Coordinated expression of phosphorylase kinase subunits in regenerating skeletal muscle

Kendra C. Cawley, Carol G. Akita, Mark A. Wineinger, Richard C. Carlsen, Fredric A Gorin, Donal A. Walsh

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


The developmental expression of the α, β, and γ subunits of skeletal muscle phosphorylase kinase has been examined in regenerating muscle. Rat extensor digitorum longus (EDL) muscles, treated with bupivacaine, promptly undergo a rapid degenerate of the muscle, followed by regeneration and recovery of essentially normal morphology and physiology by 3-4 weeks post-treatment (Hall-Craggs, E. C. B., and Seyan, H. S. (1975) Exp. Neurol. 46, 345-354). Phosphorylase kinase activity dropped to ∼10% of control within 3 days of bupivacaine treatment and remained at this low level for several days but had attained at least 60% of normal levels by day 21. The pH 6.8/8.2 activity ratio was unusually high during the period of low activity, suggesting that the catalytic activity was not under normal regulation at this time. The subunit mRNAs were readily detected in control EDL but were undetectable at day 3 post-bupivacaine treatment. Very small amounts of message for all three subunits were evident by day 6 and began to approach normal levels by day 12-15. The mRNA for both the α and α′ subunits of phosphorylase kinase exhibited a similar pattern of recovery, as did also the mRNA for phosphorylase. In contrast to both phosphorylase kinase and phosphorylase, actin mRNA exhibited a quite a different pattern, with a nearly full recovery of message levels by day 6 post-bupivacaine. These data indicate that synthesis of phosphorylase and the α, β, and γ subunits of phosphorylase kinase appears to be coordinately regulated at the level of message accumulation and that the expression of phosphorylase kinase activity is likely to be also regulated post-transcriptionally.

Original languageEnglish (US)
Pages (from-to)17287-17295
Number of pages9
JournalJournal of Biological Chemistry
Issue number24
StatePublished - Aug 25 1992

ASJC Scopus subject areas

  • Biochemistry


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