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Sarcolemmal indentation in cardiomyopathy with mental retardation and vacuolar myopathy.

Abstract
Muscle biopsies from three patients with cardiomyopathy, mental retardation and increased serum creatine kinase levels revealed scattered fibers with tiny intracytoplasmic vacuoles containing basophilic and acid phosphatase-positive material and slightly increased amounts of PAS-positive granules. These findings are consistent with those seen in the so-called lysosomal glycogen storage disease with normal acid maltase. In addition to the vacuoles, there were occasional folds or indentations in the sarcolemma which were connected to the membrane enclosing the vacuoles. These membranes were well demonstrated histochemically by the nonspecific esterase and acetylcholinesterase stains. On electron microscopy, most of the vacuoles were bounded by membranes with basal lamina. The vacuolar membrane stained positively with antibodies raised to dystrophin, dystrophin-associated glycoproteins, laminin and type 4 collagen, and it was identical to the sarcolemma and its basal lamina. Therefore, the membrane abnormality which causes sarcolemmal folding is probably critical to understanding the pathomechanism of this disease.
AuthorsN Murakami, Y Goto, M Itoh, Y Katsumi, T Wada, E Ozawa, I Nonaka
JournalNeuromuscular disorders : NMD (Neuromuscul Disord) Vol. 5 Issue 2 Pg. 149-55 (Mar 1995) ISSN: 0960-8966 [Print] England
PMID7539316 (Publication Type: Journal Article)
Chemical References
  • Dystrophin
  • Glycogen
Topics
  • Adolescent
  • Adult
  • Basement Membrane (chemistry)
  • Biopsy
  • Cardiomyopathies (complications)
  • Cell Membrane (chemistry)
  • Dystrophin (analysis)
  • Glycogen (metabolism)
  • Humans
  • Immunohistochemistry
  • Intellectual Disability (complications)
  • Male
  • Microscopy, Electron
  • Muscle Fibers, Skeletal (chemistry, pathology, ultrastructure)
  • Muscle, Skeletal (cytology)
  • Muscular Diseases (complications)
  • Sarcolemma (pathology)
  • Staining and Labeling
  • Vacuoles (pathology)

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