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The 5-HT(5A) receptor is the least understood serotonin (5-HT) receptor. Here, we electrophysiologically identify and characterize a native 5-HT(5A) receptor current in acute ex vivo brain slices of adult rodent prefrontal cortex. In the presence of antagonists for the previously characterized 5-HT(1A) and 5-HT₂ receptors, a proportion of layer V pyramidal neurons continue to show 5-HT-elicited outward currents in both rats and mice. These 5-HT currents are suppressed by the selective 5-HT(5A) antagonist, SB-699551, and are not observed in 5-HT(5A) receptor knock-out mice. Further characterization reveals that the 5-HT(5A) current is activated by submicromolar concentrations of 5-HT, is inwardly rectifying with a reversal potential near the equilibrium potential for K+ ions, and is suppressed by blockers of Kir3 channels. Finally, we observe that genetic deletion of the inhibitory 5-HT(5A) receptor results in an unexpected, large increase in the inhibitory 5-HT(1A) receptor currents. The presence of functional prefrontal 5-HT(5A) receptors in normal rodents along with compensatory plasticity in 5-HT(5A) receptor knock-out mice testifies to the significance of this receptor in the healthy prefrontal cortex.

journal of neuroscience

The Native Serotonin 5-HT<sub>5A</sub>Receptor: Electrophysiological Characterization in Rodent Cortex and 5-HT<sub>1A</sub>-Mediated Compensatory Plasticity in the Knock-Out Mouse

The Native Serotonin 5-HT5AReceptor: Electrophysiological Characterization in Rodent Cortex and 5-HT1A-Mediated Compensatory Plasticity in the Knock-Out Mouse

The Native Serotonin 5-HT_5AReceptor: Electrophysiological Characterization in Rodent Cortex and 5-HT_1A-Mediated Compensatory Plasticity in the Knock-Out Mouse