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- W2016134726 abstract "Culture conditions have been established for growing neurons from the medial frontal part of the forebrain, containing the septum and the diagonal band of Broca, of 17-day-old rat embryos in a chemically defined medium. At 10 days in vitro, the cultures contained more than 96% nerve cells of which about 18% were cholinergic neurons, while the proportion of astrocytes was less than 1%. The majority of the cells that stained for acetylcholinesterase were bipolar but with different sizes and shapes. During development both the specific activity of choline acetyltransferase (ChAT) and the amount of protein increased markedly in the cholinergic cultures, ChAT activity rising much more than the protein content. Exposure of the cultures to nerve growth factor (NGF) or 3,3′,5-triiodo-l-thyronine (T3) enhanced the expression of ChAT activity in a dose-dependent manner. The elevation of ChAT activity was due to an increase in the amount of enzyme per cholinergic cell, since, during the experimental period studied, neither treatment with NGF nor with T3 had significant effects on the total protein content of the cultures or on the number of cells, including the cholinergic neurons. When cultures were supplemented with both agents at maximal effective concentrations, the stimulation in ChAT activity was much greater than the sum of the individual effects. The observations indicate that subcortical cholinergic neurons, which are affected in Alzheimer's disease and in Down's syndrome, are subject to regulation by an interaction between thyroid hormone and local humoral factors such as NGF." @default.
- W2016134726 created "2016-06-24" @default.
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- W2016134726 date "1987-11-01" @default.
- W2016134726 modified "2023-10-18" @default.
- W2016134726 title "An interaction between thyroid hormone and nerve growth factor in the regulation of choline acetyltransferase activity in neuronal cultures, derived from the septal-diagonal band region of the embryonic rat brain" @default.
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- W2016134726 doi "https://doi.org/10.1016/0165-3806(87)90069-1" @default.
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