NDLI: Histaminergic regulation of interferon-gamma (IFN-γ) production by human natural killer (NK) cells

Content Provider	PubMed Central
Author	Asea, A. Hansson, M. Czerkinsky, C. Houze, T. Hermodsson, S. StrannegÅrd, Ö Hellstrand, K.
Copyright Year	1996
Abstract	Monocytes, recovered from human peripheral blood by counter-current centrifugal elutriation, effectively inhibit the production of IFN-γ by CD3−/56+ NK cells in response to IL-2. This study aimed at defining the nature of the inhibitory signal, particularly the importance of monocyte-derived reactive metabolites of oxygen. It was found that monocytes recovered from patients with chronic granulomatous disease (CGD), a condition characterized by deficient NADPH-oxidase activity of phagocytes, did not inhibit IFN-γ production by NK cells. Further, catalase, a scavenger of hydrogen peroxide, completely reversed the inhibitory signal, whereas scavengers of the superoxide anion, hypohalous acids, the hydroxyl radical, or nitric oxide synthesis inhibitors such as L-NMMA were ineffective. Inhibition of IFN-γ production was operating on a pre-translational level, as indicated by the inability of enriched NK cells to accumulate IFN-γ mRNA in the presence of elutriated monocytes. Hydrogen peroxide, at micromolar concentrations, reconstituted the inhibition of IFN-γ production when added to enriched NK cells. Histamine, a biogenic amine which inhibits the generation of reactive oxygen metabolites in monocytes, abrogated the inhibition of IFN-γ production in NK cells; by this mechanism, histamine strongly synergized with IL-2 to induce IFN-γ in mixtures of NK cells and monocytes. The synergizing effect of histamine was specifically mediated by H2-type histamine receptors. We conclude that: (i) the induction of IFN-γ mRNA in NK cells is effectively down-regulated by products of the oxidative metabolism of monocytes; and (ii) histamine effectively enhances IFN-γ production by preventing monocyte-induced oxidative damage to NK cells.
Related Links	http://dx.doi.org/10.1046/j.1365-2249.1996.d01-755.x
Ending Page	382
Page Count	7
Starting Page	376
File Format	PDF
ISSN	00099104
e-ISSN	13652249
Journal	Clinical and Experimental Immunology
Issue Number	2
Volume Number	105
Language	English
Publisher	Blackwell Science Inc
Publisher Date	1996-07-01
Access Restriction	Open
Rights Holder	Blackwell Science Inc
Subject Keyword	Immunology Immunology and Allergy Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Immunology and Allergy Immunology

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