Selective Modulation of Excitatory and Inhibitory Microcircuits by Dopamine

Dopamine plays an important role in the working memory functions of the prefrontal cortex, functions that are impacted in age-related memory decline, drug abuse, and a wide variety of disorders, including schizophrenia and Parkinson's disease. We have previously reported that dopamine depresses...

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Bibliographic Details
Published in:Proceedings of the National Academy of Sciences - PNAS 2003-03, Vol.100 (5), p.2836-2841
Main Authors: Gao, Wen-Jun, Goldman-Rakic, Patricia S.
Format: Article
Language:English
Subjects:
Action potentials
Animals
Axons
Biological Sciences
Deoxyribonucleic acid
DNA
Dopamine - metabolism
Dopamine - pharmacology
Electrophysiology
Ferrets
Interneurons
Membrane potential
Neural Inhibition - drug effects
Neurons
Neurons - cytology
Neurons - metabolism
Neurons - pathology
Neurons - physiology
Neuroscience
Neurotransmitters
Prefrontal Cortex - physiology
Pyramidal cells
Pyramidal Cells - drug effects
Pyramidal Cells - physiology
Receptors
Synapses
Synapses - metabolism
Synapses - physiology
Synaptic transmission
Synaptic Transmission - drug effects
Synaptic Transmission - physiology
Time Factors
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Summary:Dopamine plays an important role in the working memory functions of the prefrontal cortex, functions that are impacted in age-related memory decline, drug abuse, and a wide variety of disorders, including schizophrenia and Parkinson's disease. We have previously reported that dopamine depresses excitatory transmission between pyramidal neurons in the prefrontal cortex. Here, using paired recordings, we have investigated dopaminergic modulation of excitatory transmission from pyramidal neurons to fast-spiking (FS) interneurons. In contrast to its effect on recurrent excitation, dopamine was without effect on excitatory transmission to FS interneurons. However, dopamine has directly enhanced the excitability of the FS interneurons to the extent that even a single excitatory postsynaptic potential could initiate spiking with great temporal precision in some of them. These results indicate that dopamine's effects on excitatory transmission are target-specific and that the axon terminals of pyramidal neurons can be selectively regulated at the level of individual synapses. Thus, dopamine's net inhibitory effect on cortical function is remarkably constrained by the nature of the microcircuit elements on which it acts.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.262796399