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Loss of Dystrophin and β-Sarcoglycan, Respectively, Significantly Exacerbates the Phenotype of Laminin α2 Chain-Deficient Animals.

Författare

Summary, in English

The adhesion molecule laminin α2 chain interacts with the dystrophin-glycoprotein complex, contributes to normal muscle function, and protects skeletal muscles from damage. Complete loss of the laminin α2 chain in mice results in a severe muscular dystrophy phenotype and death at approximately 3 weeks of age. However, it is not clear if the remaining members of the dystrophin-glycoprotein complex further protect laminin α2 chain-deficient skeletal muscle fibers from degeneration. Hence, we generated mice deficient in laminin α2 chain and dystrophin (dy(3K)/mdx) and mice devoid of laminin α2 chain and β-sarcoglycan (dy(3K)/Sgcb). Severe muscular dystrophy and a lack of nourishment inevitably led to massive muscle wasting and death in double-knockout animals. The dy(3K)/Sgcb mice were generally more severely affected than dy(3K)/mdx mice. However, both double-knockout strains displayed exacerbated muscle degeneration, inflammation, fibrosis, and reduced life span (5 to 13 days) compared with single-knockout animals. However, neither extraocular nor cardiac muscle was affected in double-knockout animals. Our results suggest that, although laminin α2 chain, dystrophin, and β-sarcoglycan are all part of the same adhesion complex, they have complementary, but nonredundant, roles in maintaining sarcolemmal integrity and protecting skeletal muscle fibers from damage. Moreover, the double-knockout mice could potentially serve as models in which to study extremely aggressive muscle-wasting conditions.

Avdelning/ar

Publiceringsår

2014

Språk

Engelska

Sidor

740-752

Publikation/Tidskrift/Serie

American Journal of Pathology

Volym

184

Issue

3

Dokumenttyp

Artikel i tidskrift

Förlag

American Society for Investigative Pathology

Ämne

  • Cell and Molecular Biology

Status

Published

Forskningsgrupp

  • Muscle Biology

ISBN/ISSN/Övrigt

  • ISSN: 1525-2191