AMPK调节NADPH稳态,在能量压力期间促进瘤细胞存活
Sang-Min Jeon1, Navdeep S Chandel, Nissim Hay
1Department of Biochemistry and Molecular Genetics, College of Medicine, University of Illinois at Chicago, Chicago, Illinois 60607, USA.
Nature
|June 5, 2012
概括
通过调节NADPH水平,AMPK激活有助于癌细胞在代谢压力下生存. 这一途径对于瘤生长和在能量有限的条件下生存至关重要.
科学领域:
- 细胞生物学 细胞生物学
- 代谢调节 代谢调节 代谢调节
- 癌症研究 癌症研究
背景情况:
- 代谢压力对固体瘤生长至关重要,但细胞死亡和生存的机制尚不清楚.
- 肝激酶B1 (LKB1) -AMP激活蛋白激酶 (AMPK) 途径是代谢适应的关键.
- 缺乏LKB1或AMPK的细胞表现出对瘤转化和瘤发生的抵抗力.
研究的目的:
- 阐明AMPK促进瘤细胞代谢适应的机制.
- 研究AMPK在代谢压力下细胞存活中的作用.
- 了解AMPK在维持癌细胞存活的NADPH中的作用.
主要方法:
- 在能量压力期间研究了AMPK激活.
- 分析了NADPH生成和消耗途径.
- 研究了乙-CoA碳氧酶 (ACC1和ACC2) 在AMPK介导作用中的作用.
- 利用基因淘汰和激活实验.
- 评估了无位的生长和体内固体瘤的形成.
主要成果:
- 在能量应激下,AMPK激活通过氧化还原调节延长了细胞生存时间.
- 当酸通路受损时,AMPK会诱导其他途径来维持NADPH.
- AMPK抑制了ACC1和ACC2,降低了NADPH消耗并增加了其生成.
- 击败ACC1/ACC2模仿AMPK激活,促进瘤的生长.
- ACC1/ACC2激活减弱了瘤的生长.
结论:
- 通过维持NADPH水平,AMPK在能量压力下对癌细胞生存至关重要.
- AMPK的作用超越了ATP平衡,包括必要的NADPH维护.
- 准AMPK-ACC通路可能为癌症提供治疗策略.
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