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• W2101717459 endingPage "10791" @default.
• W2101717459 startingPage "10777" @default.
• W2101717459 abstract "In adult skeletal muscle, beta myosin heavy chain (betaMyHC) gene expression is primarily restricted to slow type I fibers; however, its expression is down-regulated in response to muscle inactivity. Little is known about the signaling pathways and transcription factors that mediate this important functional response. This study demonstrates that increased binding of Sp3 to GC-rich elements in the betaMyHC promoter is a critical event in down-regulation of betaMyHC gene expression under non-weight-bearing conditions. Conversely, binding of Sp3 to these elements decreased while Sp1 binding increased with nuclear extracts from plantaris muscle exposed to mechanical overload, a stimulus that increases betaMyHC gene expression. In addition, these experiments revealed the existence of an Sp4-DNA binding complex when using adult skeletal muscle nuclear extract was used but not when nuclear extracts from cultured myotubes were used. Sp3 proteins are competitive inhibitors of Sp1-mediated betaMyHC reporter gene transactivation in both Drosophila SL-2 and mouse C2C12 myotubes. Sp4 is a weak activator of betaMyHC gene expression in SL-2 cells, which lack endogenous Sp1 activity, but does not activate betaMyHC gene expression in C2C12 myotubes, which have high levels of Sp1. These results suggest that competitive binding of Sp family proteins regulate betaMyHC gene transcription in response to altered neuromuscular activity." @default.
• W2101717459 created "2016-06-24" @default.
• W2101717459 creator A5016190431 @default.
• W2101717459 creator A5036694129 @default.
• W2101717459 creator A5037969569 @default.
• W2101717459 date "2004-12-01" @default.
• W2101717459 modified "2023-09-27" @default.
• W2101717459 title "Sp3 Proteins Negatively Regulate β Myosin Heavy Chain Gene Expression during Skeletal Muscle Inactivity" @default.
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• W2101717459 doi "https://doi.org/10.1128/mcb.24.24.10777-10791.2004" @default.
• W2101717459 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/533985" @default.
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