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• W2003294508 abstract "Functional effects of prenatal cocaine exposure may be mediated in part by changes in catecholaminergic development. The present study examined whether cocaine administration influenced fetal brain activity of tyrosine hydroxylase (TH), the rate-limiting enzyme in catecholamine biosynthesis. Subcutaneous (s.c.) injection of pregnant rats with 40 mg/kg of cocaine HCl daily from gestational day (GD) 8 to GD20 resulted in an 8.7% stimulation of fetal whole-brain TH activity compared to controls. We then switched to a s.c. implantation procedure involving Silastic capsules filled with 80 mg of cocaine base dissolved in polyethylene glycol (PEG). Implantation of 2 such capsules on GD18 produced a 28% increase in fetal TH activity measured only 3 days later on GD21. Subsequent experiments demonstrated that GD14 implantation was equally effective in stimulating fetal TH activity on GD17, but that the enzyme was unaffected in the brains of the treated dams. When cocaine-containing capsules were implanted on GD18, removed on GD21, and the females were allowed to deliver normally, offspring TH activity was still elevated on postnatal day 10 but not later. Finally, the presence of cocaine implants from GD18 to GD21 had no influence on fetal brain neurotransmitter and metabolite concentrations, however, the treated dams exhibited significant reductions in dopamine (DA) and the serotonin metabolite, 5-hydroxyindoleacetic acid. We conclude that maternal cocaine implants rapidly but transiently stimulate TH activity in the fetal brain, and that such stimulation prevented the DA depletion observed in the dams." @default.
• W2003294508 created "2016-06-24" @default.
• W2003294508 creator A5022129555 @default.
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• W2003294508 date "1993-04-01" @default.
• W2003294508 modified "2023-09-23" @default.
• W2003294508 title "Prenatal cocaine administration stimulates fetal brain tyrosine hydroxylase activity" @default.
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• W2003294508 doi "https://doi.org/10.1016/0006-8993(93)90783-j" @default.
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