Low Muscle Levels of Pyridoxine in McArdle's Syndrome

Ronald G. Haller, Walter B. Dempsey, Howard Feit, J. D. Cook, James P. Knochel

Research output: Contribution to journalArticle

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Abstract

Pyridoxal phosphate is a covalently bound cofactor of glycogen phosphorylase. Phosphorylase is a major muscle protein and therefore represents a significant pool of pyridoxal phosphate. Muscle pyridoxine content was measured in three patients with myophosphorylase deficiency (McArdle's syndrome) in whom there was a marked diminution or absence of phosphorylase protein as determined by acrylamide gel electrophoresis. Total muscle pyridoxine in the patients with McArdle's syndrome (0.55 ± 0.08 μg/g wet weight, mean ± SD) was markedly reduced compared with 11 human control subjects who had normal levels of muscle phosphorylase (total muscle B6 = 2.49 ± 0.47). Despite such drastically low levels of muscle pyridoxine, these patients had no evidence of pyridoxine "deficiency." These results suggest that low muscle B6 in McArdle's syndrome represents the specific loss of pyridoxal phosphate normally bound to phosphorylase apoenzyme and imply that phosphorylase pyridoxal phosphate accounts for 75 to 80 percent of the total pyridoxine in normal human muscle.

Original languageEnglish (US)
Pages (from-to)217-220
Number of pages4
JournalThe American journal of medicine
Volume74
Issue number2
DOIs
StatePublished - 1983

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Glycogen Storage Disease Type V
Pyridoxine
Phosphorylases
Pyridoxal Phosphate
Muscles
Vitamin B 6 Deficiency
Apoenzymes
Glycogen Phosphorylase
Muscle Proteins
Acrylamide
Electrophoresis
Gels
Weights and Measures

ASJC Scopus subject areas

  • Nursing(all)

Cite this

Low Muscle Levels of Pyridoxine in McArdle's Syndrome. / Haller, Ronald G.; Dempsey, Walter B.; Feit, Howard; Cook, J. D.; Knochel, James P.

In: The American journal of medicine, Vol. 74, No. 2, 1983, p. 217-220.

Research output: Contribution to journalArticle

Haller, Ronald G. ; Dempsey, Walter B. ; Feit, Howard ; Cook, J. D. ; Knochel, James P. / Low Muscle Levels of Pyridoxine in McArdle's Syndrome. In: The American journal of medicine. 1983 ; Vol. 74, No. 2. pp. 217-220.
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