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- W2016309105 abstract "Y-box-binding protein 1 (YB-1) binds to mRNAs and affects translation. In this study, we focused on skeletal muscle, in which YB-1 expression is restricted to the early postnatal period, and found that YB-1 binds to acetylcholine receptor α-subunit (AChR α) mRNA. Although transcription of the AChR α gene is known to be regulated by myogenic transcription factors, translational control of the mRNA in response to neuromuscular transmission has not been examined. In undifferentiated C2C12 myoblasts, expression of AChR α remained at a low level. However, translation of the mRNA was increased by knockdown of YB-1. Continued overexpression of YB-1 prevented the cells from differentiating. In myotubes, which show clustering of AChRs, translation of the mRNA was induced within 3h after treatment with nicotine. The effect of nicotine was inhibited by α-bungarotoxin, and in the presence of cycloheximide the level of AChR α was reduced, even after nicotine treatment. Sucrose gradient analysis revealed that in nicotine-treated myotubes, YB-1-containing polysomes were shifted to the heavier-sedimenting fractions, and showed an apparent decrease in the amount of YB-1 bound to AChR α mRNA. These results suggest that in skeletal muscle cells, neural activity reduces the molar ratio of YB-1 relative to its binding AChR α mRNA, leading to an increase of ribosome binding to the mRNA, and thus activating translation. Furthermore, in postnatal growing mice, as has already been shown, the level of AChR α mRNA declined during the early period with maturation of neuromuscular synapses, but the translation level was found to increase transiently at postnatal day 10, when the level of YB-1 was markedly reduced. It is suggested that although the level of AChR α mRNA is reduced, the translation can be induced by alteration of the ratio of YB-1 protein to the mRNA." @default.
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- W2016309105 date "2011-11-01" @default.
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- W2016309105 title "Translational level of acetylcholine receptor α mRNA in mouse skeletal muscle is regulated by YB-1 in response to neural activity" @default.
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- W2016309105 doi "https://doi.org/10.1016/j.bbrc.2011.09.086" @default.
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