title: Monoclonal antibodies to glioma-derived growth factor(s).
abstract: Several monoclonal antibodies (mAb) reactive against a high-molecular-weight growth factor from human glioblastoma cell lines have been produced by immunizing mice with partially purified preparations from conditioned media. Antibody-secreting colonies were selected by their capacity to bind 35S-labeled glioma cell protein and by reactivity in indirect enzyme-linked immunoadsorbent assay (ELISA), using high-molecular-weight gel filtration fractions and preparative isoelectric focusing fractions containing growth factor activities. Two of the select mAbs (20F3 and 12A12) depleted mitogenic activity (> 50% inhibition, p < 0.05) from gel filtration fractions by immunoprecipitation, but could not neutralize mitogenic activity directly. Mitogenic activity recovered from affinity columns prepared with mAb 20F3 eluted at 48% and 52% acetonitrile from HPLC C4 reversed-phase columns. Immunoprecipitation of 35S-labeled cell lysates with 20F3 followed by resolution with SDS-PAGE autoradiography revealed one unique protein of 170 kD. Established glioma cell line D-54 MG showed perinuclear and cytoplasmic staining with mAb 20F3. mAb 20F3 should prove useful in purification and characterization of these glioma-derived growth factor(s).
authors.affiliation: Laboratories of Medical Genetics, University of Alabama at Birmingham 35294-0017.
authors.forename: E
authors.initials: E
authors.lastname: Lyon
authors.forename: G Y
authors.initials: GY
authors.lastname: Gillespie
mesh_terms: D016475:3T3 Cells; D000818:Animals; D000911:Antibodies, Monoclonal; D000912:Antibodies, Neoplasm; D002846:Chromatography, Affinity; D005909:Glioblastoma / Q000276:immunology* / Q000378:metabolism*; D006133:Growth Substances / Q000276:immunology*; D006801:Humans; D007150:Immunohistochemistry; D051379:Mice; D009500:Neutralization Tests; D011233:Precipitin Tests; D014407:Tumor Cells, Cultured / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000912:Antibodies, Neoplasm; D006133:Growth Substances