Integrins and dystroglycan on muscle fibers and nerve cells

Integrins and dystroglycan are the two primary classes of transmembrane receptors that anchor muscle fibers and nerve cells to the extracellular matrix (ECM) (UniProt P55051, Q13683). In skeletal muscle, the alpha7beta1 integrin and the dystroglycan complex (comprising alpha and beta subunits) serve as critical mechanical links between the laminin-rich basement membrane and the internal cytoskeleton (Michele & Campbell, 2003). These receptors are essential for maintaining the structural integrity of the sarcolemma during muscle contraction and for mediating signal transduction pathways that regulate cell survival and differentiation (Belkin & Burridge, 2000). Mutations or deficiencies in these proteins, or the enzymes responsible for their post-translational modification (particularly for dystroglycan), lead to various forms of muscular dystrophy, such as Duchenne and congenital muscular dystrophies, as well as neurological disorders like Walker-Warburg syndrome (UniProt P55051). In nerve cells, these molecules are involved in the formation of the neuromuscular junction and the maintenance of the blood-brain barrier. Therapeutic strategies often focus on upregulating integrin expression to compensate for the loss of the dystrophin-glycoprotein complex or restoring proper glycosylation of alpha-dystroglycan to maintain muscle stability (Rooney et al., 2012).

Other names

Laminin receptorsDystrophin-associated glycoprotein complex componentsDGC componentsAlpha7beta1 integrinDystroglycan 1 (DAG1)Integrin alpha-7 (ITGA7)

Restoration of the mechanical linkage between the extracellular matrix and the intracellular cytoskeleton to prevent sarcolemmal rupture and muscle fiber degeneration.