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• W2026899993 abstract "—Cell nuclei were isolated from four regions of the brains of ovariectomized female rats 2 hr after the injection of [3H]oestradiol. By light microscopy, the nuclear pellets contained highly purified nuclei of neuronal and glial cells with little cytoplasmic contamination. Tritium was concentrated in cell nuclei from the preoptic-hypothalamic area, to a lesser extent in nuclei from the amygdaloid region and hippocampus, and least of all in cerebral cortical nuclei. In comparison with whole homogenates (= 1-0), the nuclear concentrations of radioactivity were 12·9, 4·7, 1·9 and 0·8, respectively. Approximately 40 per cent of the radioactivity in homogenates of the preoptic-hypothalamic area was present in cell nuclei, and upon TLC more than 85 per cent of the radioactive material in the nuclei exhibited the RF of oestradiol-17β. Pretreatment of ovariectomized females with 1 mg of unlabelled oestradiol 30 min before the injection of labelled hormone abolished the nuclear uptake of [3H]oestradiol in all four regions of the brain. A concurrent injection of 10 μg of unlabelled oestradiol-17β significantly reduced nuclear uptake, while a similar injection of testosterone or oestradiol-17α had no significant effect. One mg of oestradiol-17α, but not testosterone, did reduce nuclear uptake. The retention of [3H]oestradiol by the preoptic-hypothalamic area decreased exponentially in the tissue from 30 min to 4 h after an intraperitoneal injection; however, nuclear binding reached a peak at 1-2 h and still showed high retention at 4 h. These results, together with observations in other laboratories of morphological changes induced by oestrogens, establish that certain regions of the brain are bona fide targets for the action of oestradiol." @default.
• W2026899993 created "2016-06-24" @default.
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• W2026899993 date "1970-07-01" @default.
• W2026899993 modified "2023-09-27" @default.
• W2026899993 title "SELECTIVE RETENTION OF OESTRADIOL BY CELL NUCLEI IN SPECIFIC BRAIN REGIONS OF THE OVARIECTOMIZED RAT" @default.
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• W2026899993 doi "https://doi.org/10.1111/j.1471-4159.1970.tb02242.x" @default.
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