Sarcospan (SSPN)

Sarcospan is a 25 kDa integral transmembrane protein with four predicted transmembrane domains and tetraspanin-like structure, essential for forming and stabilizing the dystrophin-glycoprotein complex at the muscle cell membrane[1][2][3][5]. It tightly associates with sarcoglycans and facilitates their clustering, linking cellular cytoskeleton to the extracellular matrix[1][2][3][5]. Sarcospan is critical for skeletal muscle integrity; its deficiency results in impaired membrane stability, defective cell adhesion, and compromised muscle regeneration[1][2][3]. Overexpression of sarcospan has therapeutic potential in models of Duchenne muscular dystrophy, as it promotes membrane stability, enhances the surface presence of compensatory adhesion complexes, and facilitates Akt-driven muscle regeneration[1][4]. Mutations affecting sarcospan or its interacting partners can result in muscular dystrophy, notably autosomal recessive limb-girdle muscular dystrophy[2][3]. Sarcospan participates in the formation of membrane scaffolds that anchor key adhesion complexes and protect muscle fibers from contraction-induced damage[3][5].

Other names

SSPNDystrophin-glycoprotein complex subunit sarcospanSarcospan, 25 kDa

Stabilization and remodeling of membrane adhesion complexes to link extracellular matrix to intracellular cytoskeleton; Regulation of protein abundance (utrophin, α7β1 integrin, dystrophin); Activation/modulation of Akt signaling pathways for muscle regeneration; Scaffolding and stabilization of DGC to prevent membrane damage