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- W1973909216 abstract "The acetylcholine receptor alpha5 and alpha7 subunits are components of different nicotinic receptor subtypes expressed in the nervous system. However, they are also present in non-neuronal tissues. We have detected alpha5 and alpha7 transcripts in mouse C2C12 muscle cells. Moreover, on differentiation of myoblasts into myotubes, the amount of alpha7 transcripts increased significantly, whereas alpha5 remained unchanged. In order to explore how the expression of these neuronal genes is regulated in muscle, we have characterized their promoter activities. Deletion and mutagenesis analysis with transfected reporter genes showed that transcriptional activity was controlled by regulatory elements also operative in neuronal-like cells. Thus, the activity of the alpha5 subunit core promoter decreased to approximately 50% on alteration of one, two, or three of the five Sp1 binding sites present in this region and was almost abolished when four or five sites were mutated simultaneously. In the case of the alpha7 subunit promoter, the upstream stimulatory factor and the early growth response gene transcription factor were involved in regulating its transcriptional activity. In addition, the alpha7 promoter was activated during the differentiation process, in a mechanism partially dependent on the mentioned factors." @default.
- W1973909216 created "2016-06-24" @default.
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- W1973909216 date "2001-10-01" @default.
- W1973909216 modified "2023-09-26" @default.
- W1973909216 title "Activity of the Nicotinic Acetylcholine Receptor<i>α</i>5 and<i>α</i>7 Subunit Promoters in Muscle Cells" @default.
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- W1973909216 doi "https://doi.org/10.1089/104454901753340640" @default.
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