Profiling of Age-Related Changes in theTibialis AnteriorMuscle Proteome of the mdx Mouse Model of Dystrophinopathy

Author:

Carberry Steven1,Zweyer Margit2,Swandulla Dieter2,Ohlendieck Kay1

Affiliation:

1. Department of Biology, National University of Ireland, Maynooth, Co. Kildare, Ireland

2. Department of Physiology II, University of Bonn, 53115 Bonn, Germany

Abstract

X-linked muscular dystrophy is a highly progressive disease of childhood and characterized by primary genetic abnormalities in the dystrophin gene. Senescent mdx specimens were used for a large-scale survey of potential age-related alterations in the dystrophic phenotype, because the established mdx animal model of dystrophinopathy exhibits progressive deterioration of muscle tissue with age. Since the mdxtibialis anteriormuscle is a frequently used model system in muscular dystrophy research, we employed this particular muscle to determine global changes in the dystrophic skeletal muscle proteome. The comparison of mdx mice aged 8 weeks versus 22 months by mass-spectrometry-based proteomics revealed altered expression levels in 8 distinct protein species. Increased levels were shown for carbonic anhydrase, aldolase, and electron transferring flavoprotein, while the expressions of pyruvate kinase, myosin, tropomyosin, and the small heat shock protein Hsp27 were found to be reduced in aged muscle. Immunoblotting confirmed age-dependent changes in the density of key muscle proteins in mdx muscle. Thus, segmental necrosis in mdxtibialis anteriormuscle appears to trigger age-related protein perturbations due to dystrophin deficiency. The identification of novel indicators of progressive muscular dystrophy might be useful for the establishment of a muscle subtype-specific biomarker signature of dystrophinopathy.

Funder

National University of Ireland, Maynooth

Publisher

Hindawi Limited

Subject

Health, Toxicology and Mutagenesis,Genetics,Molecular Biology,Molecular Medicine,General Medicine,Biotechnology

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