能力。新生鼠和成年

在各种血液病恶性肿瘤中,在X-连锁的PHF6基因上发现重复性的失活突变;PHF6基因编码一种染色质结合转录调节蛋白。但PHF6在正常造血中的作用以及其对肿瘤的抑制作用尚未完全明确。

Satoru Miyagi等研究人员建立一种携带漂浮的Phf6等位基因的小鼠,并可在不同发育阶段的造血细胞中失活Phf6。胚胎中Phf6缺失可增强造血干细胞(HSCs)在体外增殖和在受体小鼠中重建造血的能力。

新生鼠和成年鼠缺失Phf6表现为,循环的HSCs容易获得竞争性再种群优势,而休眠的HSCs仅在连续移植后才获得竞争性再种群优势。

Phf6缺陷的HSCs在连续移植过程中可保持较强的再生能力;而且不会诱发任何恶性血液肿瘤。

在机制上,Phf6可直接和间接的激活TNFα信号通路中的下游效应器。敲除Phf6可抑制一些列与TNFα信号相关的基因表达,进而抵抗TNFα介导的对HSCs的生长抑制。

综上所述,本研究表明Phf6可能是HSC自我更新的一种新的负调节因子,提示PHF6的失活性突变可能参与恶性血液肿瘤的发生,但仅有PHF6缺陷并不足以诱导造血细胞转化。

原始出处:

Satoru Miyagi,et al.The chromatin binding protein Phf6 restricts the self-renewal of hematopoietic stem cells.Blood 2019 :blood.2019000468; doi: https://doi.org/10.1182/blood.2019000468 

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    2019-04-16 俅侠
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    2019-04-15 txqjm

    谢谢了,学习

    0