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J. Biol. Chem., Vol. 263, Issue 21, 10186-10191, 07, 1988
BA Macher, J Buehler, P Scudder, W Knapp and T Feizi
Department of Chemistry, San Francisco State University, California 94132.
A mouse monoclonal antibody, VIM-2, specific for human blood cells of myelomonocytic lineage, was found to bind to a series of minor gangliosides isolated from the cells of patients with chronic myelogenous leukemia (Uemura, K., Macher, B.A., DeGregorio, M., Scudder, P., Buehler, J., Knapp, W., and Feizi, T. (1985) Biochim. Biophys. Acta 846, 26-36). TLC immunostaining studies with the VIM-2 antibody of gangliosides from normal human neutrophils, acute myeloid leukemia, and chronic myelogenous leukemia cells showed that the total amount and the ratio of the VIM-2 gangliosides varies among these different myeloid cells and appears to be related to the level of cellular differentiation. Purification of these gangliosides from chronic myelogenous leukemia cells was aided by a sensitive enzyme- linked immunosorbent assay procedure used in conjunction with high performance liquid chromatography. Structures for two of the immunoreactive gangliosides (a ceramide decasaccharide, VIII3NeuAcV3- Fuc-nLc8Cer and a ceramide dodecasaccharide X3-NeuAcVII3Fuc-nLc10Cer) are proposed from negative ion fast atom bombardment mass spectrometry of the native gangliosides, methylation analysis, and the combined use of glycosidase treatment and TLC immunostaining with carbohydrate sequence specific antibodies. The VIM-2 antigen was thus characterized as involving the sialofucooligosaccharide sequence.
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