Abstract
Rationale
Extracellular signal-regulated kinase (ERK), cAMP response element binding protein (CREB), and protein kinase B (PKB or Akt) in the striatum are differentially activated by acute and repeated amphetamine (AMPH) administration. However, the dopamine receptor subtypes that mediate transient vs. prolonged phosphorylation changes in these proteins induced by AMPH challenge in AMPH-sensitized rats are unknown.
Objectives
The role of the D1 and D2 class of dopamine receptors in the differential phosphorylation of striatal ERK, CREB, Thr308-Akt and Ser473-Akt and the expression of behavioral sensitization induced by AMPH challenge in AMPH-pretreated rats were determined.
Methods
D1 or D2 dopamine receptor antagonists were injected before an AMPH challenge in AMPH-sensitized rats. After behavioral activity was recorded, rats were euthanized either 15 min or 2 h after AMPH challenge and striatal phosphoprotein status was analyzed by Western blotting.
Results
The D1 receptor antagonist (SCH23390) decreased stereotypical behavior whereas the D2 receptor antagonist (eticlopride) decreased all behavioral activity induced by an AMPH challenge in AMPH-sensitized rats. SCH23390, but not eticlopride, significantly decreased ERK, CREB, and Thr308-Akt phosphorylation in the striatum 15 min, and ERK and CREB phosphorylation 2 h, after AMPH challenge in AMPH-sensitized rats. In contrast, eticlopride, but not SCH23390, prevented a decrease in Akt phosphorylation 2 h after AMPH challenge.
Conclusions
These data indicate that the time course of phosphoprotein signaling is differentially regulated by D1 and D2 receptors in the striatum of AMPH-sensitized rats, suggesting that complex regulatory interactions are activated by repeated AMPH exposure.
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Supported by NIH RO1 DA03982 and CO6 RR015455
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Shi, X., McGinty, J.F. D1 and D2 dopamine receptors differentially mediate the activation of phosphoproteins in the striatum of amphetamine-sensitized rats. Psychopharmacology 214, 653–663 (2011). https://doi.org/10.1007/s00213-010-2068-4
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DOI: https://doi.org/10.1007/s00213-010-2068-4