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. 1982 Mar 1;201(3):445–453. doi: 10.1042/bj2010445

Erythrocyte-ghost Ca2+-stimulated Mg2+-dependent adenosine triphosphatase in Duchenne muscular dystrophy.

M J Dunn, A H Burghes, V Dubowitz
PMCID: PMC1163668  PMID: 6124239

Abstract

The Ca2+-stimulated Mg2-dependent ATPase activities (Ca2+-ATPase) of erythrocyte-ghost membranes from patients with Duchenne muscular dystrophy (DMD) and carriers of DMD were compared with activities of normal controls. The Ca2+-ATPase activity of DMD-patient ghost preparations was found to follow the same pattern of activation by Ca2+ as the control membranes. However, the Ca2+-ATPase activity in DMD and some DMD-carrier preparations was substantially elevated compared with controls. To characterize further the elevated Ca2+-ATPase activity found in DMD-patient ghost membrane preparations, we estimated kinetic parameters using both fine adjustment and weighting methods to analyse our experimental data. It was established that in both DMD and DMD-carrier preparations the increase in Ca2+-ATPase activity was reflected by a significant increase in Vmax. rather than by any change in Km. The response of the membrane Ca2+-ATPase activity to changes in temperature was also investigated. In all preparations a break in the Arrhenius plot occurred at 20 degrees C, and in DMD and DMD-carrier preparations an elevated Ca2+-ATPase activity was detected at all temperatures. Above 20 degrees C the activation energy for all types of preparation was the same, whereas below this temperature there appeared to be an elevated activation in DMD and DMD-carrier preparations compared with normal controls. The concept that a generalized alteration in the physicochemical nature of the membrane lipid domain may be responsible for the many abnormal membrane properties reported in DMD is discussed.

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