Dopamine D4 receptor-deficient mice display cortical hyperexcitability

Marcelo Rubinstein, Carlos Cepeda, Raymond S. Hurst, Jorge Flores-Hernandez, Marjorie A. Ariano, Tomás L. Falzone, Laura B. Kozell, Charles K. Meshul, James R. Bunzow, Malcolm J. Low, Michael S. Levine, David K. Grandy

    Research output: Contribution to journalArticle

    114 Scopus citations

    Abstract

    The dopamine D4 receptor (D4R) is predominantly expressed in the frontal cortex (FC), a brain region that receives dense input from midbrain dopamine (DA) neurons and is associated with cognitive and emotional processes. However, the physiological significance of this dopamine receptor subtype has been difficult to explore because of the slow development of D4R agonists and antagonists the selectivity and efficacy of which have been rigorously demonstrated in vivo. We have attempted to overcome this limitation by taking a multidimensional approach to the characterization of mice completely deficient in this receptor subtype. Electrophysiological current and clamp recordings were performed in cortical pyramidal neurons voltage-from wild-type and D4R-deficient mice. The frequency of spontaneous synaptic activity and the frequency and duration of paroxysmal discharges induced by epileptogenic agents were increased in mutant mice. Enhanced synaptic activity was also observed in brain slices of wild-type mice incubated in the presence of the selective D4R antagonist PNU-101387G. Consistent with greater electrophysiological activity, nerve terminal glutamate density associated with asymmetrical synaptic contacts within layer VI of the motor cortex was reduced in mutant neurons. Taken together, these results suggest that the D4R can function as an inhibitory modulator of glutamate activity in the FC.

    Original languageEnglish (US)
    Pages (from-to)3756-3763
    Number of pages8
    JournalJournal of Neuroscience
    Volume21
    Issue number11
    StatePublished - Jun 1 2001

    Keywords

    • Attention deficit hyperactivity disorder
    • D receptor
    • Dopamine
    • Epilepsy
    • Frontal cortex
    • Glutamate

    ASJC Scopus subject areas

    • Neuroscience(all)

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  • Cite this

    Rubinstein, M., Cepeda, C., Hurst, R. S., Flores-Hernandez, J., Ariano, M. A., Falzone, T. L., Kozell, L. B., Meshul, C. K., Bunzow, J. R., Low, M. J., Levine, M. S., & Grandy, D. K. (2001). Dopamine D4 receptor-deficient mice display cortical hyperexcitability. Journal of Neuroscience, 21(11), 3756-3763.