Integrin dysregulation as a possible driver of matrix remodeling in Laminin-deficient congenital muscular dystrophy (MDC1A).

Background: Merosin-deficient congenital muscular dystrophy (MDC1A) is caused by a loss of Laminin-α2. Secondary manifestations include failed regeneration, inflammation, and fibrosis; however, specific pathomechanisms remain unknown.

Objectives: Using the LAMA2 (DyW) mouse model of MDC1A, we sought to determine if Integrin-αV and -α5, known drivers of pathology in other diseases, are dysregulated in dystrophic muscle.

Dysregulation of matricellular proteins is an early signature of pathology in laminin-deficient muscular dystrophy.

Background: MDC1A is a congenital neuromuscular disorder with developmentally complex and progressive pathologies that results from a deficiency in the protein laminin α2. MDC1A is associated with a multitude of pathologies, including increased apoptosis, inflammation and fibrosis. In order to assess and treat a complicated disease such as MDC1A, we must understand the natural history of the disease so that we can identify early disease drivers and pinpoint critical time periods for implementing potential therapies.

Triggering regeneration and tackling apoptosis: a combinatorial approach to treating congenital muscular dystrophy type 1 A.

Merosin-deficient congenital muscular dystrophy type 1A (MDC1A) is an autosomal recessive disorder caused by mutations in the laminin-α2 gene (OMIM: 607855). Currently, no treatment other than palliative care exists for this disease. In our previous work, genetic interventions in the Lama2(Dy-w) mouse model for MDC1A demonstrated that limited regeneration and uncontrolled apoptosis are important drivers of this disease.