降解性碳化支持在固独立生长期间的氧化还原稳定
Lei Jiang1, Alexander A Shestov2, Pamela Swain3
1Children's Medical Center Research Institute, UT Southwestern Medical Center, Dallas, Texas 75390-8502, USA.
Nature
|April 7, 2016
概括
癌细胞通过改变新陈代谢而适应在没有细胞粘附的情况下生长. 这项研究揭示了一种新的途径,其中细胞系异酸脱酶-1 (IDH1) 有助于控制反应性氧物种 (ROS) 并支持固独立癌细胞的瘤生长.
科学领域:
- 细胞生物学
- 代谢调节
- 癌症研究
背景情况:
- 细胞附着在细胞外基质 (ECM) 提供生存信号.
- 恶性细胞通常表现出独立于固的生长,脱离ECM.
- 由于葡萄糖代谢的改变,脱离会增加活性氧物种 (ROS).
研究的目的:
- 在适应定独立时确定氧化还原平衡的新途径.
- 研究固独立细胞中的代谢变化,特别是葡萄糖和谷氨酸代谢.
- 在这些条件下阐明异酸脱酶 (IDH) 在支持瘤生长中的作用.
主要方法:
- 使用固独立的瘤球形模型.
- 分析了葡萄糖和谷氨酸的代谢.
- 使用同位素追踪和基因操纵 (IDH1/IDH2淘汰,IDH1抑制).
- 评估反应性氧物种 (ROS) 水平和线粒体功能.
主要成果:
- 独立于固的球体显示营养氧化被抑制,但依赖于细胞同位素脱酶-1 (IDH1) 的降解性酸盐形成增强.
- 在球体中,IDH1减轻了线粒体ROS,独立于缺氧.
- 减少产生的酸盐进入线粒体,通过IDH2产生NADPH,抑制线粒体ROS并促进生长.
- 失去了IDH1,IDH2或线粒体酸转运体,导致球状体生长受损,线粒体ROS增加.
结论:
- 适应固独立性包括由IDH1启动的降解性碳化转移.
- 这一途径对于抑制线粒体ROS和促进脱离的癌细胞生长至关重要.
- 针对这种酸盐代谢途径可以为需要结独立的癌症提供新的治疗策略.
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