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Serotonin (5-HT) stimulated the release of arachidonic acid in hippocampal neurons cocultured with glial cells but not in glial cultures alone. Similar results were observed for the 5-HT-stimulated release of inositol phosphates. These results suggest a neural but not glial origin of both responses. Pharmacological studies suggested that release of arachidonic acid and inositol phosphates was mediated by a type 2 5-HT (5-HT2) receptor. 5-HT-stimulated release of arachidonic acid was also detected in cortical neurons, which contain high levels of 5-HT2 receptors, but not striatum, spinal cord, or cerebellar granule cells, which have very low levels or are devoid of 5-HT2 receptors. The phorbol ester phorbol 12-myristate 13-acetate augmented the 5-HT-stimulated release of arachidonic acid but inhibited the 5-HT-stimulated release of inositol phosphates. 5-HT-stimulated release of arachidonic acid, but not inositol phosphates, was dependent on extracellular calcium. 5-HT stimulated the release of [3H]lysophosphatidylcholine from [3H]choline-labeled cells with no increase in the release of [3H]choline or phospho[3H]choline. These data suggest that 5-HT stimulated the release of arachidonic acid in hippocampal neurons through the activation of phospholipase A2, independent of the activation of phospholipase C.

proceedings of the national academy of sciences of the united states of america

Serotonin stimulates phospholipase A2 and the release of arachidonic acid in hippocampal neurons by a type 2 serotonin receptor that is independent of inositolphospholipid hydrolysis.