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The Journal of Immunology, 1999, 162: 1662-1668.
Copyright © 1999 by The American Association of Immunologists

IL-18 Up-Regulates Perforin-Mediated NK Activity Without Increasing Perforin Messenger RNA Expression by Binding to Constitutively Expressed IL-18 Receptor1

Yasuko Hyodo*, Kiyoshi Matsui*, Nobuki Hayashi*, Hiroko Tsutsui{dagger}, Shin-ichiro Kashiwamura§, Hiroshi Yamauchi, Keisai Hiroishi*, Kiyoshi Takeda{ddagger}, Yoh-ichi Tagawa||, Yoichiro Iwakura||, Nobuhiko Kayagaki#, Masashi Kurimoto, Haruki Okamura§, Toshikazu Hada*, Hideo Yagita#, Shizuo Akira{ddagger}, Kenji Nakanishi2{dagger} and Kazuya Higashino*

* Third Department of Internal Medicine, {dagger} Department of Immunology and Medical Zoology, {ddagger} 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; || Center for Experimental Medicine, Institute of Medical Science, University of Tokyo, Tokyo, Japan; and # Department of Immunology, Juntendo University School of Medicine, Tokyo, Japan

IL-18 is a powerful inducer of IFN-{gamma} 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-{gamma}-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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