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Pretreatment of cerebral synaptic membranes with arachidonic acid (10 nM-1 microM) at 37 degrees C for 40 min caused a significant increase in [3H]clonidine binding but pretreatment at 4 degrees C did not. Scatchard analysis showed that 100 nM arachidonic acid pretreatment resulted in a significant elevation of the Bmax value of the low affinity site. PGD2, PGE2 and PGF2 alpha (10-100 microM) pretreatment also enhanced binding. These polyunsaturated fatty acids could be involved in regulation of the alpha 2-adrenoceptor binding in rat cerebral cortical membranes.

Enhancement of [3H]Clonidine Binding to Rat Cerebral Synaptic Membranes by Treatment with Arachidonic Acid, Prostaglandin (PG) D2, PGE2 and PGF2