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1



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Institute of Clinical Microbiology and Immunology, University of Erlangen-Nürnberg, Erlangen; and
Laboratory of Biochemistry, Chair for Interfacial Engineering, University of Stuttgart, Stuttgart, Germany; and
The Picower Institute for Medical Research, Manhasset, NY 11030
Macrophage migration inhibitory factor (MIF) is a product of
activated T cells, anterior pituitary cells, and macrophages. MIF plays
an important role in LPS-induced shock and delayed-type
hypersensitivity. Furthermore, MIF exhibits a proinflammatory spectrum
of action, promoting TNF-
production by macrophages, and
counter-regulates glucocorticoid suppression of cytokine production.
Here, we report that purified recombinant MIF activates murine
macrophages to kill Leishmania major, with maximal
effects at concentrations above 1 µg/ml. This MIF-mediated activation
is specific, since it can be blocked completely by anti-MIF mAb.
The MIF-mediated activation is dependent on TNF-
produced
endogenously by macrophages, because the administration of
anti-TNF-
antiserum markedly reduced the MIF effect. No
MIF-mediated activation was observed in macrophages derived from TNF
receptor p55 knockout mice, thus demonstrating the requirement
of the smaller TNF receptor molecule for autocrine TNF-
signaling. A
highly specific inhibitor of the inducible nitric oxide synthase
(iNOS),
L-N6-(1-iminoethyl)lysine,
dihydrochloride, also inhibited the action of MIF, suggesting an
important role for iNOS in the antiparasitic properties of MIF. In line
with this, no MIF-mediated activation was detected analyzing
macrophages derived from iNOS-deficient mice. The effect of MIF was
blocked completely by the macrophage-deactivating cytokines IL-10,
IL-13, and TGF-ß. Finally, the expression of MIF mRNA and protein was
up-regulated in lymph nodes of mice during the first week after
infection with L. major. MIF therefore represents a
cytokine involved not only in the recruitment of proinflammatory cells
during infection but also in the complex regulation of the
antimicrobial activity of these cells.
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