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- W1990288001 abstract "Previous studies have demonstrated that, in rat, individual sympathetic neurons can express both adrenergic and cholinergic biosynthetic enzymes in culture. Moreover, the levels of these enzymes can be regulated by factors present in their environment. In the present study, we sought to determine whether cultures of chick sympathetic neurons express both adrenergic and cholinergic enzymes, whether both enzymes are expressed in the same neurons, and whether the levels of these enzymes can be influenced by environmental factors. In our system, we tested one such factor found in embryonic eye extract (EEE) which has been shown to specifically increase the activity of the cholinergic enzyme choline acetyltransferase (ChAT) in cultures of chick parasympathetic neurons Varon et al., Brain Res., 173 (1979) 29-45; Nishi and Berg. J. Neurosci., 1 (1981) 505-513). At various times in vitro, cultures were analyzed using biochemical, immunocytochemical and autoradiographic techniques. We found that only those cultures of sympathetic neurons supplemented with EEE developed detectable levels of ChAT enzyme activity at 2 days, which increased significantly by 14 days in vitro. Supplementation with EEE did not affect the level of tyrosine hydroxylase (TH) activity. Furthermore, irrespective of nutrient medium, all neurons in all cultures contained TH immunoreactivity and possessed a high-affinity amine uptake system as demonstrated by autoradiography. These studies suggest that neurons of chick sympathetic ganglia can be influenced by factors present in EEE to express a cholinergic enzyme and that this enzyme is coexpressed by cells also exhibiting an adrenergic phenotype." @default.
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- W1990288001 date "1987-05-01" @default.
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- W1990288001 title "Chick eye extract promotes expression of a cholinergic enzyme in sympathetic ganglia in culture" @default.
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- W1990288001 doi "https://doi.org/10.1016/0165-3806(87)90176-3" @default.
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