Journal of neurochemistry
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Journal of neurochemistry · Feb 2019
The blocking of kappa-opioid receptor reverses the changes in dorsolateral striatum dopamine dynamics during the amphetamine sensitization.
Kappa-opioid receptors (KOR) control dopamine (DA) levels in the striatum and contribute significantly to the progression of drug addiction. Repeated exposure to psychostimulants has been associated with up-regulated KOR activity and increased DA levels in dorsal striatum. However, it has not been tested if both processes are linked. ⋯ Conversely, the expression of AMPH sensitization was accompanied by a significant increase in DA Cext associated with an increased basal DA dialysate and an attenuation in DA uptake. Both local and systemic administration of nor-binaltorphimine reversed changes in DLS after AMPH pre-treatment. These findings indicate that endogenous KOR system tunes DLS DA dynamics during the progression to AMPH sensitization.