PMID: 9440135Jan 24, 1998Paper

Tumor necrosis factor-alpha promotes sustained cyclooxygenase-2 expression: attenuation by dexamethasone and NSAIDs

Prostaglandins
D J Perkins, D A Kniss

Abstract

Prostaglandin (PG) release is characteristic of most inflammatory diseases. The committed step in the formation of free arachidonic acid into PG products is catalyzed by cyclooxygenase (COX, prostaglandin H2 synthase, PGHS), which exists as two genetically distinct isoforms. COX-1 is constitutively expressed and produces PGs and thromboxane A2 during normal physiologic activities, while COX-2 is an inducible enzyme stimulated by growth factors, lipopolysaccharide, and cytokines during inflammation or cell injury. Proinflammatory cytokines such as tumor necrosis factor-alpha (TNF-alpha) released into the amniotic fluid in the setting of infection have been proposed to signal amnion and decidual cells to produce PGs that may culminate in preterm labor. However, since the molecular control of this phenomenon has not been established, this study used amnion-derived WISH cells to determine if TNF-alpha promoted the formation of PGs through COX-2 activity. Treatment of WISH cells with TNF-alpha (0.1 ng/mL-100 ng/mL) caused a dose-dependent increase in COX-2 expression and the subsequent biosynthesis of PGE2 that persisted for at least 48 hrs. In contrast, COX-1 mRNA and protein levels were unaltered by TNF-alpha treatment as determin...Continue Reading

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