Function
Integrin alpha-7/beta-1 is the primary laminin receptor on skeletal myoblasts and adult myofibers. During myogenic differentiation, it may induce changes in the shape and mobility of myoblasts, and facilitate their localization at laminin-rich sites of secondary fiber formation. It is involved in the maintenance of the myofibers' cytoarchitecture as well as their anchorage, viability, and functional integrity. Isoform Alpha-7X2B and isoform Alpha-7X1B promote myoblast migration on laminin 1 and laminin 2/4, but isoform Alpha-7X1B exhibits less activity on laminin 1 (In vitro). It functions as a Schwann cell receptor for laminin-2 and as a receptor of COMP, mediating its effect on vascular smooth muscle cells (VSMCs) maturation. It is essential for promoting contractile phenotype acquisition in differentiated airway smooth muscle (ASM) cells.