Isolation and characterization of myogenic satellite cells from the muscular dystrophic hamster.

ABSTRACT

Myogenic satellite cells were isolated from control and dystrophic hamster diaphragms to examine cellular mechanisms involved in the physiology of muscular dystrophy. The Bio 14.6 dystrophic hamster, which possesses a defect in the delta-sarcoglycan gene, develops biochemical and physical symptoms of Duchenne-like and limb girdle muscular dystrophies. Because primary cultures of the control and dystrophic satellite cells became extensively contaminated with non-myogenic cells during proliferation, cell clones were developed to provide pure cultures for study. Cell culture conditions were optimized with the use of Ham's F-12K medium containing 10% fetal bovine serum +5% horse serum + 10 ng/mL basic fibroblast growth factor + 50 microg/mL porcine gelatin. Proliferation rates of the two clonal cultures were similar between the two lines. Satellite cell-derived myotubes from both primary cultures and clones differed between control and dystrophic animals. Dystrophic myotubes tended to be long and narrow, while the control-derived myotubes were broader. Measurement of muscle-specific creatine kinase during differentiation revealed that the dystrophic myotubes possessed higher creatine kinase levels than control myotubes (up to 146-fold at 168 h). The results demonstrate that satellite cells can be isolated from the hamster and may provide a useful tool to study muscular dystrophies associated with defects in the sarcoglycan complex and the involvement of sarcoglycans in normal skeletal muscle growth and development.