1887

Abstract

The prevalence of opportunistic fungal infections has increased dramatically among the aged population in recent years. This work investigated the effect of ageing on murine defences against . Aged C57BL/6 mice that were experimentally infected intravenously had a significantly impaired survival and a higher tissue fungal burden compared with young mice. production of tumour necrosis factor (TNF)- by macrophages from aged mice in response to yeast cells and hyphae of was significantly lower than production by macrophages from young mice. production of cytokines, such as TNF- and gamma interferon (IFN-), by antigen-stimulated splenocytes from mice intravenously infected with cells was also diminished in old mice. This decrease in production of T helper 1 cytokines in old mice correlated with a diminished frequency of IFN--producing CD4 T lymphocytes, although the ability to develop an acquired resistance upon vaccination (primary sublethal infection) of mice with the low-virulence PCA2 strain was not affected in aged mice. The diversity of antigens recognized by -specific antibodies in sera from infected aged mice was clearly diminished when compared with that from infected young mice. Taken together, these data show that aged mice develop an altered innate and adaptive immune response to and are more susceptible to systemic primary candidiasis.

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2006-12-01
2024-03-29
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