title: GD3 expression by cultured human tumor cells of neuroectodermal origin.
abstract: Seven monoclonal antibodies (mAbs) reactive with ganglioside II3(NeuAc)2-LacCer (GD3) were generated; four of these mAbs (DMAb-21, DMAb-22, DMAb-23, and DMAb-24) by immunizing mice with GD3 adsorbed to Salmonella minnesota and the remaining three (DMAb-7, DMAb-8, and DMAb-17) with melanoma line SK-MEL 28, which contains 1.4 nmol sialic acid of GD3 per mg protein. The specificities of the mAbs were defined by high-performance thin-layer chromatography (HPTLC) immunostain and solid-phase radioimmunoassay (SP-RIA) with a panel of purified gangliosides. DMAb-7 and DMAb-8 reacted with GD3, IV3(NeuAc)2nLcOse4Cer(3',8'-LD1), and very weakly with IV3(NeuAc)2II3NeuAcGgOse4Cer (GT1a), but not with II3NeuAc-LacCer (GM3), II3NeuAcGgOse3Cer(GM2), II3NeuAcGgOse4Cer (GM1), II3NeuAc, IV3NeuAcGgOse4Cer (GD1a), II3(NeuAc)2GgOse3(GD2), II3(NeuAc)2GgOse4Cer (GD1b), IV3NeuAcII3(NeuAc)2, GgOse4Cer(GT1b), suggesting the binding epitope to be a terminal tetrasaccharide NeuAc alpha 2-8NeuAc alpha 2-3Gal beta 1-4(Glc or GlcNAc). DMAb-7 and DMAb-8 were used to investigate the expression of GD3 on cultured human tumor cells of neuroectodermal origin. Thirteen of 19 gliomas, 3 of 5 medulloblastomas, 5 of 5 neuroblastomas, 2 of 2 melanomas, and 1 of 3 teratomas were shown to react with DMAb-8 and/or DMAb-7 by cell surface-RIA (CS-RIA) and immunofluorescence (IF) assays. HPTLC and densitometric analysis confirmed these results, as positive immunostains in the GD3 region were obtained with oligoganglioside fractions from 9 glioma, 1 medulloblastoma, 2 neuroblastoma, 1 melanoma, and 1 teratoma cell line. Glioma cell line U-105 MG and medulloblastoma cell line Daoy contain GD3 as shown by HPTLC immunostain analysis of extracts, although GD3 was undetectable on the cell surface as determined by CS-RIA and IF.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Department of Pathology, Duke University Medical Center, Durham, NC 27710.
authors.forename: X
authors.initials: X
authors.lastname: He
authors.forename: C J
authors.initials: CJ
authors.lastname: Wikstrand
authors.forename: P
authors.initials: P
authors.lastname: Fredman
authors.forename: J E
authors.initials: JE
authors.lastname: Månsson
authors.forename: L
authors.initials: L
authors.lastname: Svennerholm
authors.forename: D D
authors.initials: DD
authors.lastname: Bigner
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D005260:Female; D005732:Gangliosides / Q000032:analysis*; D005910:Glioma / Q000032:analysis*; D008297:Male; D008527:Medulloblastoma / Q000032:analysis*; D008545:Melanoma / Q000032:analysis*; D051379:Mice; D008807:Mice, Inbred BALB C; D009447:Neuroblastoma / Q000032:analysis*; D011863:Radioimmunoassay; D014407:Tumor Cells, Cultured / Q000032:analysis*
chemical_list: D000911:Antibodies, Monoclonal; D005732:Gangliosides; C026226:ganglioside, GD3