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. 1994 Jul;62(7):2930–2939. doi: 10.1128/iai.62.7.2930-2939.1994

Regulation of cytokine production during the expression phase of the anticryptococcal delayed-type hypersensitivity response.

K L Buchanan 1, J W Murphy 1
PMCID: PMC302900  PMID: 7911788

Abstract

Effects of both positive and negative regulatory T cells on cellular infiltration and cytokine production during the expression phase of the anticryptococcal immune response were examined. Tamp cells, which are induced by cryptococcal antigen, significantly amplify the anticryptococcal delayed-type hypersensitivity response, whereas a cascade of T suppressor (Ts) cells inhibits the response and decreases the clearance of Cryptococcus neoformans during an infection. By using the gelatin sponge implantation model, we found that Tamp cells do not stimulate a significant increase in cellular infiltration into the sponges in response to cryptococcal antigen compared with that into delayed-type hypersensitivity-reactive sponges in immune control mice. However, Tamp cells do stimulate significant increases in the production of gamma interferon and interleukin-2 (IL-2) in the antigen-injected sponges over the level of the representative cytokine in antigen-injected sponges from the immune control mice. Likewise, Ts1 cells, induced with cryptococcal antigen, do not significantly affect antigen-induced cellular infiltration into sponges in immune mice. In contrast, decreased levels of gamma interferon and IL-2 are observed in antigen-injected sponges from Ts1-cell-recipient, immunized mice compared with those of the positive immune controls. The presence of either Tamp or Ts1 cells in immunized mice stimulates increased production of IL-5 but not IL-4 over that of the positive immune controls.

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Selected References

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