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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

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.

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.[1]

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