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Cryptococcus neoformans is a yeast that causes cryptococcosis, a life-threatening disease that develops following inhalation and dissemination of the organisms. C. neoformans has a predilection for the central nervous system (CNS) and mortality is most frequently associated with meningoencephalitis. Susceptibility to cryptococcosis is increased in patients with deficiencies in cell-mediated immunity (CMI). Because cryptococcal CNS infections are associated with mortality and diagnosis of cryptococcosis is often not made until after dissemination to the CNS, a better understanding of host defense mechanisms against C. neoformans in the CNS is needed to design improved therapies for immunocompromised individuals suffering from cryptococcosis. Using a mouse model, we previously described a protective cell-mediated immune response induced in the periphery that limited the growth of C. neoformans in the CNS. In the current investigation, we examined cytokine and chemokine expression in the CNS to identify factors important in achieving protective immunity. We observed increased expression of IL-1beta, TNF-alpha, IFN-gamma, MCP-1, RANTES, and IP-10 in C. neoformans-infected brains of immune mice compared to control mice suggesting that these cytokines and chemokines are associated with the protective immune response. Furthermore, the Th1-type cytokines TNF-alpha and IFN-gamma, but not the Th2 cytokines IL-4 and IL-5, were secreted at significantly higher levels in C. neoformans-infected brains of immune mice compared to control mice. Our results demonstrate that cytokines and chemokines associated with CMI are produced following infection in the CNS of immunized mice, and the expression of these factors correlates with protection against C. neoformans in the CNS.

medical mycology

Cytokine and chemokine expression in the central nervous system associated with protective cell-mediated immunity against<i>Cryptococcus neoformans</i>

Cytokine and chemokine expression in the central nervous system associated with protective cell-mediated immunity againstCryptococcus neoformans