Subproteomics analysis of Ca+-binding proteins demonstrates decreased calsequestrin expression in dystrophic mouse skeletal muscle

European Journal of Biochemistry
Philip DoranK Ohlendieck

Abstract

Duchenne muscular dystrophy represents one of the most common hereditary diseases. Abnormal ion handling is believed to render dystrophin-deficient muscle fibres more susceptible to necrosis. Although a reduced Ca(2+) buffering capacity has been shown to exist in the dystrophic sarcoplasmic reticulum, surprisingly no changes in the abundance of the main luminal Ca(2+) reservoir protein calsequestrin have been observed in microsomal preparations. To address this unexpected finding and eliminate potential technical artefacts of subcellular fractionation protocols, we employed a comparative subproteomics approach with total mouse skeletal muscle extracts. Immunoblotting, mass spectrometry and labelling of the entire muscle protein complement with the cationic carbocyanine dye 'Stains-All' was performed in order to evaluate the fate of major Ca(2+)-binding proteins in dystrophin-deficient skeletal muscle fibres. In contrast to a relatively comparable expression pattern of the main protein population in normal vs. dystrophic fibres, our analysis showed that the expression of key Ca(2+)-binding proteins of the luminal sarcoplasmic reticulum is drastically reduced. This included the main terminal cisternae constituent, calsequestrin, ...Continue Reading

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