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


, : Regulation of interleukin 1 production by mouse peritoneal macrophages. Effects of arachidonic acid metabolites, cyclic nucleotides, and interferons. Journal of Biological Chemistry 261(19): 8624-8632

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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Accession: 006288799

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