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Journal Article | Research Support, Non-U.S. Gov't

Interleukin-12 (IL-12) and IL-18 synergistically induce the fungicidal activity of murine peritoneal exudate cells against Cryptococcus neoformans through production of gamma interferon by natural killer cells.

T Zhang, K Kawakami, M H Qureshi, H Okamura, M Kurimoto, A Saito
T Zhang
First Department of Internal Medicine, Faculty of Medicine, University of the Ryukyus, Okinawa, Japan.
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K Kawakami
First Department of Internal Medicine, Faculty of Medicine, University of the Ryukyus, Okinawa, Japan.
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M H Qureshi
First Department of Internal Medicine, Faculty of Medicine, University of the Ryukyus, Okinawa, Japan.
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H Okamura
First Department of Internal Medicine, Faculty of Medicine, University of the Ryukyus, Okinawa, Japan.
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M Kurimoto
First Department of Internal Medicine, Faculty of Medicine, University of the Ryukyus, Okinawa, Japan.
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A Saito
First Department of Internal Medicine, Faculty of Medicine, University of the Ryukyus, Okinawa, Japan.
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ABSTRACT

We examined the ability of interleukin-12 (IL-12) and IL-18 to induce the production of gamma interferon (IFN-gamma) and nitric oxide (NO) by murine peritoneal exudate cells (PEC) and to stimulate the growth-inhibitory activity of these cells against Cryptococcus neoformans. PEC produced IFN-gamma and NO when stimulated with a combination of IL-12 and IL-18 but little or no IFN-gamma or NO when either cytokine was used alone. PEC anticryptococcal activity was mediated by IFN-gamma and NO production, since it was completely inhibited by a neutralizing anti-IFN-gamma monoclonal antibody (MAb) and N(G)-monomethyl-L-arginine, a competitive inhibitor of NO synthesis, respectively. To identify the IFN-gamma-producing cells among PEC stimulated with IL-12 and IL-18, we depleted NK cells, gammadelta T cells, or CD4+ T cells by treating PEC with specific Abs and complement. NK cell depletion strongly suppressed IFN-gamma production and almost completely inhibited NO production and anticryptococcal activity, while depletion of other cells had no such influence. Alternatively, purified NK cells by two cycles of glass adherence and magnetic separation with anti-CD3, -CD4, -CD8, and -B220 MAbs produced a greater amount of IFN-gamma by stimulation with IL-12 and IL-18 than unseparated non-glass-adherent PEC. Our results demonstrated that IL-12 and IL-18 synergistically induced NO-dependent anticryptococcal activity of PEC by stimulating NK cells to produce IFN-gamma.

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Interleukin-12 (IL-12) and IL-18 synergistically induce the fungicidal activity of murine peritoneal exudate cells against Cryptococcus neoformans through production of gamma interferon by natural killer cells.
T Zhang, K Kawakami, M H Qureshi, H Okamura, M Kurimoto, A Saito
Infection and Immunity Sep 1997, 65 (9) 3594-3599; DOI:

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Interleukin-12 (IL-12) and IL-18 synergistically induce the fungicidal activity of murine peritoneal exudate cells against Cryptococcus neoformans through production of gamma interferon by natural killer cells.
T Zhang, K Kawakami, M H Qureshi, H Okamura, M Kurimoto, A Saito
Infection and Immunity Sep 1997, 65 (9) 3594-3599; DOI:
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