title: Analysis of the binding of peanut agglutinin (PNA) to leukaemic cells and its relationship to T-cell differentiation.
abstract: Several leukaemias have been screened with a panel of monoclonal antibodies as well as fluoresceinated peanut lectin (FITC-PNA). Approximately 25% of T-acute lymphoblastic leukaemias (T-ALLs) were strongly positive with FITC-PNA. The staining distribution pattern did not correlate with any other monoclonal antibody used, although the phenotypes of the PNA+ T-ALLs were similar to those found on cortical thymocytes and probably reflect a more mature cellular phenotype within the T-ALL group. Some myeloid leukaemias were also PNA+ although the staining was generally weak. Several T-cell lines were examined and generally the TdT- lines showed strongest fluorescence after incubation with FITC-PNA. If these lines were induced to differentiate with 12-O-tetradecanoyl phorbol 13-acetate (TPA) they became PNA-. This was accompanied by an increase in cellular sialyl transferase activity, suggesting that one step in the differentiation process of "early' T cells is the terminal sialylation of existing oligosaccharide chains. Metabolic labelling of PNA+ T-cell lines with [35S]-methionine followed by detergent lysis and affinity chromatography on PNA-agarose showed that several bands of molecular weights 40-100,000 were bound to the column when examined by sodium dodecyl sulphate polyacrylamide gel electrophoresis. If TPA-treated cells were examined these bands were absent.
mesh_terms: D002454:Cell Differentiation / Q000187:drug effects; D002460:Cell Line; D002846:Chromatography, Affinity; D006801:Humans; D037102:Lectins / Q000378:metabolism*; D007938:Leukemia / Q000378:metabolism* / Q000473:pathology; D008214:Lymphocytes / Q000378:metabolism; D008856:Microscopy, Fluorescence; D019887:Peanut Agglutinin; D013601:T-Lymphocytes / Q000166:cytology* / Q000378:metabolism / Q000473:pathology; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology
chemical_list: D037102:Lectins; D019887:Peanut Agglutinin; D013755:Tetradecanoylphorbol Acetate