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通过阻断翻译延长,eEF2激酶赋予了对营养缺乏的抵抗力
Gabriel Leprivier1, Marc Remke, Barak Rotblat
1Department of Molecular Oncology, British Columbia Cancer Research Centre, University of British Columbia (UBC), Vancouver, BC V5Z1L4, Canada.
Cell
|May 28, 2013
概括
幼核延长因子2激酶 (eEF2K) 途径对于营养缺乏期间的细胞存活至关重要. 这一途径有助于瘤细胞适应代谢压力,eEF2K促进对营养物质吸收的抵抗力.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 在瘤学瘤学.
背景情况:
- 细胞生存依赖于对营养缺乏的代谢适应.
- 由AMP激活的蛋白激酶 (AMPK) 途径调节细胞代谢.
- 瘤细胞表现出对营养缺乏的抵抗力.
研究的目的:
- 研究真核延长因子2激酶 (eEF2K) 在细胞适应营养缺乏的作用.
- 为了确定AMPK-eEF2K轴在代谢应激下瘤细胞存活中的参与.
- 探索针对癌症eEF2K的治疗潜力.
主要方法:
- 在营养缺乏下,研究了AMPK对eEF2K的激活.
- 在细胞系和小鼠瘤中利用eEF2K淘汰和淘汰模型.
- 分析了人类癌症患者数据中的基因表达和存活率 (骨髓母细胞瘤,多形质母细胞瘤).
- 检查了C. elegans菌株对营养物质枯竭的反应,这些菌株缺乏eEF2K正义表 (efk-1).
主要成果:
- 通过AMPK激活eEF2K阻断翻译延长,在急性营养物质耗尽期间赋予细胞存活.
- 瘤细胞重新激活AMPK-eEF2K轴以适应营养缺乏.
- 对eEF2K的损失严重影响了转化细胞对营养吸收的适应.
- 在小鼠瘤中,eEF2K过度表达赋予了对热量限制的抵抗力.
- eEF2K表达与人类脑髓母细胞瘤和多种质母细胞瘤的整体存活率相关.
- efk-1 缺乏的 C. elegans 显示营养物质枯竭反应受损.
结论:
- eEF2K在保护细胞免受营养缺乏方面起着保留作用.
- 该eEF2K通路对于瘤细胞适应代谢压力至关重要.
- 针对eEF2K可能是一个可行的策略,以克服瘤对营养剥夺和热量限制的抵抗力.
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