The Lkb1 metabolic sensor maintains haematopoietic stem cell survival.

The Lkb1 metabolic sensor maintains haematopoietic stem cell survival.
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DOI:
10.1038/nature09572
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发表时间:
2010-12-02
期刊:
影响因子:
64.8
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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造血干细胞 (HSC) 可以在生物能需求存在显着差异的生长状态之间进行转换。尽管在成人中这些细胞通常处于静止状态,但它们会根据生理需求而增殖。人们对平衡 HSC 能量以响应营养可用性和生长状态知之甚少,但对于造血系统的活力至关重要。在这里,我们证明 Lkb1 肿瘤抑制因子对于维持造血细胞的能量稳态至关重要。成年小鼠中 Lkb1 失活会导致 HSC 失去静止状态,随后所有造血亚群迅速耗尽。 Lkb1 缺陷的骨髓细胞表现出线粒体缺陷、脂质和核苷酸代谢的改变以及细胞 ATP 的消耗。造血作用在很大程度上独立于 Lkb1 对 AMP 激活蛋白激酶 (AMPK) 的调节和哺乳动物雷帕霉素靶标 (mTOR) 信号传导。相反,这些数据定义了 Lkb1 在限制 HSC 进入细胞周期以及通过新的代谢检查点广泛维持造血细胞能量稳态方面的核心作用。
Haematopoietic stem cells (HSCs) can convert between growth states that have marked differences in bioenergetic needs. Although often quiescent in adults, these cells become proliferative upon physiological demand. Balancing HSC energetics in response to nutrient availability and growth state is poorly understood, yet essential for the dynamism of the haematopoietic system. Here we show that the Lkb1 tumour suppressor is critical for the maintenance of energy homeostasis in haematopoietic cells. Lkb1 inactivation in adult mice causes loss of HSC quiescence followed by rapid depletion of all haematopoietic subpopulations. Lkb1-deficient bone marrow cells exhibit mitochondrial defects, alterations in lipid and nucleotide metabolism, and depletion of cellular ATP. The haematopoietic effects are largely independent of Lkb1 regulation of AMP-activated protein kinase (AMPK) and mammalian target of rapamycin (mTOR) signalling. Instead, these data define a central role for Lkb1 in restricting HSC entry into cell cycle and in broadly maintaining energy homeostasis in haematopoietic cells through a novel metabolic checkpoint.
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