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• W2041275098 abstract "The effects of low (0.5 mg/kg) and high (2.0 mg/kg) doses of bromocriptine (BCR) on activity and escape performance were examined during the first month of postnatal life in normal developing rat pups and littermates treated at 5 days of age with a combination of desmethylimipramine and 6-hydroxydopamine (6-OHDA). Such a procedure resulted in significant reductions in brain dopamine to concentrations 10-20% of vehicle controls while norepinephrine was unaffected. BCR increased general motor activity in vehicle pups at 13 and 19 days but had little effect on more mature animals. Pups who had not received BCR exhibited a decline in activity over the hour long observation period (habituation of activity) but this decline was abolished by both low (0.5 mg/kg) and high (2.0 mg/kg) doses of the agent. Stereotyped activity, particularly at 19 days was increased by BCR in 6-OHDA pups but not in vehicle animals, an effect suggesting denervation supersensitivity. Head dips in a hole box at 30 days of age were not influenced by BCR in vehicle pups but significantly reduced by BCR in 6-OHDA pups, suggesting that BCR might be acting to stimulate inhibitory dopaminergic mechanisms. Escape learning in a T-maze at 20 days and shuttle box at 28 days was disrupted by high doses of BCR in vehicle pups and both doses of BCR in 6-OHDA animals. The similarity with the behaviors observed in the clinical syndrome of attention deficit disorder with hyperactivity prompted a number of investigative groups including our own to suggest that the 6-OHDA model might serve as a useful and convenient paradigm to evaluate pharmacological agents that offer potential in the treatment of this most common disorder. From this perspective we would predict that BCR would have little clinical utility since it both failed to attenuate 6-OHDA induced hyperactivity and tended to disrupt performance in an avoidance learning task." @default.
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• W2041275098 date "1981-09-01" @default.
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• W2041275098 title "Effects of bromocriptine in developing rat pups after 6-hydroxydopamine" @default.
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• W2041275098 doi "https://doi.org/10.1016/0091-3057(81)90275-6" @default.
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