Abstract
Until now, carbohydrate antigens of human megakaryocytes have not been studied very extensively. For this reason, we investigated the staining pattern of 25 lectins and carbohydrate-specific monoclonal antibodies on paraffin-embedded trephine biopsies and acetone-fixed smears from patients with reactive and neoplastic bone marrow lesions. A biotin-streptavidin-alkaline phosphatase assay was used to visualize the binding of lectins or antibodies. Ulex europaeus agglutinin I (UEA-I) stained megakaryocytes in all cases tested. Monoclonal antibodies detecting fucosylated Lewis type 2 chain antigens (19-OLE, 12-4LE and LeuM1) were also reactive. Several lectins detecting backbone and core oligosaccharides [Helix pomatia agglutinin (HPA), peanut agglutinin (PNA), Erythrina cristagalli agglutinin (ECA), soybean agglutinin (SBA)] bound to megakaryocytes only after neuraminidase digestion. Moreover, we investigated human platelet lysates to gain some information about the carbohydrate residues of platelet glycoproteins which are synthesized by megakaryocytes. The carbohydrate expression of platelets showed striking similarities to that of megakaryocytes. Immunoblotting experiments revealed a strong binding of UEA-I, 19-OLE and 12-4LE to a band isographic to glycoprotein (gp) Ib. After desialylation of glycoproteins transblotted to nitrocellulose, ECA and PNA also reacted with a band of this molecular weight. Gp Ib is known to contain a mucin-like peptide core with a great number of potential O-glycosylation sites. Therefore, it is tempting to speculate that carbohydrate residues characterized in this study are involved in the complex biological interactions of gp Ib.
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Baldus, S.E., Thiele, J., Charles, A. et al. Carbohydrate antigens of human megakaryocytes and platelet glycoproteins: a comparative study. Histochemistry 102, 205–211 (1994). https://doi.org/10.1007/BF00268897
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DOI: https://doi.org/10.1007/BF00268897