Jill Roberts Institute for Research in Inflammatory Bowel Disease, Joan and Sanford I. Weill Department of Medicine, Department of Microbiology and Immunology, Weill Cornell Medicine, Cornell University, New York, NY 10021, USA.
Department of Anesthesiology, The Center for the Study of Itch, Washington University School of Medicine, St. Louis, MO, USA.
Cell. 2022 Oct 27;185(22):4170-4189.e20. doi: 10.1016/j.cell.2022.09.008. Epub 2022 Oct 14.
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.
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,疼痛感知神经元是否会影响肠道炎症仍未得到明确界定。我们采用化学遗传沉默、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,观察到在肠道损伤和炎症的小鼠模型中,炎症更严重,组织保护性修复过程受损。伤害性感觉的中断导致肠道微生物群发生显著改变和可传播的生态失调,而无菌小鼠的单定植革兰氏梭菌属促进了肠道组织保护,这是一种通过伤害感受器依赖的途径。从机制上讲,伤害性感觉的中断导致 P 物质水平降低,而 P 物质的治疗性输送以依赖于微生物群的方式促进 TRPV1 伤害感受器发挥组织保护作用。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内稳态的恢复之间存在进化上保守的功能联系。
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