title: BOC, an Ig superfamily member, associates with CDO to positively regulate myogenic differentiation.
abstract: CDO is a cell surface receptor-like protein that positively regulates myogenic differentiation. Reported here is the identification of BOC, which, with CDO, defines a newly recognized subfamily within the immunoglobulin superfamily. cdo and boc are co-expressed in muscle precursors in the developing mouse embryo. Like CDO, BOC accelerates differentiation of cultured myoblast cell lines and participates in a positive feedback loop with the myogenic transcription factor, MyoD. CDO and BOC form complexes in a cis fashion via association of both their ectodomains and their intracellular domains. A soluble fusion protein that contains the entire BOC ectodomain functions similarly to full-length BOC to promote myogenic differentiation, indicating that the intracellular region is dispensable for its activity in this system. Furthermore, a dominant-negative form of CDO inhibits the pro-myogenic effects of soluble BOC, suggesting that BOC is dependent on CDO for its activity. CDO and BOC are proposed to be components of a receptor complex that mediates some of the cell-cell interactions between muscle precursors that are required for myogenesis.
authors.affiliation: Department of Biochemistry and Molecular Biology, Mount Sinai School of Medicine, New York, NY 10029, USA. Robert.Krauss@mssm.edu
authors.forename: Jong-Sun
authors.initials: JS
authors.lastname: Kang
authors.forename: Philip J
authors.initials: PJ
authors.lastname: Mulieri
authors.forename: Yulan
authors.initials: Y
authors.lastname: Hu
authors.forename: Lavinia
authors.initials: L
authors.lastname: Taliana
authors.forename: Robert S
authors.initials: RS
authors.lastname: Krauss
mesh_terms: D000469:Alkaline Phosphatase / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D000818:Animals; D015815:Cell Adhesion Molecules; D002454:Cell Differentiation; D002460:Cell Line; D005246:Feedback; D018507:Gene Expression Regulation, Developmental; D011905:Genes, ras; D006801:Humans; D007074:Immunoglobulin G / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D046911:Macromolecular Substances; D008562:Membrane Glycoproteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D018482:Muscle, Skeletal / Q000166:cytology* / Q000196:embryology / Q000378:metabolism*; D010802:Phylogeny; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D025521:Tumor Suppressor Proteins
chemical_list: C107286:CDON protein, human; D015815:Cell Adhesion Molecules; D007074:Immunoglobulin G; D046911:Macromolecular Substances; D008562:Membrane Glycoproteins; D012333:RNA, Messenger; D011993:Recombinant Fusion Proteins; D025521:Tumor Suppressor Proteins; D000469:Alkaline Phosphatase