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Natural killer (NK) cells from individuals unexposed to Leishmania organisms proliferate with high interferon (IFN)-gamma secretion in response to crude Leishmania antigen preparations. In an attempt to identify the molecules that induce blood cells to proliferate and to secrete cytokines, we tested the effect of a 36-kDa Leishmania homologue of receptors for activated C-kinase (LACK) on peripheral blood mononuclear cells from unexposed individuals. Mainly CD8(+) and NK cells proliferated in response to LACK. At both the mRNA and soluble protein level, the main sources for LACK-induced IFN-gamma and interleukin (IL)-10 were T and NK cells. Furthermore, in the presence of anti-major histocompatibility complex (MHC) class II antibody, there was inhibition of LACK responses in both CD4(+) and CD16/56(+) cells, with a marked decrease in IFN-gamma but with an increase in IL-10 production. We conclude that the response to LACK is part of the response to Leishmania organisms in unexposed donors described elsewhere. That this NK-dominated response is MHC class II sensitive, whether through a direct or indirect effect, is discussed.

the journal of infectious diseases (online. university of chicago press)/the journal of infectious diseases

A<i>Leishmania</i>Homologue of Receptors for Activated C‐Kinase (LACK) Induces Both Interferon‐γ and Interleukin‐10 in Natural Killer Cells of Healthy Blood Donors

ALeishmaniaHomologue of Receptors for Activated C‐Kinase (LACK) Induces Both Interferon‐γ and Interleukin‐10 in Natural Killer Cells of Healthy Blood Donors