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Lkb1代谢传感器维持了血造干细胞的生存率
Sushma Gurumurthy1, Stephanie Z Xie, Brinda Alagesan
1Cancer Center and Center for Regenerative Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02114, USA.
Nature
|December 3, 2010
概括
Lkb1瘤抑制剂对于维持血造干细胞 (HSC) 中的能量平衡至关重要. Lkb1的损失破坏了HSC的静止状态,并导致血液细胞群体的快速枯竭,突出了一个新的代谢检查点.
科学领域:
- 血液学 血液学 血液学
- 细胞的新陈代谢
- 癌症生物学 癌症生物学
背景情况:
- 造血干细胞 (HSC) 在不同的生长状态中表现出不同的生物能量需求,根据生理需求从静止转向增殖.
- 维持HSC中的能量稳定对于造血系统的动态性质至关重要,但仍然不太了解.
- 营养素的可用性和生长状态显著影响HSC能量.
研究的目的:
- 为了研究Lkb1瘤抑制剂在维持血液细胞内能量恒温的作用.
- 阐明 Lkb1 影响 HSC 功能和生存的机制.
主要方法:
- 在成年小鼠中,Lkb1瘤抑制剂的失活.
- 对HSC静止,造血细胞种群和骨髓细胞性进行分析.
- 评估线粒体功能,脂质和核酸代谢以及Lkb1缺乏细胞中的ATP水平.
主要成果:
- 成年小鼠中的Lkb1无活化导致HSC静止的丧失和所有造血子群的快速耗尽.
- 缺乏lkb1的骨髓细胞表现出线粒体缺陷,改变了脂质和核酸代谢,并降低了ATP水平.
- 观察到的造血效应在很大程度上独立于Lkb1已知调节AMP激活蛋白激酶 (AMPK) 和哺乳动物目标拉巴胺素 (mTOR) 信号传输.
结论:
- Lkb1对于维持血液细胞的能量恒温至关重要.
- Lkb1通过一种新的代谢检查点作用,限制HSC进入细胞循环.
- 这些发现确定了Lkb1在调节HSC功能和整体造血系统稳定性方面之前未知的作用.
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