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Interleukin 10- and Fcgamma Receptor-deficient Mice Resolve Leishmania Mexicana Lesions

Overview
Journal Infect Immun
Date 2005 Mar 24
PMID 15784551
Citations 41
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Abstract

Infection of C57BL/6 (B6) mice with Leishmania mexicana is associated with a minimal immune response and chronic disease. Here we show that B6 interleukin 10-/- (IL-10-/-) mice resolve their lesions and exhibit increased gamma interferon (IFN-gamma), nitric oxide production, and delayed-type hypersensitivity. This enhanced resistance was dependent upon IL-12p40, since treatment of L. mexicana-infected IL-10-/- mice with anti-IL-12p40 monoclonal antibody abrogated healing. Antibody-opsonized L. mexicana induced IL-10 production by B6 macrophages in vitro, implicating antibody binding to Fc receptors as a mechanism involved in IL-10 production in this infection. Furthermore, B6 FcRgamma-/- mice resolve L. mexicana lesions, and lymph node cells from these mice produced less IL-10 and more IFN-gamma than cells from infected wild-type mice. These data demonstrate that removal of IL-10 or FcgammaR leads to resolution of L. mexicana disease and support a model in which ligation of FcgammaR by L. mexicana-bound immunoglobulin G promotes IL-10 production, leading to chronic disease.

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