Department of Gastroenterology, Sir Run Run Shaw Hospital, Zhejiang University, Hangzhou, Zhejiang, 310058, China.
Department of Gastroenterology, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, Zhejiang, 310058, China.
Adv Sci (Weinh). 2023 Dec;10(36):e2303457. doi: 10.1002/advs.202303457. Epub 2023 Nov 20.
Gut microbiome is integral to the pathogenesis of ulcerative colitis. A novel probiotic Lactobacillus intestinalis (L. intestinalis) exerts a protective effect against dextran sodium sulfate-induced colitis in mice. Based on flow cytometry, colitis-associated Th17 cells are the target of L. intestinalis, which is supported by the lack of protective effects of L. intestinalis in T cell-null Rag1 mice or upon anti-IL-17-A antibody-treated mice. Although L. intestinalis exerts no direct effect on T cell differentiation, it decreases C/EBPA-driven gut epithelial SAA1 and SAA2 production, which in turn impairs Th17 cell differentiation. Cometabolism of L. intestinalis ALDH and host ALDH1A2 contributed to elevated biosynthesis of retinoic acid (RA), which accounts for the anti-colitis effect in RAR-α -mediated way. In a cohort of ulcerative colitis patients, it is observed that fecal abundance of L. intestinalis is negatively associated with the C/EBPA-SAA1/2-Th17 axis. Finally, L. intestinalis has a synergistic effect with mesalazine in alleviating murine colitis. In conclusion, L. intestinalis and associated metabolites, RA, have potential therapeutic effects for suppressing colonic inflammation by modulating the crosstalk between intestinal epithelia and immunity.
肠道微生物群是溃疡性结肠炎发病机制的重要组成部分。一种新型益生菌——肠道乳杆菌(L. intestinalis)对葡聚糖硫酸钠诱导的小鼠结肠炎具有保护作用。基于流式细胞术,结肠炎相关的 Th17 细胞是 L. intestinalis 的作用靶点,这一作用在 T 细胞缺失 Rag1 小鼠或经抗 IL-17-A 抗体处理的小鼠中缺乏保护作用得到支持。尽管 L. intestinalis 对 T 细胞分化没有直接影响,但它可降低 C/EBPA 驱动的肠道上皮 SAA1 和 SAA2 的产生,进而损害 Th17 细胞分化。肠道乳杆菌 ALDH 和宿主 ALDH1A2 的共代谢作用导致视黄酸(RA)的生物合成增加,这解释了 RAR-α 介导的抗结肠炎作用。在溃疡性结肠炎患者队列中,观察到肠道乳杆菌的粪便丰度与 C/EBPA-SAA1/2-Th17 轴呈负相关。最后,肠道乳杆菌与美沙拉嗪在缓解小鼠结肠炎方面具有协同作用。总之,肠道乳杆菌及其相关代谢物 RA 通过调节肠道上皮与免疫之间的相互作用,具有抑制结肠炎症的潜在治疗作用。
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