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- W1964734357 abstract "Merosin-deficient congenital muscular dystrophy 1A (MDC1A) is a devastating neuromuscular disease that results in children being confined to a wheelchair, requiring ventilator assistance to breathe and premature death. MDC1A is caused by mutations in the LAMA2 gene, which results in the partial or complete loss of laminin-211 and laminin-221, the major laminin isoforms found in the basal lamina of skeletal muscle. MDC1A patients exhibit reduced α7β1 integrin; however, it is unclear how the secondary loss of α7β1 integrin contributes to MDC1A disease progression. To investigate whether restoring α7 integrin expression can alleviate the myopathic phenotype observed in MDC1A, we produced transgenic mice that overexpressed the α7 integrin in the skeletal muscle of the dy(W⁻/⁻) mouse model of MDC1A. Enhanced expression of the α7 integrin restored sarcolemmal localization of the α7β1 integrin to laminin-α2-deficient myofibers, changed the composition of the muscle extracellular matrix, reduced muscle pathology, maintained muscle strength and function and improved the life expectancy of dy(W⁻/⁻) mice. Taken together, these results indicate that enhanced expression of α7 integrin prevents muscle disease progression through augmentation and/or stabilization of the existing extracellular matrix in laminin-α2-deficient mice, and strategies that increase α7 integrin in muscle might provide an innovative approach for the treatment of MDC1A." @default.
- W1964734357 created "2016-06-24" @default.
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- W1964734357 date "2011-07-01" @default.
- W1964734357 modified "2023-10-16" @default.
- W1964734357 title "Transgenic overexpression of the α7 integrin reduces muscle pathology and improves viability in the dyW mouse model of merosin-deficient congenital muscular dystrophy type 1A" @default.
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- W1964734357 doi "https://doi.org/10.1242/jcs.083311" @default.
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