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X-linked Recessive Congenital Muscle Fiber Hypotrophy With Central NucleiAbnormalities of Growth and Adenylate Cyclase in Muscle Tissue Cultures
V. Askanas, MD, PhD;
W. K. Engel, MD;
N. B. Reddy, PhD;
P. G. Barth, MD;
J. Bethlem, MD;
D. R. Krauss, MD;
M. E. Hibberd, MD;
J. V. Lawrence;
L. S. Carter
Arch Neurol. 1979;36(10):604-609.
Abstract
• Muscle cells in cultures established from biopsy specimens of two children with an infantile-fatal form of X-linked recessive muscle fiber smallness with central nuclei showed an unusual ability to proliferate through numerous passages. Ultrastructurally, the cultured muscle fibers appeared very immature even after several weeks. The nuclei were large, the number of ribosomes was greatly increased, the myofibrils remained unstriated, and glycogen was accumulated in large lakes. The plasmalemma bound concanavalin A,  -bungarotoxin, and ruthenium red normally, but with tannic acid it did not show the dark binding of mature fibers. Biochemically, in the cultured muscle fibers, β-adrenergic receptors were quantitatively normal. The level of adenylate cyclase in membranes was less than in cultured normal muscle; this defect could be responsible for impaired control mechanisms resulting in the other abnormalities observed.
Author Affiliations
From the National Institute of Neurological and Communicative Disorders and Stroke, National Institutes of Health, Bethesda, Md (Drs Askanas, Engel, and Reddy; Ms Lawrence and Ms Carter), the Department of Neurology, Wilhemina Gasthuis, University of Amsterdam, The Netherlands (Drs Barth and Bethlem), and the Scott White Clinic, Temple, Tex (Drs Krauss and Hibberd).
Footnotes
Accepted for publication Feb 25, 1979.
Reprint requests to Rm 10D18, Clinical Center, National Institutes of Health, Bethesda, MD 20014 (Dr Askanas).
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