| First Author | Han R | Year | 2009 |
| Journal | Proc Natl Acad Sci U S A | Volume | 106 |
| Issue | 31 | Pages | 12573-9 |
| PubMed ID | 19633189 | Mgi Jnum | J:152005 |
| Mgi Id | MGI:4355767 | Doi | 10.1073/pnas.0906545106 |
| Citation | Han R, et al. (2009) Basal lamina strengthens cell membrane integrity via the laminin G domain-binding motif of alpha-dystroglycan. Proc Natl Acad Sci U S A 106(31):12573-9 |
| abstractText | Skeletal muscle basal lamina is linked to the sarcolemma through transmembrane receptors, including integrins and dystroglycan. The function of dystroglycan relies critically on posttranslational glycosylation, a common target shared by a genetically heterogeneous group of muscular dystrophies characterized by alpha-dystroglycan hypoglycosylation. Here we show that both dystroglycan and integrin alpha7 contribute to force-production of muscles, but that only disruption of dystroglycan causes detachment of the basal lamina from the sarcolemma and renders muscle prone to contraction-induced injury. These phenotypes of dystroglycan-null muscles are recapitulated by Large(myd) muscles, which have an intact dystrophin-glycoprotein complex and lack only the laminin globular domain-binding motif on alpha-dystroglycan. Compromised sarcolemmal integrity is directly shown in Large(myd) muscles and similarly in normal muscles when arenaviruses compete with matrix proteins for binding alpha-dystroglycan. These data provide direct mechanistic insight into how the dystroglycan-linked basal lamina contributes to the maintenance of sarcolemmal integrity and protects muscles from damage. |
