PMID: 6408642Jul 1, 1983Paper

Leukotriene C promotes prostacyclin synthesis by human endothelial cells

Proceedings of the National Academy of Sciences of the United States of America
E B CramerW A Scott

Abstract

Cultured endothelial cells from human umbilical vein were labelled with [3H]arachidonic acid for 16 hr. The radiolabel was localized primarily in phospholipids (93%) and 73% was distributed equally between phosphatidylcholine and phosphatidylethanolamine. Leukotriene C (10-1,000 nM) promoted a dose-dependent release of radiolabel into the culture medium. This response was 3.3 times control values at 100 nM. The major arachidonic acid metabolite synthesized was prostacyclin, which was 33% of the total released radiolabel. Endothelial cells also released small amounts of prostaglandin F2 alpha (6.1%), unidentified lipoxygenase products (14.8%), and unreacted arachidonic acid (33%). The 30-min time course of release was independent of the leukotriene C concentration used. Leukotriene D at similar concentrations also promoted endothelial cells to release primarily prostacyclin and unreacted arachidonic acid. The release of prostacyclin, a potent vasodilator agent, may be an important mediator in slow reacting substance effects on the vasculature.

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