title: Distinctive ganglioside patterns revealed by anti-ganglioside antibody binding to differentiating CG-4 oligodendrocytes.
abstract: Oligodendrocytes are central nervous system glial cells responsible for myelination of neuronal axons. During brain development oligodendrocyte progenitor cells progress through a series of morphologically and immunohistochemically distinct differentiation steps leading to mature myelin-producing oligodendrocytes. Much of this same differentiation sequence is expressed in vitro by primary oligodendrocyte progenitor cells, and by the clonal progenitor cell line CG-4. We report the use of highly specific monoclonal antibodies against GM1, GD1a, GD1b, GT1b, and GQ1b to determine major brain ganglioside expression and morphological distribution during CG-4 differentiation in vitro. Prominent anti-GD1b antibody stained defined a highly arborized intermediate stage of oligodendrocyte differentiation. In contrast, anti-GT1b antibody bound to discrete patches on the cell bodies of early progenitor cells and more mature oligodendrocytes, and to sites of progenitor arborization. The other anti-ganglioside antibodies tested did not bind above background levels. Cells with anti-GD1b antibody binding and morphology similar to those in differentiating CG-4 cells were detected in rat brain primary cell cultures enriched in oligodendrocyte precursors. The remarkably distinctive ganglioside immunoreactivity on differentiating oligodendrocytes suggests the possibility of a functional role for their surface expression.
authors.affiliation: Department of Pharmacology, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
authors.forename: R L
authors.initials: RL
authors.lastname: Schnaar
authors.forename: P
authors.initials: P
authors.lastname: Longo
authors.forename: L J
authors.initials: LJ
authors.lastname: Yang
authors.forename: T
authors.initials: T
authors.lastname: Tai
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D001921:Brain / Q000166:cytology / Q000378:metabolism; D002454:Cell Differentiation; D002460:Cell Line; D002478:Cells, Cultured; D005732:Gangliosides / Q000276:immunology / Q000378:metabolism*; D007150:Immunohistochemistry; D009836:Oligodendroglia / Q000166:cytology / Q000378:metabolism*; D051381:Rats; D013234:Stem Cells / Q000166:cytology / Q000378:metabolism
chemical_list: D000911:Antibodies, Monoclonal; D005732:Gangliosides; C033851:ganglioside, GD1b; C016481:trisialoganglioside GT1