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Journal Article | Research Support, Non-U.S. Gov't

A role for B cells in resistance to Cryptococcus neoformans in mice.

K M Aguirre, L L Johnson
K M Aguirre
Trudeau Institute, Saranac Lake, New York 12983, USA.
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L L Johnson
Trudeau Institute, Saranac Lake, New York 12983, USA.
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ABSTRACT

The role of B cells in immunity to Cryptococcus neoformans was investigated. Genetically targeted, B-cell-deficient mice (mu Mt) examined at various times after intravenous infection with C. neoformans 184 had lung and brain yeast burdens that were equivalent to tissue burdens in control B-cell-sufficient mice. Both B-cell-deficient and B-cell-sufficient control mice were effectively vaccinated by a sublethal intratracheal instillation of strain 184 yeast against a systemic infection with the C. neoformans strain carrying ura5; vaccinated control and vaccinated B-cell-deficient mice had equivalent brain and lung burdens of the ura5 strain 10 days after intravenous rechallenge. Additionally, B-cell-deficient and B-cell-sufficient vaccinated mice survived an intravenous rechallenge with a dose of yeast cells which is normally lethal for unimmunized mice. In further studies of the role of B cells in murine cryptococcosis, SCID mice were reconstituted with lymphocytes from B-cell-deficient and B-cell-sufficient mice. SCID mice reconstituted with lymphocytes from vaccinated B-cell-deficient animals failed to express effective adoptive immunity to C. neoformans brain infection. In contrast, SCID mice reconstituted with lymphocytes from vaccinated B-cell-sufficient mice had 10-fold fewer yeast cells in their brains than did uninfused SCID controls. However, SCID mice given lymphocytes from B-cell-deficient immune donors had fewer yeast cells in their lungs than did uninfused controls. Fewer CD4+ lymphocytes were recovered at 7 and 11 days after infection from the peripheral blood and spleens of SCID mice reconstituted with lymphocyte suspensions from B-cell-deficient animals than from the peripheral blood and spleens of SCID mice reconstituted with suspensions from B-cell-sufficient control donors. These data suggest that B cells can play an important role in host defense against Cryptococcus in the brain under conditions in which T-cell-mediated immunity is impaired.

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A role for B cells in resistance to Cryptococcus neoformans in mice.
K M Aguirre, L L Johnson
Infection and Immunity Feb 1997, 65 (2) 525-530; DOI:

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A role for B cells in resistance to Cryptococcus neoformans in mice.
K M Aguirre, L L Johnson
Infection and Immunity Feb 1997, 65 (2) 525-530; DOI:
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