title: Immunological mechanisms underlying the genetic predisposition to severe Staphylococcus aureus infection in the mouse model.
abstract: Host genetic variations play a significant role in conferring predisposition to infection. In this study, we examined the immune mechanisms underlying the host genetic predisposition to severe Staphylococcus aureus infection in different mouse strains. Whereas C57BL/6 mice were the most resistant in terms of control of bacterial growth and survival, A/J, DBA/2, and BALB/c mice were highly susceptible and succumbed to infection shortly after bacterial inoculation. Other strains (C3H/HeN, CBA, and C57BL/10) exhibited intermediate susceptibility levels. Susceptibility of mice to S. aureus was associated with an inability to limit bacterial growth in the kidneys and development of pathology. Resistance to S. aureus in C57BL/6 mice was dependent on innate immune mechanisms because Rag2-IL2Rgamma(-/-) C57BL/6 mice, which are deficient in B, T, and NK cells, were also resistant to infection. Indeed, neutrophil depletion or inhibition of neutrophil recruitment rendered C57BL/6 mice completely susceptible to S. aureus, indicating that neutrophils are essential for the observed resistance. Although neutrophil function is not inhibited in A/J mice, expression of neutrophil chemoattractants KC and MIP-2 peaked earlier in the kidneys of C57BL/6 mice than in A/J mice, indicating that a delay in neutrophil recruitment to the site of infection may underlie the increased susceptibility of A/J mice to S. aureus.
authors.affiliation: Research Group Infection Immunology, Helmholtz Centre for Infection Research, Braunschweig, Germany.
authors.forename: Maren
authors.initials: M
authors.lastname: von Köckritz-Blickwede
authors.forename: Manfred
authors.initials: M
authors.lastname: Rohde
authors.forename: Sonja
authors.initials: S
authors.lastname: Oehmcke
authors.forename: Lloyd S
authors.initials: LS
authors.lastname: Miller
authors.forename: Ambrose L
authors.initials: AL
authors.lastname: Cheung
authors.forename: Heiko
authors.initials: H
authors.lastname: Herwald
authors.forename: Simon
authors.initials: S
authors.lastname: Foster
authors.forename: Eva
authors.initials: E
authors.lastname: Medina
mesh_terms: D000818:Animals; D016207:Cytokines / Q000097:blood / Q000276:immunology; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism; D004195:Disease Models, Animal; D020022:Genetic Predisposition to Disease; D007113:Immunity, Innate / Q000276:immunology; D053631:Interleukin Receptor Common gamma Subunit / Q000235:genetics / Q000378:metabolism; D007668:Kidney / Q000382:microbiology / Q000473:pathology; D008168:Lung / Q000382:microbiology / Q000473:pathology; D051379:Mice; D008815:Mice, Inbred Strains / Q000235:genetics*; D018345:Mice, Knockout; D009504:Neutrophils / Q000166:cytology / Q000276:immunology; D013203:Staphylococcal Infections / Q000276:immunology*; D013211:Staphylococcus aureus / Q000378:metabolism* / Q000472:pathogenicity; D015996:Survival Rate; D014018:Tissue Distribution
chemical_list: D016207:Cytokines; D004268:DNA-Binding Proteins; D053631:Interleukin Receptor Common gamma Subunit; C499308:Rag2 protein, mouse