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Repeated administration of direct-acting (apomorphine, SKF-38393, quinpirole) or indirect-acting (amphetamine, cocaine) dopaminergic agonists can produce enhancement of locomotor and sterotypic behaviours in response to subsequent dopamine agonist challenge. This sensitization of dopamine receptors, known as priming or reverse tolerance, is long-lasting and appears to be dependent upon the participation...
Manipulations of D1- or D2-dopamine receptors have differential and selective effects on the striatonigral and striatopallidal output pathways of the striatum, respectively. However, combined stimulation of these receptors produces synergistic responses. To examine the locus of this interactionin vivo, we infused D1- or D2-receptor agents into the striatum of freely moving, dopamine-depleted rats...
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