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细胞内代谢梯度决定了对外源性pyruvate的依赖
Benjamin T Jackson1,2, Angela M Montero1,3, Sangita Chakraborty1
1Cell Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY, USA.
Nature metabolism
|April 28, 2025
概括
纯粹的胚胎干细胞由于高的线粒体消耗,独特地依赖于外部的酸盐. 恢复细胞NAD+水平减轻了这种依赖于酸盐的情况,揭示了关键的代谢脆弱性.
科学领域:
- 细胞生物学 细胞生物学
- 代谢工程是代谢工程.
- 发展生物学 发展生物学
背景情况:
- 细胞代谢网络在发育过渡期间被重塑.
- 胚胎干细胞 (ES) 在多能性期间经历显著的代谢变化.
- 了解营养依赖对于研究细胞状态过渡至关重要.
研究的目的:
- 研究细胞内代谢网络的变化如何影响细胞状态转换中的外源营养依赖.
- 阐明纯粹的ES细胞对特定营养的依赖性.
- 为了确定多能干细胞的代谢漏洞.
主要方法:
- 使用胚胎干细胞 (ES) 作为模型系统.
- 分析了营养素的摄取和依赖,特别是聚焦于pyruvate.
- 研究了线粒体中pyruvate消耗和细胞质NAD+再生的作用.
- 研究了恢复细胞质NAD+再生对酸盐耐受性的影响.
主要成果:
- 纯粹的ES细胞通过单碳酸盐载体MCT1.1通过外源性pyruvate的吸收和依赖性增加.
- 这种依赖于酸盐的情况即使在葡萄糖或乳酸盐丰富的情况下也会持续下去.
- 在天真的ES细胞中,线粒体酸盐的消耗增加,推动了对细胞外酸盐的需求.
- 恢复细胞质NAD+再生减轻了天真ES细胞中pyruvate的依赖性.
结论:
- 细胞内代谢梯度显著影响了外源性pyruvate的吸收和依赖.
- 线粒体的酸盐代谢在天真的ES细胞中代表了关键的代谢脆弱性.
- 代谢灵活性和营养依赖是多能细胞状态的关键特征.
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