Cerebral Cortex, Vol. 11, No. 5, 452-462,
May 2001
© 2001 Oxford University Press
D1 Dopamine Receptors Potentiate NMDA-mediated Excitability Increase in Layer V Prefrontal Cortical Pyramidal Neurons
Center for Neuropharmacology & Neuroscience, Albany Medical College, Albany, NY 12208, USA
The interactions between N-methyl-D-aspartate (NMDA) and D1 dopamine receptors in the rat prefrontal cortex were examined using whole-cell recordings from pyramidal neurons. The effects of NMDA, the D1 agonist SKF38393, or both compounds combined were tested on measures of cell excitability. Both NMDA (10–100 µM) and SKF38393 (5–10 µM) independently increased the number of spikes and decreased the latency of the first spike evoked by intracellular depolarizing current pulses. Combining low doses of NMDA (5 µM) and SKF38393 (2 µM) resulted in a marked increase of cell excitability. This synergism was blocked by SCH23390, protein kinase A (PKA) inhibitors, and the Ca2+ chelator BAPTA, and reduced by nifedipine. These results indicate the presence of a dopamine– glutamate interaction in the prefrontal cortex at the postsynaptic level, by which D1 dopamine receptors may maintain NMDA- mediated responses in prefrontal cortical pyramidal neurons through both a PKA-dependent pathway and Ca2+-dependent mechanisms.
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