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Erythrocyte calcium transport in myotonic and facioscapulohumeral muscular dystrophy

From the Department of Neurology, Hospital of the University of Pennsylvania and the Children's Hospital of Philadelphia.

We studied calcium transport in inside-out erythrocyte vesicles from patients with myotonic or facioscapulohumeral dystrophy and age- and sex-matched controls. No significant difference was noted in the affinity of the transporter for calcium or the maximum reaction velocity. Under identical conditions, we previously found that Duchenne dystrophy membranes differed from controls in affinity for calcium and maximum velocity. The results reported here imply that the abnormality in Duchenne dystrophy is specific and not an abnormality found in all forms of dystrophy.

Address correspondence and reprint requests to Dr. Mollman, Department of Neurology, 3400 Spruce Street, Philadelphia, PA 19104.

Supported by United States Public Health Service Grants NS 08075, HD 08536, and RR 05415, and by a grant from the Muscular Dystrophy Association of America. Dr. Mollman is the recipient of a Teacher Investigator Development Award NS 00563.

Accepted for publication March 8, 1984.