急性摄入β-基β-甲基酸盐 (HMB) 对人类骨肌肉转录组的影响
Daniel J Wilkinson1, Iain J Gallagher2, Hannah Crossland1
1Centre of Metabolism, Ageing & Physiology, National Institute of Health Research (NIHR) Biomedical Research Centre (BRC), University of Nottingham, Nottingham NG7 2RD, UK.
Nutrients
|February 13, 2026
概括
补充β-基β-甲基酸盐 (HMB) 改变了肌肉基因表达,影响了对蛋白质循环和氨基酸运输至关重要的途径. 这项研究揭示了HMB.
科学领域:
- 肌肉生理学 肌肉生理学
- 分子生物学分子生物学
- 营养科学 营养科学
背景情况:
- 骨肌肉损失在衰老和疾病中越来越令人担忧.
- β-基β-甲基丁酸盐 (HMB),一种氨酸代谢物,以其对肌肉的合成代谢作用而闻名.
- HMB的精确分子机制,特别是它对肌肉转录组的影响,仍未得到充分探索.
研究的目的:
- 研究HMB补充剂对年轻男性肌肉转录组的急性影响.
- 为了确定受HMB消费影响的特定基因和分子通路.
- 阐明HMB在肌肉蛋白质平衡中的机械作用.
主要方法:
- 在HMB摄入之前和之后,从年轻男性获得肌肉活检.
- 使用RNA测序提取和分析总RNA,以评估全球基因表达变化.
- 进行了差异基因表达分析和通路丰富分析以确定功能影响.
主要成果:
- HMB显著改变了800多个基因的表达,包括那些参与JAK-STAT信号,昼夜节律和TNFα信号的基因.
- 与蛋白质合成和肌肉蛋白循环相关的关键基因被HMB调节.
- 在HMB上调节了氨基酸载体SLC36A1 (PAT1) 和SLC7A5 (LAT1) 的表达.
结论:
- HMB诱导了骨肌肉的显著转录变化,支持其在肌肉蛋白质平衡 (蛋白质平衡) 中的作用.
- 观察到的氨基酸载体的上调表明,HMB可能有助于营养吸收,类似于蛋白质摄入.
- 需要进一步的研究来探索HMB在老龄化人口中的转录和蛋白质效应,以及它与运动的协同作用.
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