Human gut bacterial metabolism drives Th17 activation and colitis.

Human gut bacterial metabolism drives Th17 activation and colitis.
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DOI:
10.1016/j.chom.2021.11.001
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发表时间:
2022-01-12
影响因子:
30.3
通讯作者:
Turnbaugh PJ
Turnbaugh PJ
中科院分区:
医学1区
文献类型:
--
作者:
Alexander M;Ang QY;Nayak RR;Bustion AE;Sandy M;Zhang B;Upadhyay V;Pollard KS;Lynch SV;Turnbaugh PJ

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辅助 T 17 (Th17) 细胞的细菌激活会加剧小鼠自身免疫模型,但人类相关细菌如何影响 Th17 驱动的疾病仍然难以捉摸。我们发现,人肠道 Actinobacter Eggerthella lenta 通过细胞和抗原独立机制解除对 Th17 转录因子 Rorγt 的抑制,从而诱导肠道 Th17 激活。 E. lenta 在炎症性肠病 (IBD) 患者中含量丰富,并以 Rorc 依赖性方式使小鼠结肠炎恶化。 Th17 的激活因迟缓 E. lenta 菌株而异,这归因于强心苷还原酶 2 (Cgr2)。 Cgr2 足以诱导白细胞介素 (IL)-17a(一种主要的 Th17 细胞因子)。 cgr2+ E. lenta 在纯培养物中消耗假定的甾体糖苷;相关化合物与人类 IBD 严重程度呈负相关。最后,利用 Cgr2 对膳食精氨酸的敏感性,我们预防了慢肠杆菌引起的小鼠肠道炎症。总之,这些结果支持人类肠道细菌代谢在驱动 Th17 依赖性自身免疫中的作用。亚历山大等人。研究表明,一种与自身免疫相关的微生物,Eggerthella lenta,会激活 Th17 细胞,并使小鼠结肠炎模型恶化。利用菌株水平变异、比较基因组学和细菌遗传学,他们证明强心苷还原酶 2 (Cgr2) 酶足以激活 Th17,并且升高的饮食精氨酸可以阻止迟缓大肠杆菌诱导的结肠炎。
Bacterial activation of T helper 17 (Th17) cells exacerbates mouse models of autoimmunity, but how human-associated bacteria impact Th17-driven disease remains elusive. We show that human gut Actinobacterium Eggerthella lenta induces intestinal Th17 activation by lifting inhibition of the Th17 transcription factor Rorγt through cell- and antigen-independent mechanisms. E. lenta is enriched in inflammatory bowel disease (IBD) patients and worsens colitis in a Rorc-dependent manner in mice. Th17 activation varies across E. lenta strains, which is attributable to the Cardiac glycoside reductase 2 (Cgr2) enzyme. Cgr2 is sufficient to induce interleukin(IL)-17a, a major Th17 cytokine. cgr2+ E. lenta deplete putative steroidal glycosides in pure culture; related compounds are negatively associated with human IBD severity. Finally, leveraging the sensitivity of Cgr2 to dietary arginine, we prevented E. lenta-induced intestinal inflammation in mice. Together, these results support a role for human gut bacterial metabolism in driving Th17-dependent autoimmunity. Alexander et al. show an autoimmune-associated microbe, Eggerthella lenta, activates Th17 cells and worsens mouse models of colitis. Using strain-level variation, comparative genomics, and bacterial genetics they demonstrate that the Cardiac glycoside reductase 2 (Cgr2) enzyme is sufficient for Th17 activation and that elevated dietary arginine blocks E. lenta-induced colitis.
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