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1 Department of Pediatrics, Magee-Women's Research Institute, Duchenne Muscular Dystrophy Research Center, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15213; and 2 Research Center for Genetic Medicine, Children's National Medical Center, Duchenne Muscular Dystrophy Research Center, Washington, DC 20010
Muscular dystrophies are a
clinically and genetically heterogeneous group of disorders that
show myofiber degeneration and regeneration. Identification of animal
models of muscular dystrophy has been instrumental in research on the
pathogenesis, pathophysiology, and treatment of these disorders. We
review our understanding of the functional status of dystrophic
skeletal muscle from selected animal models with a focus on
1) the mdx mouse model of Duchenne muscular
dystrophy, 2) the Bio 14.6
-sarcoglycan-deficient hamster model of limb-girdle muscular dystrophy, and 3) transgenic
null mutant murine lines of sarcoglycan (
,
,
, and
)
deficiencies. Although biochemical data from these models suggest that
the dystrophin-sarcoglycan-dystroglycan-laminin network is critical for
structural integrity of the myofiber plasma membrane, emerging studies
of muscle physiology suggest a more complex picture, with specific
functional deficits varying considerably from muscle to muscle and
model to model. It is likely that changes in muscle structure and
function, downstream of the specific, primary biochemical deficiency,
may alter muscle contractile properties.
dystrophin; mdx mouse; sarcoglycanopathies
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