Sialylated glycolipid antigens on human leukemic cell lines.

Abstract:

:Many granulocyte-specific mouse monoclonal antibodies recognize the carbohydrate sequence 3-fucosyllactosamine, Ga 1 beta 1-4[Fuc alpha 1-3]GlcNAc, which occurs in cell-surface glycolipids and glycoproteins. In general, these antibodies bind to blast cells from most patients with acute myeloblastic leukemia, but not to those with acute lymphocytic leukemia. Neuraminidase treatment, however, increases exposure of this antigen on both myeloid and lymphoid cells. In the present study, the glycolipids from 13 lymphoid and nonlymphoid human cell lines were examined for the presence of unsialylated and sialylated 3-fucosyllactosamine sequences using a thin-layer chromatography immunostaining method. Nine of the cell lines were also tested by indirect immunofluorescence both before and after neuraminidase treatment. None of the six B-cell and T-cell lines had detectable neutral or sialylated glycolipid antigen. In contrast, six out of seven and five out of seven nonlymphoid cell lines had neutral and sialylated glycolipid antigens, respectively. These results agreed, in general, with those found by indirect immunofluorescence. They also represent the first direct demonstration of these sialylated glycolipids on human leukemic cells. Thus, in some cases increased antibody binding to neuraminidase-treated cells can be explained by the presence of sialylated glycolipid antigen.

journal_name

Exp Hematol

journal_title

Experimental hematology

authors

Spitalnik SL,Spitalnik PF,Civin CI,Ball ED,Schwartz JF,Ginsburg V

subject

Has Abstract

pub_date

1986-08-01 00:00:00

pages

643-7

issue

7

eissn

0301-472X

issn

1873-2399

journal_volume

14

pub_type

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