Abstract
The effects of chronic perinatal or postnatal administrations of diazepam on opiate receptor development in cerebral cortex and striatum were studied at two different post-treatment ages, using tritiated ehtylketocyclazocine, the prototypic κ-opiate, for measurements of opiate binding site ontogeny. Prenatal plus postnatal exposure to diazepam markedly decreased the total number of binding sites for [ 3H]ethylketocyclazocine in the rat cerebral cortex and striatum at 14 days of age. Postnatal diazepam treatment alone did not alter [ 3H]ethylketocyclazocine binding site development in cortex or striatum. These results suggest that development of opiate receptors in rat brain can be altered by prenatal exposure to diazepam.
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