Differential contribution of storage pools to the extracellular amount of accumbal dopamine in high and low responders to novelty: effects of reserpine.
The present study examined the effects of reserpine on the extracellular concentration of accumbal dopamine in high responders (HR) and low responders (LR) to novelty rats. Reserpine reduced the baseline concentration of extracellular accumbal dopamine more in HR than in LR, indicating that the dopamine release is more dependent on reserpine-sensitive storage vesicles in non-challenged HR than in non-challenged LR. In addition, reserpine reduced the novelty-induced increase of the extracellular concentration of accumbal dopamine in LR, but not in HR, indicating that the dopamine release in response to novelty depends on reserpine-sensitive storage vesicles only in LR, not in HR. Our data clearly demonstrate that HR and LR differ in the characteristics of those monoaminergic storage vesicles that mediate accumbal dopamine release.
Verheij
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MM
Department of Psychoneuropharmacology, Nijmegen Institute for Neurosciences, Faculty of Medicine, Radboud University of Nijmegen, Nijmegen, The Netherlands. M.Verheij@pnf.umcn.nl
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D000138:Acidosis / Q000378:metabolism / Q000503:physiopathology; D018759:Adrenergic Uptake Inhibitors / Q000494:pharmacology; D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects / Q000502:physiology; D022162:Cytoplasmic Vesicles / Q000187:drug effects* / Q000378:metabolism; D004298:Dopamine / Q000096:biosynthesis*; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005106:Exploratory Behavior / Q000187:drug effects / Q000502:physiology; D045604:Extracellular Fluid / Q000187:drug effects* / Q000378:metabolism; D006185:Habituation, Psychophysiologic / Q000187:drug effects / Q000502:physiology; D008297:Male; D017551:Microdialysis; D009714:Nucleus Accumbens / Q000187:drug effects* / Q000378:metabolism; D017729:Presynaptic Terminals / Q000187:drug effects* / Q000378:metabolism; D011522:Protons; D051381:Rats; D017208:Rats, Wistar; D012110:Reserpine / Q000494:pharmacology*; D012201:Reward; D019966:Substance-Related Disorders / Q000378:metabolism / Q000503:physiopathology; D009435:Synaptic Transmission / Q000187:drug effects / Q000502:physiology; D019805:alpha-Methyltyrosine / Q000494:pharmacology
D018759:Adrenergic Uptake Inhibitors; D004791:Enzyme Inhibitors; D011522:Protons; D019805:alpha-Methyltyrosine; D012110:Reserpine; D004298:Dopamine