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Journal Article | Research Support, U.S. Gov't, P.H.S.

Role of tumor necrosis factor and gamma interferon in acquired resistance to Cryptococcus neoformans in the central nervous system of mice.

K Aguirre, E A Havell, G W Gibson, L L Johnson
K Aguirre
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E A Havell
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G W Gibson
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L L Johnson
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ABSTRACT

Although naive C.B-17 and BALB/cBy mice die of meningoencephalitis within 5 weeks of intravenous infection with an opportunistic strain of Cryptococcus neoformans, immunized mice express an acquired, CD4+ T-cell-dependent immunity and survive an intravenous infection. Infusion of lymphocytes from immune mice into severe combined immunodeficiency (SCID) mice renders these mice more resistant to cryptococcal brain infection than uninfused controls. We have investigated the role of gamma interferon (IFN-gamma) and tumor necrosis factor (TNF) in acquired resistance to C. neoformans. Neutralization of either IFN-gamma or TNF impaired resistance of immune BALB/cBy or C.B-17 mice to cryptococci. At 10 days postinfection, there were approximately 10 times as many yeast cells in the brains of mice treated with either anticytokine antibody as in the brains of mice treated with control antibody. Simultaneous neutralization of IFN-gamma and TNF further exacerbated infection. Neutralization of IFN-gamma or TNF also impaired resistance in immune lymphocyte-infused SCID mice, resulting in significantly higher yeast burdens in brains of cytokine-neutralized mice than in brains of controls. Concurrent neutralization of IFN-gamma and TNF rendered SCID recipients of immune cells equivalent to uninfused SCID mice with respect both to brain yeast burdens at 10 days and to survival. Anti-TNF treatment alone also curtailed survival. Histological examination of the brains of cytokine-neutralized mice revealed deficiencies in ability to focus inflammatory cells at brain lesions. These data demonstrate that both IFN-gamma and TNF are important mediators of acquired resistance to cryptococcal meningoencephalitis.

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Role of tumor necrosis factor and gamma interferon in acquired resistance to Cryptococcus neoformans in the central nervous system of mice.
K Aguirre, E A Havell, G W Gibson, L L Johnson
Infection and Immunity May 1995, 63 (5) 1725-1731; DOI:

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Role of tumor necrosis factor and gamma interferon in acquired resistance to Cryptococcus neoformans in the central nervous system of mice.
K Aguirre, E A Havell, G W Gibson, L L Johnson
Infection and Immunity May 1995, 63 (5) 1725-1731; DOI:
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