title: Purification of a major sialoglycoprotein (SGP140) on P12/Ichikawa cells and its expression on differentiated HL-60 cells.
abstract: SGP140 glycoprotein, a major cell surface sialoglycoprotein with an apparent m.w. of 140,000, was detected on the human T lymphoblastoid cell line P12/Ichikawa by labeling with periodate-tritiated sodium borohydride, followed by urea-sodium dodecyl sulfate-polyacrylamide gel electrophoresis and fluorography. Then SGP140 was purified from P12/Ichikawa cells for study of its biochemical character and its distribution in various cell lines. The purification was performed by 0.2% Triton X-100 solubilization from crude membranes, DEAE-Sephacel column chromatography, WGA-agarose column chromatography, Blue-Sepharose 6MB column chromatography, and Sephadex G-150 gel filtration. Antiserum raised against SGP140 was then prepared, and immunoprecipitation and membrane immunofluorescence assay were performed on various cell lines. SGP140 was detected on P12/Ichikawa, Raji, P3HR-1, Daudi, Namalva, BALL-1, MOLT-4B, TALL-1, NALL-1, and K562 cells, but was not detected on HL-60 cells. When HL-60 cells were treated with dimethyl sulfoxide, retinoic acid, or 12-O-tetradecanoylphorbol-13-acetate, SGP140 was detected on cell surfaces. We discuss the possibility that SGP140 may be a differentiation antigen.
mesh_terms: D000818:Animals; D000951:Antigens, Neoplasm / Q000032:analysis / Q000302:isolation & purification; D000954:Antigens, Surface / Q000032:analysis / Q000302:isolation & purification*; D002454:Cell Differentiation; D002460:Cell Line; D004591:Electrophoresis, Polyacrylamide Gel; D006801:Humans; D007945:Leukemia, Lymphoid / Q000276:immunology; D008223:Lymphoma / Q000276:immunology; D019038:Platelet Glycoprotein GPIb-IX Complex; D010980:Platelet Membrane Glycoproteins; D011817:Rabbits; D011956:Receptors, Cell Surface / Q000032:analysis; D012795:Sialoglycoproteins / Q000276:immunology / Q000302:isolation & purification* / Q000378:metabolism; D013601:T-Lymphocytes / Q000166:cytology / Q000276:immunology*
chemical_list: D000951:Antigens, Neoplasm; D000954:Antigens, Surface; D019038:Platelet Glycoprotein GPIb-IX Complex; D010980:Platelet Membrane Glycoproteins; D011956:Receptors, Cell Surface; D012795:Sialoglycoproteins; C032193:glycoprotein receptor GPIb-IX