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Ultrastructure of diaphragm from dystrophic α-sarcoglycan-null mice �

By Anna Jakubiec-puka, Donatella Biral and Kazimierz Krawczyk

Abstract

α-Sarcoglycan is a 50 kDa single-pass transmembrane glycoprotein exclusively expressed in striated muscle that, together with β-, γ-, and δ-sarcoglycan, forms a sub-complex at the muscle fibre cell membrane. The sarcoglycans are components of the dystrophin-associated glycoprotein (DAG) complex which forms a mechanical link between the intracellular cytoskeleton and extracellular matrix. The DAG complex function is to protect the muscle membrane from the stress of contractile activity and as a structure for the docking of signalling proteins. Genetic defects of DAG components cause muscular dystrophies. A lack or defects of α-sarcoglycan causes the severe type 2D limb girdle muscular dystrophy. α-Sarcoglycan-null (Sgca-null) mice develop progressive muscular dystrophy similar to the human disorder. This animal model was used in the present work for an ultrastructural study of diaphragm muscle. Diaphragm from Sgca-null mouse presents a clear dystrophic phenotype, with necrosis, regeneration, fibre hypertrophy and splitting, excess of collagen and fa�y infiltration. Some abnormalities were also observed, such as centrally located nuclei of abnormal shape, fibres containing inclusion bodies within the contractile structure, and fibres with electron-dense material dispersed over almost the entire cell. Additionally, unusual interstitial cells of uncertain identity were detected within muscle fibres. The abnormal ultrastructure of the diaphragm from Sgca-null mice is discussed

Topics: α-sarcoglycan, muscle ultrastructure, myopathy, sarcoglycan-deficient mouse
Year: 2014
OAI identifier: oai:CiteSeerX.psu:10.1.1.416.7960
Provided by: CiteSeerX
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