LXJ
(2023-03-31 19:51):
#paper Gut-innervating nociceptors regulate the intestinal microbiota to promote tissue protection. Cell. 2022 Oct 27;185(22):4170-4189.e20. doi: 10.1016/j.cell.2022.09.008. 伤害性疼痛是许多慢性炎症性疾病的标志,包括炎症性肠病(IBD);然而,痛觉神经元是否会影响肠道炎症仍不清楚。利用化学遗传学沉默、腺病毒介导的结肠特异性沉默和TRPV1+伤害感受器的药理学消融,我们在肠道损伤和炎症的小鼠模型中观察到更严重的炎症和有缺陷的组织保护性修复过程。破坏的伤害感受导致肠道微生物群的显著改变和可传播的微生态失调,而革兰氏+梭菌对无菌小鼠的单定殖。通过伤害感受器依赖性途径促进肠道组织保护。从机制上讲,伤害感受的破坏导致P物质水平下降,而P物质的治疗性递送以微生物群依赖的方式促进了TRPV1+伤害感受器发挥的组织保护作用。最后,在IBD患者的肠道活检中观察到伤害感受器基因表达失调。总之,这些发现表明,伤害感受、肠道微生物群和肠道稳态恢复之间存在进化上保守的功能联系。
Gut-innervating nociceptors regulate the intestinal microbiota to promote tissue protection
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Abstract:
Nociceptive pain is a hallmark of many chronic inflammatory conditions including inflammatory bowel diseases (IBDs); however, whether pain-sensing neurons influence intestinal inflammation remains poorly defined. Employing chemogenetic silencing, adenoviral-mediated colon-specific silencing, and pharmacological ablation of TRPV1 nociceptors, we observed more severe inflammation and defective tissue-protective reparative processes in a murine model of intestinal damage and inflammation. Disrupted nociception led to significant alterations in the intestinal microbiota and a transmissible dysbiosis, while mono-colonization of germ-free mice with GramClostridium spp. promoted intestinal tissue protection through a nociceptor-dependent pathway. Mechanistically, disruption of nociception resulted in decreased levels of substance P, and therapeutic delivery of substance P promoted tissue-protective effects exerted by TRPV1 nociceptors in a microbiota-dependent manner. Finally, dysregulated nociceptor gene expression was observed in intestinal biopsies from IBD patients. Collectively, these findings indicate an evolutionarily conserved functional link between nociception, the intestinal microbiota, and the restoration of intestinal homeostasis.
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