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1 Departments of Orthopaedics, Bioengineering, and Applied Mechanics and Engineering Sciences, Biomedical Sciences Graduate Group, University of California, San Diego and Veterans Administration Medical Centers, San Diego, California 92161; 2 Department of Hand Surgery, Sahlgrenska University Hospital, S-413 45 Göteborg, Sweden; and 3 Department of Cell Biology, Baylor College of Medicine, Houston, Texas 77030
The functional role of the skeletal muscle intermediate filament system was investigated by measuring the magnitude of muscle force loss after cyclic eccentric contraction (EC) in normal and desmin null mouse extensor digitorum longus muscles. Isometric stress generated was significantly greater in wild-type (313 ± 8 kPa) compared with knockout muscles (276 ± 13 kPa) before EC (P < 0.05), but 1 h after 10 ECs, both muscle types generated identical levels of stress (~250 kPa), suggesting less injury to the knockout. Differences in injury susceptibility were not explained by the different absolute stress levels imposed on wild-type versus knockout muscles (determined by testing older muscles) or by differences in fiber length or mechanical energy absorbed. Morphometric analysis of longitudinal electron micrographs indicated that Z disks from knockout muscles were more staggered (0.36 ± 0.03 µm) compared with wild-type muscles (0.22 ± 0.03 µm), which may indicate that the knockout cytoskeleton is more compliant. These data demonstrate that lack of the intermediate filament system decreases isometric stress production and that the desmin knockout muscle is less vulnerable to mechanical injury.
intermediate filaments; cytoskeletal; muscle injury; biomechanics; aging
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