The telomere binding protein Pot1 maintains haematopoietic stem cell activity with age.

The telomere binding protein Pot1 maintains haematopoietic stem cell activity with age.
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DOI:
10.1038/s41467-017-00935-4
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发表时间:
2017-10-06
影响因子:
16.6
通讯作者:
Arai F
Arai F
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Hosokawa K;MacArthur BD;Ikushima YM;Toyama H;Masuhiro Y;Hanazawa S;Suda T;Arai F

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重复的细胞分裂和衰老损害干细胞功能。然而,这种情况发生的机制尚未完全了解。在这里,我们表明,保护端粒1A(Pot 1a),保护端粒的Shelterin复合物的一个组成部分,在衰老过程中提高造血干细胞(HSC)的活性。Pot 1a在年轻的HSC中高度表达,但随着年龄的增长而下降。在小鼠HSC中,Pot 1a敲低增加DNA损伤反应(DDR)并抑制自我更新。相反,Pot 1a过表达或用POT 1a蛋白处理可防止DDR,维持自我更新活性,并在离体培养时使老化的HSC恢复活力。此外,用外源性Pot 1a处理HSC抑制活性氧的产生,表明Pot 1a在HSC维持中的非端粒作用。与这些结果一致,用外源性人POT 1蛋白处理维持了培养物中的人HSC活性。总的来说,这些结果表明,Pot 1a/POT 1维持HSC活性,并可用于体外扩增HSC数量。重复的细胞分裂会诱导造血干细胞(HSC)的DNA损伤,而端粒对这种损伤很敏感。在这里,作者在小鼠HSC中表明,端粒结合蛋白POT 1a抑制活性氧的产生,并使老化的HSC恢复活力。
Repeated cell divisions and aging impair stem cell function. However, the mechanisms by which this occurs are not fully understood. Here we show that protection of telomeres 1A (Pot1a), a component of the Shelterin complex that protects telomeres, improves haematopoietic stem cell (HSC) activity during aging. Pot1a is highly expressed in young HSCs, but declines with age. In mouse HSCs, Pot1a knockdown increases DNA damage response (DDR) and inhibits self-renewal. Conversely, Pot1a overexpression or treatment with POT1a protein prevents DDR, maintained self-renewal activity and rejuvenated aged HSCs upon ex vivo culture. Moreover, treatment of HSCs with exogenous Pot1a inhibits the production of reactive oxygen species, suggesting a non-telomeric role for Pot1a in HSC maintenance. Consistent with these results, treatment with exogenous human POT1 protein maintains human HSC activity in culture. Collectively, these results show that Pot1a/POT1 sustains HSC activity and can be used to expand HSC numbers ex vivo. Repeated cell divisions induce DNA damage in haematopoietic stem cells (HSC) and telomeres are sensitive to this damage. Here, the authors show in murine HSCs that the telomere binding protein POT1a inhibited the production of reactive oxygen species, and rejuvenated aged HSCs.
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