益生菌Bacillus pumilus LV149增强了肠道修复,调节了微生物群,并在DSS诱导的大肠炎小鼠中改变了转录组
Xinyu Sun1, Long Yun2, Keming Xie3
1School of Life Sciences and Biopharmaceutics, Guangdong Pharmaceutical University, Guangzhou, China.
Frontiers in microbiology
|January 23, 2025
概括
杆菌LV149,一种益生菌,在性结肠炎 (UC) 鼠标模型中有效修复了肠道损伤. 较高剂量 (LV149-H) 显示出更强的抗炎和肠道保护作用,表明其对UC的治疗潜力.
科学领域:
- 微生物学和免疫学
- 胃肠病学 胃肠病学
- 益生菌研究 益生菌研究
背景情况:
- 肠道微生物群失调是性结肠炎 (UC) 进展的关键因素.
- 益生菌正在被研究作为一种潜在的治疗策略来管理UC.
- 了解UC中益生菌作用的具体机制对于有效治疗至关重要.
研究的目的:
- 为了评估不同剂量的Bacillus pumilus LV149在修复肠道损伤中的有效性,在硫酸 (DSS) 诱导的性结肠炎 (UC) 鼠标模型中.
- 调查潜在的机制,包括对肠道屏障完整性,炎症和肠道微生物群组成的影响.
- 为了确定效果是否依赖于剂量.
主要方法:
- 在雄性C57BL/6小鼠中使用3%的DSS溶液诱导了性结肠炎.
- 小鼠每天接受口服测量剂量低 (1 × 10^8 CFU/天) 或高 (1 × 10^9 CFU/天) 的Bacillus pumilus LV149.
- 评估包括生理参数,疾病活性指数 (DAI),结肠长度,肠道屏障完整性标志物 (粘膜,紧结),炎症性细胞因子水平 (TNF-α,IL-1β,IL-6,IL-10),血清脂多糖 (LPS),肠道微生物组合,以及转录组分析.
主要成果:
- 菌LV149显著改善了UC症状,包括体重减轻和DAI,并以剂量依赖的方式减少了结肠缩短.
- LV149恢复了肠道屏障功能,通过调节粘膜和紧结蛋白,并减少血清LPS.
- 高剂量 (LV149-H) 显著降低了促炎性细胞因子 (TNF-α,IL-1β,IL-6) 和增加了抗炎性IL-10,而这两种剂量都增加了IL-10表达. 转录组分析表明,低剂量 (IL-17) 和高剂量 (JAK-STAT) 影响的途径不同.
结论:
- 菌LV149,特别是在较高的剂量,有效地减轻DSS诱导的大肠损伤在小鼠.
- 益生菌增强了肠道屏障的完整性,减少了炎症,并调节了肠道微生物群的组成.
- 剂量取决于LV149-H的抗炎和肠道保护作用,突显了LV149-H作为性结肠炎治疗剂的潜力.
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