Abstract
Human recombinant tumor necrosis factors alpha and beta (TNF-alpha and TNF-beta), at and above 1 ng/ml (approximately equal to 70 pM), caused a dose- and time-dependent enhancement of 45Ca release from neonatal mouse calvarial bones in vitro. In addition, TNF-alpha and TNF-beta (3-100 ng/ml) caused a dose-dependent stimulation of prostaglandin E2 (PGE2) formation in the calvarial bones. TNF-alpha also enhanced the biosynthesis of PGI2, as assessed by analysis of the stable breakdown product 6-keto-PGF1 alpha. The stimulatory actions of TNF-alpha and TNF-beta on PGE2 formation was maximal at 12 h. Indomethacin, flurbiprofen, and meclofenamic acid, three structurally unrelated nonsteroidal antiinflammatory drugs, abolished PGE2 biosynthesis induced by TNF-alpha and TNF-beta (100 ng/ml). The 45Ca release stimulated by TNF-alpha and TNF-beta (100 ng/ml), however, was only slightly reduced by indomethacin, flurbiprofen, and meclofenamic acid. The partial inhibitory effect of indomethacin on 45Ca release was seen over a wide range of TNF-alpha concentrations, without affecting the concentration producing half-maximal stimulatory response. TNF-alpha and TNF-beta (100 ng/ml) stimulated bone matrix breakdown, as assessed by analysis of ...Continue Reading
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