Effects of d-amphetamine and methylphenidate on hyperactivity produced by neonatal 6-hydroxydopamine treatment - PubMed (original) (raw)

Effects of d-amphetamine and methylphenidate on hyperactivity produced by neonatal 6-hydroxydopamine treatment

J Luthman et al. Psychopharmacology (Berl). 1989.

Abstract

Neonatal intracisternal administration of 6-hydroxydopamine (6-OHDA, 50 micrograms on day 1 after birth) caused a marked hyperactivity when the rats were tested as adults. These rats also showed severe DA depletions in striatum and nucleus accumbens. Pretreatment with the noradrenaline (NA) uptake inhibitor desipramine provided protection against NA depletion in frontal cortex and nucleus accumbens. Pretreatment with DA uptake inhibitors, amfolenic acid or GBR 12909, before 6-OHDA, provided full protection against DA depletion but produced marked NA depletion in frontal cortex. These rats did not demonstrate any degree of hyperactivity. Low doses of d-amphetamine (0.25 mg/kg SC) or methylphenidate (1 mg/kg SC) reversed the hyperactivity in DA-depleted rats but increased motor activity in vehicle-treated and NA-depleted rats. Higher doses of d-amphetamine (1 mg/kg) or methylphenidate (4 mg/kg) produced potentiated levels of locomotion but attenuated levels of rearing in DA-depleted animals. The results further suggest the utility of the neonatal DA lesion in rats as a potential animal model for derivation of therapeutic agents that may be efficacious in the treatment of the hyperkinetic syndrome.

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