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Abstract
Previous studies using arachidonic acid and preferential inhibitors of the arachidonic acid pathway have implicated the lipoxygenase system in choriogonadotropin (hCG) secretion by JEG-3 cells. Presently, JEG-3 cells are used in order to examine the effect of lipoxygenase products on hCG secretion. Results show that 30 μM 15-hydroxyeicosatetraenoic acid (15-HETE) induces an approximately 3-fold increase in basal hCG secretion, while 5-HETE, 12-HETE, and leukotriene LTA 4 have no significant effect. In addition, 15-HETE potentiates the stimulation of hCG secretion induced by 3 nM epidermal growth factor (EGF), but has no significant effect on the stimulation of hCG induced by 22 nM tetradecanoylphorbol acetate (TPA). The present study further implicates the arachidonic acid pathway in the control of hCG secretion and documents that the effect of EGF can be rate-limited by a product of the lipoxygenase system.
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