title: Glial fibrillary acidic protein and its encoding mRNA exhibit mosaic expression in a glioblastoma multiform cell line of clonal origin.
abstract: The expression of two astroglial differentiation markers, vimentin and glial fibrillary acidic protein, was investigated in a previously established human glioma cell line of clonal origin (GL15). Vimentin immunolabelling was homogeneously expressed in all cells. Glial fibrillary acidic protein and its encoding message, investigated by immunocytochemistry and in situ hybridization, showed a mosaic-like expression. Only 30% of the cell population expressed glial fibrillary acidic protein and its mRNA. Western and Northern blots performed for both markers confirmed the presence of both proteins and messages, and their level was correlated with the observed antigenic and molecular probe labelling. The overall antigenic pattern suggests that GL-15 cells do not belong to the O-2A progenitor cell lineage and may arise from a clonal expansion of astrocyte precursors.
authors.affiliation: Department of Experimental Medicine, University of Perugia, Italy.
authors.forename: V
authors.initials: V
authors.lastname: Bocchini
authors.forename: T
authors.initials: T
authors.lastname: Beccari
authors.forename: C
authors.initials: C
authors.lastname: Arcuri
authors.forename: L
authors.initials: L
authors.lastname: Bruyere
authors.forename: C
authors.initials: C
authors.lastname: Fages
authors.forename: M
authors.initials: M
authors.lastname: Tardy
mesh_terms: D015415:Biomarkers; D015152:Blotting, Northern; D015153:Blotting, Western; D002999:Clone Cells; D004591:Electrophoresis, Polyacrylamide Gel; D005455:Fluorescent Antibody Technique; D005904:Glial Fibrillary Acidic Protein / Q000096:biosynthesis* / Q000276:immunology; D005909:Glioblastoma / Q000378:metabolism*; D006801:Humans; D017403:In Situ Hybridization; D015347:RNA Probes; D012333:RNA, Messenger / Q000096:biosynthesis*; D014407:Tumor Cells, Cultured; D014746:Vimentin / Q000096:biosynthesis / Q000276:immunology
chemical_list: D015415:Biomarkers; D005904:Glial Fibrillary Acidic Protein; D015347:RNA Probes; D012333:RNA, Messenger; D014746:Vimentin