Abstract
Working memory is regulated by neurotransmitters in prefrontal cortex (PFC), including dopamine and norepinephrine. Previous studies of dopamine function in working memory have focused on the D1 and D2 receptors, with most evidence suggesting a dominant role for the D1 receptor. Since the dopamine D4 receptor is highly expressed in PFC, we hypothesize that it may also contribute to working memory. To test this hypothesis, we examined behavioral effects of L-745,870, a highly selective, centrally active, D4 antagonist, using a delayed alternation task in rats. Task performance was dose-dependently affected by the D4 antagonist, depending on individual baseline functional status of working memory. In rats with good baseline performance, the D4 antagonist had no effects at low doses, whereas high doses disrupted working memory. In rats with poor baseline working memory, the D4 antagonist significantly improved working memory at low doses, and higher doses were not distinguishable from vehicle controls. Effects of the D4 antagonist among poor performers were most robust when task demand for working memory was high, with lesser effects at lower demand level, suggesting that such effects were selective for working memory. The present findings indicate a significant role of the D4 receptor in working memory, and suggest innovative, D4-based, treatment of cognitive deficits associated with neuropsychiatric disorders.
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Acknowledgements
This work was supported, in part, by a grant from the Bruce J Anderson Foundation and by the McLean Private Donors Neuropsychopharmacology Research Fund (to RJB). L-745,870 was generously donated by Merck (Rahway, NJ).
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Zhang, K., Grady, C., Tsapakis, E. et al. Regulation of Working Memory by Dopamine D4 Receptor in Rats. Neuropsychopharmacol 29, 1648–1655 (2004). https://doi.org/10.1038/sj.npp.1300491
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DOI: https://doi.org/10.1038/sj.npp.1300491
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