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Infection and Immunity logoLink to Infection and Immunity
. 1985 May;48(2):439–445. doi: 10.1128/iai.48.2.439-445.1985

Effects of first-order Cryptococcus-specific T-suppressor cells on induction of cells responsible for delayed-type hypersensitivity.

J W Murphy
PMCID: PMC261339  PMID: 3157646

Abstract

Cell-mediated immunity is an important aspect of host resistance against Cryptococcus neoformans. Using a CBA/J murine model, we demonstrated that injection of cryptococcal antigen (CneF) at dosages sufficient to stimulate the antigenemia observed in cryptococcosis patients induces specific T-cell-mediated suppression of the cryptococcal delayed-type hypersensitivity response. The purpose of this study was to establish whether Lyt 1+, first-order T-suppressor (Ts1) cells block the induction of T cells responsible for delayed-type hypersensitivity (TDH cells) or whether they function by inducing Lyt 2+, efferent suppressor (Ts2) cells. In one set of experiments, suppression was observed when Ts1 cells were adoptively transferred to recipient animals the day before, the day of, or the day after immunization; however, when Ts1 cells were transferred after TDH cells were present, no suppression occurred. In other experiments, putative TDH cells from lymph nodes (LN) or spleens were adoptively transferred from mice after immunization or after a suppressive dose of CneF or adoptive transfer of Ts1 cells and immunization. Delayed-type hypersensitivity could not be transferred with LN or spleen cells from mice receiving the suppressive dose of CneF or the Ts1 cells, even when the LN or spleen cells were treated with anti-Lyt 2.1 antibody and complement to remove any Ts2 cells. Delayed-type hypersensitivity was readily transferred with LN or spleen cells from immunized mice whether the cells were or were not treated with anti-Lyt 2 and complement. Furthermore, the cells in the tolerized LN cell pools responsible for suppression of TDH cell induction were Lyt 1+ 2-, I-J+ cells, which is the phenotype of the Ts1 cells. Taken together, these data indicate that Ts1 cells inhibit the induction of TDH cells. This finding, coupled with the previous demonstration that Ts1 cells or a Ts1 cell-derived soluble factor (TsF1) induces Ts2 cells, establishes that the cryptococcal Ts1 cells are bifunctional in the suppressive pathway.

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Selected References

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