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In the present investigation, we compared the metabolism of arachidonic acid in human endometrial stromal cells maintained in monolayer culture with that in human decidual tissues. By gas-chromatographic analysis, the distribution of arachidonic acid in glycerophospholipids and in the neutral lipids of decidual tissues and stromal cells in culture was similar. After the addition of [14C]arachidonic acid to the culture medium, steady-state conditions with respect to radioactive labeling of the lipids of the cells were attained after 24 h, except for phosphatidylethanolamine and neutral lipids. The percentage distribution of [14C]arachidonic acid in the lipids of the cells in culture was as follows: phosphatidylcholine, 41%; phosphatidylserine, 5%; phosphatidylinositol, 19%; phosphatidylethanolamine, 22%; neutral lipids, 11%. This distribution of arachidonic acid among the lipids is similar to that in decidual tissue, except for that in phosphatidylethanolamine. The amount of radioactivity in phosphatidylethanolamine continued to increase up to 72 h whereas that in neutral lipids declined after a maximum amount was present at 4 h. In the cells in monolayer culture, [14C]prostaglandin E2 and [14C]prostaglandin F2 alpha were produced from [14C]arachidonic acid, as is true in superfused decidual tissue. The similarities in arachidonic acid metabolism in these cells to that in decidual tissue are supportive of the proposition that endometrial stromal cells in monolayer culture are an appropriate model for the study of the regulation of arachidonic acid release and prostaglandin formation by endometrium and decidua vera.
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