Macrophage activation by interferon-gamma from host-protective T cells is inhibited by interleukin (IL)3 and IL4 produced by disease-promoting T cells in leishmaniasis

European Journal of Immunology
F Y LiewH Ziltener

Abstract

BALB/c mice are highly susceptible to Leishmania major infection. They develop a progressive fatal disseminating disease even with a minimum infecting dose. However, these mice are able to contain the disease if they are exposed to sublethal gamma-irradiation shortly before infection. Earlier studies demonstrated that CD4+ T cells from mice which had recovered from infection (Tr) can adoptively transfer resistance. In contrast, CD4+ cells from mice with progressive disease (Ts) not only failed to protect, but can reverse the protective effect of the Tr cells. Spleen cells from BALB/c mice which had recovered from L. major infection or which had progressive disease were cultured with leishmanial antigens in vitro. The culture supernatant from spleen cells of recovered mice (TrSN) contains high levels of macrophage-activating factor (MAF) activity which can activate peritoneal macrophages to kill 51Cr-labeled P815 cells and to eliminate intracellular parasites as measured by the reduction in [3H]thymidine uptake by residual parasites released from macrophages following sodium dodecyl sulfate treatment. The MAF activity of TrSN parallels that of recombinant interferon-gamma (IFN-gamma). In contrast, culture supernatant of spleen c...Continue Reading

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