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• W2080509056 abstract "Muscle regulatory factor 4 (MRF4) is a member of the family of myogenic transcription factors, including MyoD, myogenin, and myf-5, that are necessary for the commitment and differentiation of mesoderm to skeletal muscle. Although the function of these transcription factors during embryonic development has been demonstrated, their role in adult muscle has remained elusive. Regulation of the MRF4 gene differs from the genes encoding the other myogenic factors in that its transcripts accumulate in neonatal muscle during maturation and continue to be expressed at relatively high levels in the adult. On the basis of its mRNA expression pattern, MRF4 has been suggested to regulate genes encoding adult contractile proteins and acetylcholine receptor subunits. To test this hypothesis, a specific antiserum was developed to study MRF4 protein expression in adult innervated and denervated muscle, because MRF4 mRNA levels increase by approximately threefold 1 day after nerve resection. By using three different immunohistochemical methods that vary widely in sensitivity, we were unable to detect MRF4 immunoreactivity in adult innervated muscles. The same results were obtained with another MRF4 antiserum generated independently. In contrast, any of these three immunologic techniques readily detected MRF4 immunoreactivity in myofiber and satellite cell nuclei of muscles denervated for 24 hours. The highest proportion of immunopositive nuclei (80%) was found 2–3 days after denervation. Immunoreactivity was no longer detectable by 14 days. There was no differential accumulation of MRF4 protein in the nuclei of satellite cells nor in sole plate (synaptic) nuclei at any time after denervation. No differences were found in the temporal accumulation of MRF4 in nuclei of type I and type II denervated myofibers, consistent with the similar distribution of MRF4 mRNAs in slow- and fast-twitch muscles. Our results are consistent with the lack of phenotype observed in the adult muscles of MRF4-null mutant mice observed by others and suggest that MRF4 may have important roles in the gene programs activated after denervation and during muscle regeneration. Dev Dyn 2000;218:438–451. Published 2000 Wiley-Liss, Inc." @default.
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• W2080509056 date "2000-01-01" @default.
• W2080509056 modified "2023-10-11" @default.
• W2080509056 title "Denervation induces a rapid nuclear accumulation of MRF4 in mature myofibers" @default.
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• W2080509056 doi "https://doi.org/10.1002/1097-0177(200007)218:3<438::aid-dvdy1001>3.0.co;2-6" @default.
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