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- W2023365174 abstract "The interaction of tumor necrosis factor alpha (TNF) with its two membrane-bound receptors initiates intracellular events in which arachidonic acid and its derivatives are involved. In HeLa cells, TNF treatment induces an arachidonic acid-selective, Ca(2+)-dependent cellular phospholipase A2 (cPLA2). By itself, TNF causes a modest increase in cPLA2 activity, but with the Ca2+ ionophore A23187 it provides a strong synergistic action. Within minutes in response to TNF, cPLA2 becomes phosphorylated and in the presence of Ca2+ produces a 3- to 4-fold increase in activity. TNF also increases cPLA2 mRNA and protein expression, an estimated 5-fold increase in an 8-hr period. This increase in cPLA2 activity occurs, therefore, in a biphasic time-dependent manner. Dexamethasone, known to antagonize the action of TNF, is here shown to inhibit TNF-induced gene expression and to prevent the second phase of increase in cPLA2 activation. Our results suggest that the cPLA2 activation may provide a regulatory function and may explain the proinflammatory action of TNF." @default.
- W2023365174 created "2016-06-24" @default.
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- W2023365174 date "1993-05-15" @default.
- W2023365174 modified "2023-10-16" @default.
- W2023365174 title "Cytoplasmic phospholipase A2 activity and gene expression are stimulated by tumor necrosis factor: dexamethasone blocks the induced synthesis." @default.
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- W2023365174 doi "https://doi.org/10.1073/pnas.90.10.4475" @default.
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