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The Journal of Neurophysiology Vol. 82 No. 6 December 1999, pp. 2989-2999
Copyright ©1999 by the American Physiological Society
Department of Neurobiology, University of Alabama, Birmingham, Alabama 35294
Zhou, Fu-Ming and
John J. Hablitz.
Activation of Serotonin Receptors Modulates Synaptic Transmission
in Rat Cerebral Cortex. J. Neurophysiol. 82: 2989-2999, 1999. The cerebral cortex receives an
extensive serotonergic (5-hydroxytryptamine, 5-HT) input.
Immunohistochemical studies suggest that inhibitory neurons are the
main target of 5-HT innervation. In vivo extracellular recordings have
shown that 5-HT generally inhibited cortical pyramidal neurons, whereas
in vitro studies have shown an excitatory action. To determine the
cellular mechanisms underlying the diverse actions of 5-HT in the
cortex, we examined its effects on cortical inhibitory interneurons and
pyramidal neurons. We found that 5-HT, through activation of
5-HT2A receptors, induced a massive enhancement of
spontaneous inhibitory postsynaptic currents (sIPSCs) in pyramidal
neurons, lasting for ~6 min. In interneurons, this 5-HT-induced
enhancement of sIPSCs was much weaker. Activation of 5-HT2A
receptors also increased spontaneous excitatory postsynaptic currents
(sEPSCs) in pyramidal neurons. This response desensitized less and at a
slower rate. In contrast, 5-HT slightly decreased evoked IPSCs (eIPSCs)
and eEPSCs. In addition, 5-HT via 5-HT3 receptors evoked a
large and rapidly desensitizing inward current in a subset of
interneurons and induced a transient enhancement of sIPSCs. Our results
suggest that 5-HT has widespread effects on both interneurons and
pyramidal neurons and that a short pulse of 5-HT is likely to induce
inhibition whereas the prolonged presence of 5-HT may result in excitation.
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