在MCF-7细胞中的葡萄糖-胺代谢相互作用,一种激素敏感乳腺癌模型
Sonia Carta1, Maddalena Ghelardoni1, Francesca Vitale1
1Nuclear Medicine Unit, Istituti di Ricovero e Cura a Carattere Scientifico (IRCCS) Ospedale Policlinico San Martino, 16132 Genoa, Italy.
Frontiers in bioscience (Landmark edition)
|July 31, 2024
概括
乳腺癌细胞中的谷氨胺和葡萄糖缺乏并没有增加活性氧物种 (ROS). 相反,它降低了内细胞网膜酸通路 (ER-PPP) 的活性,这表明它在氧化还原平衡调节中的作用.
科学领域:
- 细胞代谢的细胞代谢.
- 癌症生物学 癌症生物学
- 氧化还原平衡 (redox homeostasis) 是一种
背景情况:
- 选择性谷氨胺剥夺增加了活性氧物种 (ROS) 并损害了内分泌网膜酸路径 (ER-PPP) 的活性.
- 这表明通过ER-PPP的葡萄糖流有助于乳腺癌细胞的氧化还原应激.
- 这项研究研究的是,如果结合葡萄糖和谷氨胺剥夺改变了这种反应.
研究的目的:
- 评估结合葡萄糖和谷氨酸缺乏对乳腺癌细胞代谢和氧化还原状态的影响.
- 为了确定这种联合营养缺乏是否会增加ROS生成.
- 阐明ER-PPP在调解这些影响中的作用.
主要方法:
- MCF-7细胞经过48小时的营养饥饿 (低葡萄糖,零谷氨酸) 进行.
- 海马技术评估了氧气消耗率 (OCR) 和质子流量率 (PER).
- 测量了18F-氧化葡萄糖 (FDG) 的吸收,扩散 (CFSE) 和活力 (酸).
主要成果:
- 结合营养饥饿减少了繁殖,但不能降低生命力,减少了乳酸释放和PER.
- 整体OCR没有变化,但依赖ATP合成酶的OCR增加.
- 氧化压力标志物减少,ER-PPP活性 (通过FDG吸收和H6PD表达表示) 显著受损.
结论:
- 结合的葡萄糖和谷氨酸剥夺不会增加MCF-7细胞中的ROS.
- 减少的ER-PPP活性表明谷氨酸会影响网状葡萄糖代谢,以调节氧化还原平衡.
- 这突显了癌细胞适应营养压力的新机制.
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