Salmonella-induced diarrhea occurs in the absence of IL-8 receptor (CXCR2)-dependent neutrophilic inflammation

Ronald R. Marchelletta, Melanie Gareau, Sharon Okamoto, Donald G. Guiney, Kim E. Barrett, Joshua Fierer

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

Gastroenteritis is the most common manifestation of nontyphoidal Salmonella enterica infections, but little is known about the pathogenesis of diarrhea in this infection Methods. To determine whether polymorphonuclear neutrophils (PMNs) are required for diarrhea for Salmonella colitis, we infected kanamycin-pretreated interleukin 8R (IL-8R) mutant mice and controls, both with nonmutant Slc11a1 (Nramp1, ItyR).We compared the 2 mouse strains for increases in fecal water content (diarrhea) 3 days after infection, changes in expression of ion transporters in colonic epithelial cells, proliferation of epithelial cells, and severity of infection as measured by colony-forming units (CFUs). Results. The IL-8R knockout mice had fewer PMNs in the colon but the other variables we measured were unaffected except for an increase in CFUs in the colon. The pathologic changes in the cecum were similar in both groups except for the lack of PMNs in the IL-8R knockout mice. There was minimal damage to the colon more distally. Conclusions. In the early stage of Salmonella colitis, PMNs are not required for diarrhea or for the decrease in expression of colonic epithelial cell apical ion transporters. They contribute to defense against infection in the cecum but not extracolonically at this stage of Salmonella colitis.

Original languageEnglish (US)
Pages (from-to)128-136
Number of pages9
JournalJournal of Infectious Diseases
Volume212
Issue number1
DOIs
StatePublished - Jul 1 2015
Externally publishedYes

Keywords

  • colitis
  • Diarrhea
  • epithelial cell
  • ion transporter.
  • neutrophil
  • Salmonella

ASJC Scopus subject areas

  • Infectious Diseases
  • Immunology and Allergy

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