Psat1产生的α-甲酸盐和谷氨酸促进肌肉干细胞的激活和再生
Veronica Ciuffoli1, Xuesong Feng1, Kan Jiang2
1Laboratory of Muscle Stem Cells and Gene Regulation, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA.
Genes & development
|March 7, 2024
概括
代谢调节干细胞生物学. 血清蛋白生物合成途径酶Psat1对于肌肉干细胞的再生至关重要,因为它通过产生阿尔法-谷氨酸和谷氨酸,这些蛋白质随着年龄的增长而下降.
科学领域:
- 细胞代谢的细胞代谢.
- 干细胞生物学 干细胞生物学
- 肌肉再生 肌肉再生
背景情况:
- 代谢对于成年干细胞的功能至关重要,包括能源供应,生物质生成和为染色质修饰剂提供辅因子.
- 血清生物合成途径 (SBP) 是糖解的一个分支,在细胞代谢和生物合成中发挥作用.
研究的目的:
- 为了研究血清蛋白生物合成途径 (SBP) 在成年肌肉干细胞 (MuSC) 生物学中在再生过程中的作用.
- 为了确定特定的SBP酶和代谢物参与MuSC激活,扩张和肌肉修复.
- 探索衰老对SBP活动对MuSCs的影响以及潜在的治疗干预措施.
主要方法:
- 基因失活研究针对Psat1,这是SBP中的关键酶.
- 代谢组分析以量化MuSCs中的代谢物水平.
- 在体内评估MuSC激活,扩张和肌肉再生能力.
- 用α-谷氨酸 (α-KG) 或谷氨酸来评估它们对再生的影响.
主要成果:
- 血清蛋白生物合成途径 (SBP) 在再生肌肉干细胞 (MuSCs) 中被激活.
- Psat1对于MuSC激活和肌原原体扩张至关重要,通过α-甲酸盐 (α-KG) 和谷氨酸生产调解其作用.
- 缺少Psat1会影响MuSC扩张和肌肉再生.
- 在老年小鼠的MuSC中,Psat1,α-KG和谷氨酸的水平降低,与再生能力受损相关.
- 用α-KG或谷氨酸补充剂恢复了老年小鼠和条件删除Psat1的小鼠的肌肉再生.
结论:
- 通过α-KG和谷氨酸的产生,PSAT1在肌肉干细胞再生中发挥着至关重要的代谢作用.
- 降低Psat1,α-KG和谷氨酸有助于与年龄相关的肌肉再生的下降.
- α-KG和谷氨胺是增强衰老期间肌肉再生的潜在治疗点.
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