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. 1988 Feb 15;250(1):125–132. doi: 10.1042/bj2500125

Tumour necrosis factor (cachectin) induces phospholipase A2 activity and synthesis of a phospholipase A2-activating protein in endothelial cells.

M A Clark 1, M J Chen 1, S T Crooke 1, J S Bomalaski 1
PMCID: PMC1148824  PMID: 3128274

Abstract

Tumour necrosis factor (TNF) is an important mediator of endotoxin-induced vascular collapse and other inflammatory reactions. Eicosanoids have been implicated in the pathogeensis of these responses. In order to explore further the potential interactions between TNF and eicosanoid metabolism in eliciting vascular responses, we studied the effects of TNF on the bovine endothelial cell line CPAE. TNF induced cellular retraction observed by light microscope. This morphological change was monitored by the passage of iodinated protein A between adjacent cells and by release of [3H]arachidonic acid metabolites from cells. Both the morphological and functional responses were abrogated by inhibition of eicosanoid synthesis with BW755c. The release of [3H]arachidonic acid metabolites appeared to be mediated by a transient increase in phospholipase A2 activity. Phospholipase C activity was not affected by TNF. The maximal increase in phospholipase A2 activity occurred at 5 min following the addition of TNF. Phospholipase A2 activation, [3H]arachidonic acid-metabolite synthesis and passage of iodinated protein A, required both RNA and protein synthesis and were associated with an increase in the synthesis of a recently described phospholipase A2-activating protein. The Bordetella pertussis toxin, islet-activating protein, also inhibited the increase in phospholipase A2 activity, the release of [3H]arachidonic acid metabolites and the passage of iodinated protein A, suggesting that the TNF receptor-ligand interaction resulting in cellular retraction, phospholipase A2 activation and eicosanoid synthesis, is coupled through the Ni guanine nucleotide regulatory protein in these cells.

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Selected References

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