Behavioral sensitization to psychomotor stimulants has been shown to be accompanied by a number of alterations in the mesoaccumbens dopamine (DA) system, including DA autoreceptor subsensitivity in the ventral tegmental area (VTA), postsynaptic D1 receptor supersensitivity in the nucleus accumbens (NAc), and augmentation of the DA-releasing effects of stimulants in the NAc. The present study ex...

This study examined glucocorticoid-adrenergic interactions in modulating acquisition and memory storage for inhibitory avoidance training. Systemically (s.c.) administered amphetamine (1 mg/kg), but not epinephrine (0.1 mg/kg) or the peripherally acting amphetamine derivative 4-OH amphetamine (2 mg/kg), given to rats shortly before training facilitated acquisition performance in a continuous mu...

The identification of isomeric drugs is gaining increasing importance in forensics and doping control. Isomers vary terms safety, effectiveness, regulation, particularly for amphetamine-related (ARDs). This study developed validated a pseudo-isocratic UPLC-qTOF-MS analytical method the Amphetamine-related (ARDs) blood following mixed-mode solid-phase extraction (MMSPE). procedure requires 250 ?...

The effects on food intake of repeated administration of d-amphetamine and fenfluramine were examined in rats adapted to a 4 hr/day feeding schedule. Control rats given daily injections of amphetamine before food access rapidly developed a partial tolerance to the food intake reducing effect of amphetamine. However, rats given a 6-hydroxydopamine (6-HDA) treatment which produced a large selecti...

Midkine (MK) is a cytokine that modulates amphetamine-induced striatal astrogliosis, suggesting a possible role of MK in neuroinflammation induced by amphetamine. To test this hypothesis, we studied astrogliosis and microglial response induced by amphetamine (10 mg/kg i.p. four times, every 2 h) in different brain areas of MK-/- mice and wild type (WT) mice. We found that amphetamine-induced mi...

We have shown recently that the psychomotor activating effects of amphetamine in the rat are much greater when this drug is administered in association with environmental novelty than when it is given in a home environment. The main purpose of the present study was to explore the neural basis of this phenomenon. We found, using in situ hybridization of c-fos mRNA, that the pattern of neuronal a...

Previous work has shown that individual differences in locomotor activity in an inescapable novel environment can predict acquisition of amphetamine self-administration. The current study examined whether individual differences in approach to novelty in a free choice test could also predict amphetamine self-administration. Further, the current study examined whether individual differences in ei...

in the current study, the effects of ethanol (etoh) on toxicokinetics of methamphetamine (ma) and its metabolite amphetamine (ap) were investigated. a single dose of ma hydrochloride at 15 mg/kg was given intragastrically, either alone (ma group; n = 8) or in conjunction with 3 g/kg etoh (ma+etoh group; n = 8) to rabbits. in placebo group, normal saline only was given (placebo group; n = 4). pl...

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The repeated administration of amphetamine in rats produces behavioral sensitization which is characterized either by a progressive enhancement of the locomotor activity induced by the drug or by an enduring behavioral hypersensitivity to the drug after the cessation of the treatment. Some authors have suggested that the action of amphetamine at the level of the nucleus accumbens is responsible...