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- W1994204090 abstract "Abstract: Dopamine released from brain nerve terminals is mainly removed from the synaptic cleft by an uptake mechanism. Despite their functional importance, modulation of the dopamine uptake sites is still not well known. Steroid hormones were shown to modulate brain dopamine transmission. The aim of this study was thus to investigate in ovariectomized rats the effects of 17β-estradiol and progesterone treatments on brain dopamine uptake sites. Treatments consisted of 17β-estradiol (10 μg/0.2 ml), progesterone (0.72 mg/0.2 ml). 17β-estradiol + progesterone, or the vehicle (0.3% gelatin in saline solution) twice daily for 2 weeks. The steroid treatments left the affinity of [3H]GBR 12935 binding to striatal homogenates unchanged (ovariectomized rats, 0.823 ± 0.028 nM), whereas the density was increased by these steroids alone or in combination to a similar extent of 16-23%. Chronic treatment of ovariectomized rats with 17β-estradiol progesterone, or their combination increased to the same extent and uniformly [3H]-GBR 12935 binding in the striatum as measured by autoradiography; the increase was similar in the substantia nigra pars compacta, whereas no steroid effect was observed in the nucleus accumbens and in the substantia nigra pars reticulata. In summary, chronic exposure to 17β-estradiol and/ or progesterone increased dopamine uptake site density in the nigrostriatal dopaminergic system, whereas the nucleus accumbens and the substantia nigra pars reticulata were unaffected." @default.
- W1994204090 created "2016-06-24" @default.
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- W1994204090 date "1993-05-01" @default.
- W1994204090 modified "2023-09-23" @default.
- W1994204090 title "Effect of Chronic Estradiol and Progesterone Treatments of Ovariectomized Rats on Brain Dopamine Uptake Sites" @default.
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- W1994204090 doi "https://doi.org/10.1111/j.1471-4159.1993.tb13415.x" @default.
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