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CUTTING EDGE |
Department of Immunology, University of Glasgow, Western Infirmary, Glasgow, G11 6NT United Kingdom.
MRL/MP-lpr/lpr (MRL/lpr) mice
have a single mutation (lpr) of the fasapoptosis gene. The mutant mice developed significantly
smaller lesions than the wild-type mice at the earlier stage of
infection with the intracellular protozoan parasite Leishmania
major. However, while all the wild-type mice achieved complete
lesion resolution, the disease in the mutant mice progressed
inexorably. The mutant mice had more IL-12 and nitrite/nitrate in the
serum than wild-type mice following infection. Lymphoid cells from
infected MRL/lpr mice produced more IFN-
but less IL-4
and IL-5 than cells from MRL-+/+ mice. Peritoneal macrophages from the
mutant mice also produced more IL-12 and NO after stimulation with LPS.
Thus, Fas expression is essential for resistance against leishmaniasis,
and Fas-mediated apoptosis may form an integral part of the
Th1-mediated microbicidal function.
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