Differential contribution of storage pools to the extracellular amount of accumbal dopamine in high and low responders to novelty: effects of reserpine

• Published in: Journal of neurochemistry 2007-02, Vol.100 (3), p.810-821
• Main Authors: Verheij, M.M.M, Cools, A.R
• Format: Article
• Language: English
• Subjects: Acidosis - metabolism; Acidosis - physiopathology; Adrenergic Uptake Inhibitors - pharmacology; alpha-Methyltyrosine - pharmacology; Animals; Anticonvulsants. Antiepileptics. Antiparkinson agents; Behavior, Animal - drug effects; Behavior, Animal - physiology; Biological and medical sciences; Central nervous system; Central neurotransmission. Neuromudulation. Pathways and receptors; Cytoplasmic Vesicles - drug effects; Cytoplasmic Vesicles - metabolism; Dopamine - biosynthesis; dopamine pools; Enzyme Inhibitors - pharmacology; Exploratory Behavior - drug effects; Exploratory Behavior - physiology; Extracellular Fluid - drug effects; Extracellular Fluid - metabolism; Fundamental and applied biological sciences. Psychology; Habituation, Psychophysiologic - drug effects; Habituation, Psychophysiologic - physiology; individual differences; Male; Medical sciences; Microdialysis; Neuropharmacology; nucleus accumbens; Nucleus Accumbens - drug effects; Nucleus Accumbens - metabolism; Pharmacology. Drug treatments; Presynaptic Terminals - drug effects; Presynaptic Terminals - metabolism; Protons; Rats; Rats, Wistar; Reserpine - pharmacology; Reward; Substance-Related Disorders - metabolism; Substance-Related Disorders - physiopathology; Synaptic Transmission - drug effects; Synaptic Transmission - physiology; Vertebrates: nervous system and sense organs
• ISSN: 0022-3042; 1471-4159
• DOI: 10.1111/j.1471-4159.2006.04259.x

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.