Humoral immunity in the gut selectively targets phenotypically virulent attaching-and-effacing bacteria for intraluminal elimination

Nobuhiko Kamada, Kei Sakamoto, Sang Uk Seo, Melody Y. Zeng, Yun Gi Kim, Marilia Cascalho, Bruce A. Vallance, José L. Puente, Gabriel Núñez

研究成果: Article査読

82 被引用数 (Scopus)

抄録

Virulence factors expressed by enteric bacteria are pivotal for pathogen colonization and induction of intestinal disease, but the mechanisms by which host immunity regulates pathogen virulence are largely unknown. Here we show that specific antibody responses are required for downregulation of virulence gene expression in Citrobacter rodentium, an enteric pathogen that models human infections with attaching-and-effacing bacteria. In the absence of antibodies against the pathogen, phenotypically virulent C. rodentium, accumulated and infected the epithelium and subsequently invaded the lamina propia, causing host lethality. IgG induced after infection recognized virulence factors and bound virulent bacteria within the intestinal lumen, leading to their engulfment by neutrophils, while phenotypically avirulent pathogens remained in the intestinal lumen and were eventually outcompeted by the microbiota. Thus, the interplay of the innate and adaptive immune system selectively targets virulent C. rodentium in the intestinal lumen to promote pathogen eradication and host survival.

本文言語English
ページ(範囲)617-627
ページ数11
ジャーナルCell Host and Microbe
17
5
DOI
出版ステータスPublished - 2015 5月 13
外部発表はい

ASJC Scopus subject areas

  • 寄生虫科
  • 微生物学
  • ウイルス学

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