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

Overview

MeSH Major

  • Asymptomatic Diseases
  • Cerebrovascular Disorders
  • Coronary Artery Disease
  • Peripheral Arterial Disease

abstract

  • © 2015 Elsevier Inc. 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.

publication date

  • May 13, 2015

Research

keywords

  • Academic Article

Identity

Digital Object Identifier (DOI)

  • 10.1016/j.chom.2015.04.001

PubMed ID

  • 25936799

Additional Document Info

start page

  • 617

end page

  • 627

volume

  • 17

number

  • 5