Abstract
Serum cholinesterase, hepatic histidase and monoamine oxidase activity levels are higher in adult female rats than in adult male rats. Exposure of neonatal rats to antioestrogen (tamoxifen or CI-628) resulted in increased serum cholinesterase in adult females only and no effect on hepatic histidase and monoamine oxidase in both sexes. Neonatal tamoxifen or CI-628 treatment resulted in reduced body weights in adult male rats and reduced uterine wet weights in adult female rats. Circulating oestrogen levels measured in adult female rats treated neonatally with tamoxifen were not significantly different from controls. Specific oestrogen uptake in the brain of adult male and female rats was found to be higher in the pituitary than in the preoptic-anterior hypothalamic area and the median eminence-basal hypothalamus than in the cerebral cortex. There was higher uptake of [ 3H]oestradiol-17β in male pituitaries than in female pituitaries. No other sex-difference was observed. Neonatal tamoxifen treatment did not alter the capacity of these brain tissues to take up oestrogen. It is suggested that neonatal antioestrogen exposure has altered the endocrine expression of serum cholinesterase in adult female rats by interfering with normal imprinting mechanisms.
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