分支链氨基酸通过降低结肠酸水平来加剧结肠炎的进展
Ana Mendes-Frias1,2, Maria C Vieira1,2, Marta Araújo1,2
1Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Braga, Portugal.
Inflammatory bowel diseases
|September 10, 2025
概括
分链氨基酸 (BCAA) 补充剂通过改变肠道微生物群和代谢物,使小鼠的结肠炎恶化. 丁甲基烟酸 (DMF) 在减轻这些不良影响方面表现有希望,强调在炎症条件下使用BCAA应谨慎使用.
科学领域:
- 胃肠道学和免疫学
- 微生物组研究 微生物组研究
- 代谢学 代谢学 代谢学
背景情况:
- 性结肠炎 (UC) 的病因尚不清楚,但代谢物对肠道健康至关重要.
- 之前的研究表明,在抗大肠炎的小鼠中,丰富的结肠分支链氨基酸 (BCAA) 已被发现.
- 这表明BCAA在UC发展中的潜在作用.
研究的目的:
- 调查BCAA补充剂对小鼠中硫酸 (DSS) 诱导的大肠炎的影响.
- 探索涉及肠道微生物群和代谢变化的潜在机制.
- 评估二甲基烟酸 (DMF) 在缓解BCAA诱导的大肠炎恶化方面的治疗潜力.
主要方法:
- 小鼠接受了BCAA补充剂,随后发生了DSS诱导的大肠炎.
- 评估疾病活动指数 (DAI),免疫细胞分析,组织学和转录学.
- 进行了16S rRNA测序,代谢分析和DMF治疗干预.
主要成果:
- 补充BCAA加剧了结肠炎,增加了DAI和组织学损伤.
- 观察到免疫细胞种群的变化 (ILC3降低,Th17/Treg增加) 和肠道微生物群的变化 (乳酸菌减少,病原生物增加).
- 代谢分析显示,结肠中烟酸减少,炎症代谢物增加;DMF治疗减轻了这些影响.
结论:
- 补充BCAA通过有害的肠道微生物群和代谢组变化加剧了DSS诱导的大肠炎.
- 治疗DMF有效地减轻了BCAA诱导的炎症,改善了疾病的结果.
- 研究结果强调在炎症期间应谨慎使用BCAA,并强调针对UC的微生物组向疗法.
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