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© The Rockefeller University Press, 0021-9525/1999//1259 $5.00
The Journal of Cell Biology, Volume 144, Number 6, , 1999 1259-1270

Extensive but Coordinated Reorganization of the Membrane Skeleton in Myofibers of Dystrophic (mdx) Mice

Department of Physiology, School of Medicine, University of Maryland, Baltimore, Maryland 21201

We used immunofluorescence techniques and confocal imaging to study the organization of the membrane skeleton of skeletal muscle fibers of mdx mice, which lack dystrophin. β-Spectrin is normally found at the sarcolemma in costameres, a rectilinear array of longitudinal strands and elements overlying Z and M lines. However, in the skeletal muscle of mdx mice, β-spectrin tends to be absent from the sarcolemma over M lines and the longitudinal strands may be disrupted or missing. Other proteins of the membrane and associated cytoskeleton, including syntrophin, β-dystroglycan, vinculin, and Na,K-ATPase are also concentrated in costameres, in control myofibers, and mdx muscle. They also distribute into the same altered sarcolemmal arrays that contain β-spectrin. Utrophin, which is expressed in mdx muscle, also codistributes with β-spectrin at the mutant sarcolemma. By contrast, the distribution of structural and intracellular membrane proteins, including -actinin, the Ca-ATPase and dihydropyridine receptors, is not affected, even at sites close to the sarcolemma. Our results suggest that in myofibers of the mdx mouse, the membrane- associated cytoskeleton, but not the nearby myoplasm, undergoes widespread coordinated changes in organization. These changes may contribute to the fragility of the sarcolemma of dystrophic muscle.

Key Words: sarcolemma • membrane skeleton • muscular dystrophy • spectrin • dystrophin

Abbreviations used in this paper: DHPR, dihydropyridine receptor; SERCA, Ca-ATPase of the sarcoplasmic reticulum.

Our research has been supported by grants to R.J. Bloch from the National Institutes of Health (NS 17282) and from the Muscular Dystrophy Association.

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