Abstract
The effects of nonsteroidal anti-inflammatory drugs (NSAIDs), mofezolac, indomethacin, sodium diclofenac, and zaltoprofen, on the production of interleukin-1 receptor antagonist (IL-1ra) were examined in cultured human peripheral blood mononuclear cells (PBMC). Among the NSAIDs tested, mofezolac and sodium diclofenac were found to stimulate the mRNA expression for IL-1ra without affecting the mRNA expression for IL-1β. These two drugs also stimulated the secretion of IL-1ra by PBMC in the absence of bacterial lipopolysaccharide (LPS), however, the stimulatory effect of sodium diclofenac diminished in the presence of LPS. Mofezolac suppressed the mRNA expression for IL-1β in PBMC stimulated with exogenous IL-1β, indicating the secreted IL-1ra in the presence of mofezolac to be biologically active. Since IL-1ra suppresses the function of IL-1, a pro-inflammatory cytokine, the stimulatory effect of such NSAIDs as mofezolac on IL-1ra production could also be one of the mechanisms involved in its anti-inflammatory and antinociceptive actions.
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