1887

Abstract

Ageing is associated with a decline in immune function, which predisposes the elderly to a higher incidence of infections. Information on the mechanism of the age-related increase in susceptibility to serovar Typhimurium ( Typhimurium) is limited. In particular, little is known regarding the involvement of the immune response in this age-related change. We employed streptomycin (Sm)-pretreated C57BL/6 mice to develop a mouse model that would demonstrate age-related differences in susceptibility and immune response to Typhimurium. In this model, old mice inoculated orally with doses of 3×10 or 1×10 c.f.u. Typhimurium had significantly greater Typhimurium colonization in the ileum, colon, Peyer's patches, spleen and liver than young mice. Old mice had significantly higher weight loss than young mice on days 1 and 2 post-infection. In response to Typhimurium infection, old mice failed to increase production of IFN- and TNF- in the spleen and mesenteric lymph node cells to the same degree as observed in young mice; this was associated with their inability to maintain the presence of neutrophils and macrophages at a ‘youthful’ level. These results indicate that Sm-pretreated C57BL/6 old mice are more susceptible to Typhimurium infection than young mice, which might be due to impaired IFN- and TNF- production as well as a corresponding change in the number of neutrophils and macrophages in response to Typhimurium infection compared to young mice.

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2009-12-01
2024-12-09
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