Bmi1 suppresses protein synthesis and promotes proteostasis in hematopoietic stem cells.

Bmi1 suppresses protein synthesis and promotes proteostasis in hematopoietic stem cells.
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DOI:
10.1101/gad.349917.122
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发表时间:
2022-08-01
影响因子:
10.5
通讯作者:
Morrison, Sean J.
Morrison, Sean J.
中科院分区:
生物学1区
文献类型:
--
作者:
Burgess, Rebecca J.;Zhao, Zhiyu;Nakada, Daisuke;Morrison, Sean J.

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在这项研究中,伯吉斯等人。从成体造血细胞中有条件地删除 Bmi1,发现这会缓慢耗尽造血干细胞 (HSC),并且 Bmi1 缺陷不会诱导衰老,反而会增加 HSC 分裂。总体而言,他们发现 Bmi1 通过负向调节 ARX 表达来促进 HSC 静止,并通过抑制蛋白质合成来促进蛋白质稳态。多梳复合体成分 Bmi1 促进多个出生后组织中干细胞的维持,部分是通过负调节 p16Ink4a 和 p19Arf(与细胞衰老相关的肿瘤抑制因子)的表达来实现的。然而,p16Ink4a 和 p19Arf 的缺陷只能部分挽救 Bmi1 缺陷干细胞的功能。我们有条件地从成体造血细胞中删除 Bmi1,发现这会缓慢耗尽造血干细胞 (HSC)。 Bmi1 缺陷不是诱导衰老,而是增加 HSC 分裂。细胞分裂增加的部分原因是 Aristaless 相关同源盒 (ARX) 转录因子表达增加,这也增加了核糖体 RNA 表达。然而,ARX 缺乏并不能挽救 HSC 耗竭。 Bmi1 缺陷还会增加蛋白质合成、蛋白质聚集和蛋白质泛素化,而与其对细胞分裂和 p16Ink4a、p19Arf 和 A​​RX 表达的影响无关。因此,Bmi1 通过负向调节 ARX 表达来促进 HSC 静止,并通过抑制蛋白质合成来促进蛋白质稳态。这凸显了干细胞维持和蛋白质稳态调节之间的新联系。
In this study, Burgess et al. conditionally deleted Bmi1 from adult hematopoietic cells and found that this slowly depleted hematopoietic stem cells (HSCs) and that, rather than inducing senescence, Bmi1 deficiency increased HSC division. Overall, they found that Bmi1 promotes HSC quiescence by negatively regulating ARX expression and promoting proteostasis by suppressing protein synthesis. The polycomb complex component Bmi1 promotes the maintenance of stem cells in multiple postnatal tissues, partly by negatively regulating the expression of p16Ink4a and p19Arf, tumor suppressors associated with cellular senescence. However, deficiency for p16Ink4a and p19Arf only partially rescues the function of Bmi1-deficient stem cells. We conditionally deleted Bmi1 from adult hematopoietic cells and found that this slowly depleted hematopoietic stem cells (HSCs). Rather than inducing senescence, Bmi1 deficiency increased HSC division. The increased cell division was caused partly by increased Aristaless-related homeobox (ARX) transcription factor expression, which also increased ribosomal RNA expression. However, ARX deficiency did not rescue HSC depletion. Bmi1 deficiency also increased protein synthesis, protein aggregation, and protein ubiquitylation independent of its effects on cell division and p16Ink4a, p19Arf, and ARX expression. Bmi1 thus promotes HSC quiescence by negatively regulating ARX expression and promotes proteostasis by suppressing protein synthesis. This highlights a new connection between the regulation of stem cell maintenance and proteostasis.
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