Citations to this article

Interaction between lymphocytes and platelets in the synthesis of prostacyclin.
K K Wu, … , C E Manner, E R Hall
K K Wu, … , C E Manner, E R Hall
Published June 1, 1987
Citation Information: J Clin Invest. 1987;79(6):1601-1606. https://doi.org/10.1172/JCI112995.
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Research Article

Interaction between lymphocytes and platelets in the synthesis of prostacyclin.

Abstract

To test the hypothesis that prostacyclin (PGI2) is formed via a biochemical interaction between platelets and lymphocytes, we measured eicosanoids by high performance liquid chromatography (HPLC) and radioimmunoassay (RIA). A distinct 6-keto-prostaglandin F1 alpha (6KPGF1 alpha) peak was noted when [14C]arachidonic acid ([14C]AA) was added to the mixed cell preparations which was increased by pretreating platelets with 1-benzylimidazole (1-BI). Lymphocytes prelabeled with [14C]AA failed to form 6KPGF1 alpha when stimulated with phytohemagglutinin (PHA) or ionophore A23187. When the prelabeled platelets were suspended together with aspirin-treated lymphocytes and stimulated with ionophore, thrombin, or collagen, a 6KPGF1 alpha peak was detected and enhanced by 1-BI. These results were supported by quantifying the 6KPGF1 alpha content in the HPLC-purified fraction by RIA. Adding prostaglandin H2 (PGH2) directly to lymphocytes led to 6KPGF1 alpha production. Platelet aggregation and release were inhibited by lymphocytes in a dose-related manner. We conclude that lymphocytes possess PGI2 synthase activity which is capable of converting platelet-derived PGH2 into PGI2. PGI2 formed is sufficient to inhibit platelet function.

Authors

K K Wu, A C Papp, C E Manner, E R Hall

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Citations to this article (24)

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Modern high-performance liquid chromatographic-radioimmunoassay strategies for the study of eicosanoids in biological samples
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