Abstract
Rationale
It has been proposed that dopamine (DA) sustains up states in striatal medium spiny neurons (MSN). Testing this hypothesis requires an in vitro preparation, but up states are typically only observed in vivo.
Objectives
In this study, we used corticostriatal organotypic cocultures, a preparation in which up states have been previously observed, to test the DA control of cortically-driven plateau depolarizations.
Results
After 7–21 days in vitro in serum-free conditions, plateau depolarizations resembling up states were only observed in cultures with a critical extent of striatal DA innervation. These plateaus were completely blocked by the non-NMDA antagonist CNQX and significantly shortened by the NMDA antagonist APV or the D1 antagonist SCH23390. Intracellular interruption of Ca++ or protein-kinase A (PKA) signaling also eliminated the plateaus. The D2 antagonist eticlopride failed to disrupt the plateaus, but significantly increased MSN excitability.
Conclusions
These results suggest that coincident activation of corticostriatal glutamatergic and mesostriatal DA transmission may set ensembles of MSN into prolonged depolarizations through a D1 enhancement of striatal NMDA function in a Ca++ and PKA-dependent manner.
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Acknowledgements
We thank Mr. Gregory Lyng for preparing some of the organotypic cocultures used in the present study. This research was supported by the Tourette Syndrome Association (ASK), USPHS grants MH57683 (PO’D), MH60131 (PO’D) and a NARSAD Independent Investigator Award (PO’D).
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Tseng, K.Y., Snyder-Keller, A. & O’Donnell, P. Dopaminergic modulation of striatal plateau depolarizations in corticostriatal organotypic cocultures. Psychopharmacology 191, 627–640 (2007). https://doi.org/10.1007/s00213-006-0439-7
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DOI: https://doi.org/10.1007/s00213-006-0439-7