丁酸盐在患有线粒体缺陷的小鼠中延长健康和寿命
Enrique Gabandé-Rodríguez1, Manuel M Gómez de Las Heras1,2, Pablo Ramírez-Ruiz de Erenchun1,2
1Tissue and Organ Homeostasis Program, Centro de Biología Molecular Severo Ochoa (CBM), Consejo Superior de Investigaciones Científicas (CSIC) - Universidad Autónoma de Madrid (UAM), Madrid, Spain.
Nature communications
|March 14, 2026
概括
线粒体转录因子A (TFAM) 缺乏导致多系统功能障碍. 恢复肠道微生物群衍生的酸盐可以缓解症状,并延长小鼠的寿命,突显了宿主微生物群共生的重要性.
科学领域:
- 线粒体生物学 线粒体生物学
- 微生物组研究 微生物组研究
- 遗传学 遗传学 是一个
背景情况:
- 线粒体疾病会导致随着有限的治疗而导致渐进的多系统衰竭.
- 线粒体转录因子A (TFAM) 对于线粒体DNA (mtDNA) 的维护至关重要.
- TFAM 缺乏导致严重的线粒体功能障碍和器官衰竭.
研究的目的:
- 研究缓解线粒体功能障碍的策略.
- 创建和分析具有诱导TFAM缺陷的小鼠模型.
- 探索肠道微生物群和短链脂肪酸 (SCFA) 在线粒体疾病中的作用.
主要方法:
- 创建了一个可诱导他莫西芬的TFAM淘汰赛小鼠模型 (iTfamKO).
- 评估了iTfamKO小鼠的多器官功能障碍,肠道屏障完整性和肠道微生物群组成.
- 向iTfamKO小鼠进行了微生物群转移或基素 (酸盐前体) 的管理.
- 在肠道中分析了表观遗传性素化.
主要成果:
- 在iTfamKO小鼠中,系统性TFAM缺乏导致了广泛的线粒体衰退和多器官功能障碍,包括脂质缩,肉,代谢变化,功能衰竭,神经退行和过早死亡.
- iTfamKO小鼠表现出肠道屏障功能受损和肠道功能失调,酸盐水平降低.
- 在mtDNA突变小鼠中观察到类似的肠道表型,这表明缺乏丁酸盐生成的共同机制.
- 在iTfamKO小鼠中,微生物群转移或分红素的使用延缓了疾病的进展,并延长了寿命.
- 丁酸盐补充剂恢复了肠道中失去了表观遗传的基酸化标记.
结论:
- TFAM 缺乏导致严重的线粒体功能障碍和多器官衰竭.
- 肠道功能障碍和减少的丁酸盐是TFAM缺乏引起的线粒体功能障碍的关键特征.
- 通过微生物群调节或前体的管理来恢复丁酸盐水平,可以改善疾病表型并延长寿命.
- 维持宿主-微生物群共生对于管理线粒体疾病至关重要.
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