Histochemical Phosphorylase Activity in Regenerating Muscle Fibers from Myophosphorylase-Deficient Patients

See allHide authors and affiliations

Science  01 Sep 1972:
Vol. 177, Issue 4051, pp. 795-797
DOI: 10.1126/science.177.4051.795


Fresh frozen sections of mature skeletal muscle fibers from patients with genetically determined "absence" of skeletal muscle phosphorylase (McArdle's disease) have no histochemical phosphorylase activity. That regenerating muscle fibers, in vitro and in vivo, from such patients do have histochemical phosphorylase activity present suggests a loss of enzyme activity with fiber maturity.