Advanced Science (Oct 2022)

Tonsillar Microbiome‐Derived Lantibiotics Induce Structural Changes of IL‐6 and IL‐21 Receptors and Modulate Host Immunity

  • Jing Li,
  • Jiayang Jin,
  • Shenghui Li,
  • Yan Zhong,
  • Yuebo Jin,
  • Xuan Zhang,
  • Binbin Xia,
  • Yinhua Zhu,
  • Ruochun Guo,
  • Xiaolin Sun,
  • Jianping Guo,
  • Fanlei Hu,
  • Wenjing Xiao,
  • Fei Huang,
  • Hua Ye,
  • Ru Li,
  • Yunshan Zhou,
  • Xiaohong Xiang,
  • Haihong Yao,
  • Qiulong Yan,
  • Li Su,
  • Lijun Wu,
  • Tuoping Luo,
  • Yudong Liu,
  • Xiaohuan Guo,
  • Junjie Qin,
  • Hai Qi,
  • Jing He,
  • Jun Wang,
  • Zhanguo Li

DOI
https://doi.org/10.1002/advs.202202706
Journal volume & issue
Vol. 9, no. 30
pp. n/a – n/a

Abstract

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Abstract Emerging evidence emphasizes the functional impacts of host microbiome on the etiopathogenesis of autoimmune diseases, including rheumatoid arthritis (RA). However, there are limited mechanistic insights into the contribution of microbial biomolecules especially microbial peptides toward modulating immune homeostasis. Here, by mining the metagenomics data of tonsillar microbiome, a deficiency of the encoding genes of lantibiotic peptides salivaricins in RA patients is identified, which shows strong correlation with circulating immune cells. Evidence is provided that the salivaricins exert immunomodulatory effects in inhibiting T follicular helper (Tfh) cell differentiation and interleukin‐21 (IL‐21) production. Mechanically, salivaricins directly bind to and induce conformational changes of IL‐6 and IL‐21 receptors, thereby inhibiting the bindings of IL‐6 and IL‐21 to their receptors and suppressing the downstream signaling pathway. Finally, salivaricin administration exerts both prophylactic and therapeutic effects against experimental arthritis in a murine model of RA. Together, these results provide a mechanism link of microbial peptides‐mediated immunomodulation.

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