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,§
,§
*
Third Department of Internal Medicine,
Department of Immunology and Medical Zoology,
Department of Biochemistry and
§
Laboratory of Host Defenses Institute for Advanced Medical Sciences, Hyogo College of Medicine, Nishinomiya, Hyogo, Japan;
¶
Fujisaki Institute, Hayashibara Biochemical Laboratories, Okayama, Japan;
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Center for Experimental Medicine, Institute of Medical Science, University of Tokyo, Tokyo, Japan; and
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Department of Immunology, Juntendo University School of Medicine, Tokyo, Japan
IL-18 is a powerful inducer of IFN-
production, particularly in
collaboration with IL-12. IL-18, like IL-12, also augments NK activity.
Here we investigated the molecular mechanism underlying the
up-regulation of killing activity of NK cells by IL-18. IL-18, like
IL-12, dose dependently enhanced NK activity of splenocytes. This
action was further enhanced by costimulation with IL-12. Treatment with
anti-IL-2R Ab did not affect IL-18- and/or IL-12-augmented NK
activity, and splenocytes from IFN-
-deficient mice showed enhanced
NK activity following stimulation with IL-12 and/or IL-18. Splenocytes
from the mice deficient in both IL-12 and IL-18 normally responded to
IL-18 and/or IL-12 with facilitated NK activity, suggesting that
functional NK cells develop in the absence of IL-12 and IL-18. IL-18R,
as well as IL-12R mRNA, was constitutively expressed in splenocytes
from SCID mice, which lack T cells and B cells but have intact NK
cells, and in those from IL-12 and IL-18 double knockout mice. NK cells
isolated from SCID splenocytes expressed IL-18R on their surface.
IL-18, in contrast to IL-12, did not enhance mRNA expression of
perforin, a key molecule for exocytosis-mediated cytotoxicity. However,
pretreatment with concanamycin A completely inhibited this IL-18-
and/or IL-12-augmented NK activity. Furthermore, IL-18, like IL-12,
failed to enhance NK activity of splenocytes from perforin-deficient
mice. These data suggested that NK cells develop and express IL-12R and
IL-18R in the absence of IL-12 or IL-18, and that both IL-18 and IL-12
directly and independently augment perforin-mediated cytotoxic activity
of NK cells.
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