13C稳定同位素的追踪揭示了在增殖细胞和氧化细胞中不同的脂肪酸氧化途径
Julia Ritterhoff1,2,3, Timothy McMillen1, Hanna Foundas2
1Department of Anesthesiology and Pain Medicine, Mitochondria and Metabolism Center, University of Washington, Seattle, Washington, United States.
American journal of physiology. Cell physiology
|November 29, 2024
概括
脂肪酸氧化在增殖和氧化细胞中强大,但它们的代谢途径在酸盐后分离. 葡萄糖氧化将脂肪酸碳转移到替代途径,影响细胞能量平衡.
科学领域:
- 细胞代谢的细胞代谢.
- 生物化学 生物化学
- 代谢学 代谢学 代谢学
背景情况:
- 三碳酸 (TCA) 循环平衡了细胞的代谢和合成反应需求.
- 与葡萄糖衍生的碳相比,脂肪酸 (FA) 衍生的碳在TCA循环中的命运是不太了解的.
研究的目的:
- 通过不同细胞类型的TCA循环研究脂肪酸碳的代谢命运.
- 阐明脂肪酸氧化 (FAO) 如何与增殖与氧化细胞中的TCA循环进行交互.
主要方法:
- 开发了长链脂肪酸 (FA) 的细胞培养策略,而不会影响生命力.
- 利用C稳定同位素溶解的代谢学来追踪FA衍生的碳.
- 分析了FA驱动的氧气消耗率.
主要成果:
- 脂肪酸氧化 (FAO) 在增殖和氧化细胞中都是强大的.
- 在增殖细胞中,由FA衍生的碳物以酸盐的形式退出TCA循环,并在细胞质中转化为酸盐.
- 葡萄糖氧化与粮农组织在规范的TCA途径上竞争,促进FA碳进入替代途径.
- 粮农组织与TCA循环之间的合因细胞的氧化能量代谢状态而异.
结论:
- 脂肪酸碳代谢下游的酸盐在增殖和氧化细胞之间存在显著差异.
- 脂肪酸对TCA循环的差异性参与对于平衡细胞代谢和合成反应需求至关重要.
- 这项研究为通过β-氧化和TCA循环的脂肪酸碳流提供了新的见解.
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