Tetraspanin CD82 Associates with Trafficking Vesicle in Muscle Cells and Binds to Dysferlin and Myoferlin

• Published in: Advanced biology 2023-12, Vol.7 (12), p.e2300157-n/a
• Main Authors: Fontelonga, Tatiana, Hall, Arielle J., Brown, Jaedon L., Jung, Youngsook L., Alexander, Matthew S., Dominov, Janice A., Mouly, Vincent, Vieira, Natassia, Zatz, Mayana, Vainzof, Mariz, Gussoni, Emanuela
• Format: Article
• Language: English
• Subjects: dysferlin; Dysferlin - genetics; dysferlinopathy; Humans; Kangai-1 Protein; Life Sciences; limb girdle muscular dystrophy; Membrane Proteins - genetics; Membrane Proteins - metabolism; Miyoshi myopathy; Muscle Fibers, Skeletal - metabolism; Muscle Proteins - genetics; Muscle Proteins - metabolism; Muscular Dystrophies - metabolism; myoferlin; satellite cells; Tetraspanins
• ISSN: 2701-0198; 2701-0198
• DOI: 10.1002/adbi.202300157

Tetraspanins organize protein complexes at the cell membrane and are responsible for assembling diverse binding partners in changing cellular states. Tetraspanin CD82 is a useful cell surface marker for prospective isolation of human myogenic progenitors and its expression is decreased in Duchenne muscular dystrophy (DMD) cell lines. The function of CD82 in skeletal muscle remains elusive, partly because the binding partners of this tetraspanin in muscle cells have not been identified. CD82‐associated proteins are sought to be identified in human myotubes via mass spectrometry proteomics, which identifies dysferlin and myoferlin as CD82‐binding partners. In human dysferlinopathy (Limb girdle muscular dystrophy R2, LGMDR2) myogenic cell lines, expression of CD82 protein is near absent in two of four patient samples. In the cell lines where CD82 protein levels are unaffected, increased expression of the ≈72 kDa mini‐dysferlin product is identified using an antibody recognizing the dysferlin C‐terminus. These data demonstrate that CD82 binds dysferlin/myoferlin in differentiating muscle cells and its expression can be affected by loss of dysferlin in human myogenic cells. CD82 (purple line) is co‐expressed with CD56 (orange) in unaffected myoblasts. In myotubes, CD82 binds both dysferlin and myoferlin and it is co‐expressed in vesicles (purple circles). Expression of CD82 is nearly absent in some dysferlinopathy patients, both at the cell surface of myoblasts and in myotubes.