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Hamamura, T; Fibiger, H C
European journal of pharmacology, 06/1993, Letnik: 237, Številka: 1Journal Article
This study examined the extent to which chronic d-amphetamine administration sensitizes animals to some behavioral and neurochemical effects of foot shock stress. Rats received daily injections of saline for 14 days or d-amphetamine (2 mg/kg 7 days and 4 mg/kg 7 days). After a 7 day drug abstinent period, extracellular dopamine, 3,4-dihydroxyphenylacetic acid and homovanillic acid concentrations were measured in the medial prefrontal cortex using in vivo microdialysis in freely moving rats. The behavioral responses to mild foot shock stress were enhanced in the d-amphetamine-pretreated subjects. Concomitant with this behavioral sensitization, d-amphetamine-pretreated subjects showed greater stress-induced increases in extracellular dopamine in the medial prefrontal cortex than in controls. d-Amphetamine (2 mg/kg)-induced stereotyped behavior was also enhanced in the amphetamine-pretreated animals compared to controls; however, d-amphetamine-induced increases in extracellular dopamine in the medial prefrontal cortex were not enhanced in the amphetamine-pretreated group. These results suggest that the mesocortical dopaminergic system is involved in cross-sensitization between d-amphetamine and stress, but not in d-amphetamine-induced behavioral sensitization.
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Leto | Faktor vpliva | Izdaja | Kategorija | Razvrstitev | ||||
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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Vir: Osebne bibliografije
in: SICRIS
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