Survival analysis and microarray profiling identify Cd40 as a candidate for the Salmonella susceptibility locus, Ity5

Genes Immun. Jan-Feb 2016;17(1):19-29. doi: 10.1038/gene.2015.41. Epub 2015 Nov 12.

Abstract

The outcome of infection with Salmonella Typhimurium in mouse models of human typhoid fever is dependent upon a coordinated complex immune response. A panel of recombinant congenic strains (RCS) derived from reciprocal backcross of A/J and C57BL/6J mice was screened for their susceptibility to Salmonella infection and two susceptibility loci, Ity4 (Immunity to Typhimurium locus 4) and Ity5, were identified. We validated Ity5 in a genetic environment free of the impact of Ity4 using a cross between A/J and 129S6. Using a time-series analysis of genome-wide transcription during infection, comparing A/J with AcB60 mice having a C57BL/6J-derived Ity5 interval, we have identified the differential expression of the positional candidate gene Cd40, Cd40-associated signaling pathways, and the differential expression of numerous genes expressed in neutrophils. CD40 is known to coordinate T cell-dependent B-cell responses and myeloid cell activation. In fact, CD40 signaling is altered in A/J mice as seen by impaired IgM upregulation during infection, decreased Ig class switching, neutropenia, reduced granulocyte recruitment in response to infection and inflammation, and decreased ERK1/2 activity. These results suggest that altered CD40 signaling and granulocyte recruitment in response to infection are responsible for the Ity5-associated Salmonella susceptibility of A/J mice.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • CD40 Antigens / immunology*
  • Cation Transport Proteins / genetics*
  • Cation Transport Proteins / immunology
  • Crosses, Genetic
  • Disease Models, Animal*
  • Gene Expression Profiling
  • Genetic Predisposition to Disease
  • Immunoglobulins / immunology
  • MAP Kinase Signaling System
  • Mice* / classification
  • Mice* / genetics
  • Mice* / immunology
  • Mice, Inbred C57BL
  • Neutrophil Activation
  • Salmonella Infections, Animal / immunology*

Substances

  • CD40 Antigens
  • Cation Transport Proteins
  • Immunoglobulins
  • natural resistance-associated macrophage protein 1