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Effect of age on susceptibility to Salmonella Typhimurium infection in C57BL/6 mice

¹ Nutritional Immunology Laboratory, Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University, 711 Washington Street, Boston, MA 02111, USA

² Department of Microbiology and Molecular Biology, Tufts University, 136 Harrison Avenue, Boston, MA 02111, USA

Correspondence
Simin Nikbin Meydani
simin.meydani{at}tufts.edu

Received June 4, 2009
Accepted August 28, 2009

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 Salmonella enterica serovar Typhimurium (S. 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 S. Typhimurium. In this model, old mice inoculated orally with doses of 3x10⁸ or 1x10⁶ c.f.u. S. Typhimurium had significantly greater S. 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 S. Typhimurium infection, old mice failed to increase ex vivo 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 S. 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 S. Typhimurium infection compared to young mice.