Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 100, Issue 5, Pages 2836-2841Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.262796399
Keywords
pyramidal neuron; interneuron; excitatory transmission; in vitro
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Funding
- NIMH NIH HHS [MH44866, MH38546, R01 MH038546, R37 MH038546, R01 MH085666] Funding Source: Medline
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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.
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