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J. Biol. Chem., Vol. 261, Issue 19, 8624-8632, 07, 1986

Regulation of interleukin 1 production by mouse peritoneal macrophages. Effects of arachidonic acid metabolites, cyclic nucleotides, and interferons

SR Brandwein

The effects of prostaglandin E2 (PGE2), cyclic nucleotides, leukotriene B4 (LTB4), and interferons on interleukin 1 (IL 1) production by lipopolysaccharide (LPS)-stimulated C3H/HeNCrl mouse peritoneal macrophages were studied. IL 1 production was inhibited by PGE2, the adenosine 3':5'-monophosphate analog dibutyryl cAMP, the cAMP agonist isoproterenol, and the phosphodiesterase inhibitor isobutylmethylxanthine. These agents were more inhibitory when added early in the latent phase of IL 1 synthesis following stimulation with LPS rather than just prior to release of IL 1 into the medium. Production of both the intracellular and extracellular forms of IL 1 was blocked by PGE2 and cAMP. Suppression of LPS-induced IL 1 production by PGE2 was prevented by leukocyte alpha-interferon. Moreover, alpha-interferon augmented LPS-induced IL 1 production but did not stimulate IL 1 production in the absence of LPS. Immune gamma- interferon markedly inhibited LPS-stimulated IL 1 production. The lipoxygenase inhibitor eicosa-5,8,11,14-tetraynoic acid suppressed, whereas 3-amino-1-(3-trifluoromethylphenyl)-2-pyrazoline augmented, LPS- induced IL 1 production. The opposing effects of these agents suggested that lipoxygenase metabolites do not act as inducers of IL 1 production. Purified LTB4 did not stimulate base-line or augment LPS- induced IL 1 production (both intracellular and extracellular forms). Moreover, calcium ionophore A23187 (a lipoxygenase activator) did not stimulate IL 1 production, alone or in combination with LTB4. Thus, net IL 1 production by macrophages may be regulated by a balance between the effects of PGE2, cAMP, alpha-interferon, and gamma-interferon, but not LTB4.
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