Abstract
The present study examined the effects of early postnatal treatment with a beta-adrenoceptor antagonist propranolol (5 mg/kg IP daily) on concomitant and subsequent behavior and central aminergic transmission in rats. During propranolol exposure from the 7th to the 20th postnatal days sleep-wake recordings, carried out with the static charge sensitive bed (SCSB) method, showed a decrease in the percentage of active sleep and an increase in waking. When the animals were 1–3 months of age, the open field behavior was changed, immobility time in the Porsolt's swim test was lengthened, and voluntary alcohol consumption was increased in the propranolol-treated rats. Neither motor reactivity to auditory stimuli nor spontaneous alternation behavior was affected. At the age of 4 months concentrations of brain amines and their metabolites were measured from several brain regions. In the propranolol-treated rats the noradrenaline levels were increased in the limbic forebrain and cerebellum. The results suggest that in rats the exposure to propranolol during the rapid growth period of cerebral catecholamine systems, and the concomitant alterations in sleep are related to later changes in behavior and to increased noradrenaline content in the limbic forebrain and cerebellum.
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Hilakivi, L.A., Taira, T., Hilakivi, I. et al. Early postnatal treatment with propranolol affects development of brain amines and behavior. Psychopharmacology 96, 353–359 (1988). https://doi.org/10.1007/BF00216061
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DOI: https://doi.org/10.1007/BF00216061