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Production by NK Cells1



*
First Department of Internal Medicine, Faculty of Medicine, University of the Ryukyus, Okinawa, Japan;
Laboratory Animal Research Center, Institute of Medical Science, University of Tokyo, Tokyo, Japan;
Department of Host Defense, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan; and
§
Fujisaki Institute, Hayashibara Biochemical Laboratories, Okayama, Japan
The aim of this study was to examine the contribution of IL-18 in
host defense against infection caused by Cryptococcus
neoformans in mice with defective IL-12 production. Experiments
were conducted in mice with a targeted disruption of the gene for
IL-12p40 subunit (IL-12p40-/- mice). In these
mice, host resistance was impaired, as shown by increased number of
organisms in both lungs and brains, compared with control mice. Serum
IFN-
was still detected in these mice at a considerable level
(2030% of that in control mice). The host resistance was moderately
impaired in IL-12p40-/- mice compared with
IFN-
-/- mice. Neutralizing
anti-IFN-
mAb further increased the lung burdens of organisms.
In addition, treatment with neutralizing anti-IL-18 Ab almost
completely abrogated the production of IFN-
and also impaired the
host resistance. Host resistance in
IL-12p40-/-
IL-18-/- mice was more profoundly impaired
than in IL-12p40-/- mice. Administration of
IL-12 as well as IL-18 increased the serum levels of IFN-
and
significantly restored the reduced host resistance. Spleen cells
obtained from infected IL-12p40-/- mice did
not produce any IFN-
upon restimulation with the same organisms,
while those from infected and IL-12-treated mice produced IFN-
. In
contrast, IL-18 did not show such effect. Finally, depletion of NK
cells by anti-asialo GM1 Ab mostly abrogated the residual
production of IFN-
in IL-12p40-/- mice.
Our results indicate that IL-18 contributes to host resistance to
cryptococcal infection through the induction of IFN-
production by
NK cells, but not through the development of Th1 cells, under the
condition in which IL-12 synthesis is deficient.
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