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Interleukin‐12 production by human polymorphonuclear leukocytes

Interleukin‐12 production by human polymorphonuclear leukocytes Human polymorphonuclear leukocytes (PMN) stimulated by lipopolysaccharide (LPS) produce interleukin‐12 (IL‐12). Both the free IL‐12 p40 chain and minute amounts of the biologically active IL‐12 p70 heterodimers are produced by PMN. Interferon‐γ (IFN‐γ) enhanced the LPS‐induced secretion of both the free IL‐12 p40 chain and the p70 heterodimer by approximately fivefold. As observed for other IL‐12‐producing cell types, the ratio of free p40 chain to p70 heterodimer secreted by LPS‐stimulated PMN was approximately 20:1. LPS induced a 100‐fold increase of IL‐12 p40 mRNA, but had minimal effect on p35 mRNA accumulation, IFN‐γ enhanced the LPS‐induced accumulation of p40 mRNA and directly induced a several‐fold increase in the accumulation of p35 mRNA. Therefore, the combined effect of LPS and IFN‐γ induced sufficient expression of both p40 and p35 to attain production of the biologically active p70 heterodimer at physiologically relevant concentrations. The ratio between p40 and p35 mRNA abundance in PMN stimulated with both LPS and IFN‐γ was approximately 200:1, explaining the secretion of the free p40 chain in much higher concentrations than the p70 heterodimer. IL‐10, an inhibitor of the production of various cytokines in PMN, also suppressed IL‐12 mRNA accumulation and secretion by PMN. Because of the important immunoregulatory function of IL‐12, in particular induction of IFN‐γ production and facilitation of T helper cell type 1 response, the ability of PMN to produce IL‐12 suggests that neutrophils may play an active role in the regulatory interaction between innate resistance and adaptive immunity. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png European Journal of Immunology Wiley

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References (28)

Publisher
Wiley
Copyright
Copyright © 1995 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim
ISSN
0014-2980
eISSN
1521-4141
DOI
10.1002/eji.1830250102
pmid
7843218
Publisher site
See Article on Publisher Site

Abstract

Human polymorphonuclear leukocytes (PMN) stimulated by lipopolysaccharide (LPS) produce interleukin‐12 (IL‐12). Both the free IL‐12 p40 chain and minute amounts of the biologically active IL‐12 p70 heterodimers are produced by PMN. Interferon‐γ (IFN‐γ) enhanced the LPS‐induced secretion of both the free IL‐12 p40 chain and the p70 heterodimer by approximately fivefold. As observed for other IL‐12‐producing cell types, the ratio of free p40 chain to p70 heterodimer secreted by LPS‐stimulated PMN was approximately 20:1. LPS induced a 100‐fold increase of IL‐12 p40 mRNA, but had minimal effect on p35 mRNA accumulation, IFN‐γ enhanced the LPS‐induced accumulation of p40 mRNA and directly induced a several‐fold increase in the accumulation of p35 mRNA. Therefore, the combined effect of LPS and IFN‐γ induced sufficient expression of both p40 and p35 to attain production of the biologically active p70 heterodimer at physiologically relevant concentrations. The ratio between p40 and p35 mRNA abundance in PMN stimulated with both LPS and IFN‐γ was approximately 200:1, explaining the secretion of the free p40 chain in much higher concentrations than the p70 heterodimer. IL‐10, an inhibitor of the production of various cytokines in PMN, also suppressed IL‐12 mRNA accumulation and secretion by PMN. Because of the important immunoregulatory function of IL‐12, in particular induction of IFN‐γ production and facilitation of T helper cell type 1 response, the ability of PMN to produce IL‐12 suggests that neutrophils may play an active role in the regulatory interaction between innate resistance and adaptive immunity.

Journal

European Journal of ImmunologyWiley

Published: Jan 1, 1995

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