title: Monoclonal antibody directed to MHC class I antigen (Bra23/9): characterization and utilization for study of antigen expression in differentiation of U 937 cell line.
abstract: The monoclonal antibody Bra23/9 (IgG2a) elicited by a non-T, non-B ALL cell line (REH), reacted in microscopic immunofluorescence, enzyme-linked immunoassay (ELISA), complement-dependent cytotoxicity tests and immunocytofluorometric measurements with hemopoietic cell lines and peripheral blood lymphocytes, monocytes and granulocytes from healthy donors in a pattern characteristic for MHC class I antigens. Immunoprecipitation of lactoperoxidase radioiodinated cell surface proteins and surface sialoglycoproteins radiolabeled by sodium metaperiodate/tritiated sodium borohydride technique confirmed the structure gp44,p12 (consisting of a 44 kDa glycopeptide linked with a nonglycosylated 12 kDa peptide) typical for MHC class I antigen(s) as a structure recognized by the Bra23/9 monoclonal antibody. The increase of MHC class I antigen density (immunofluorescence intensity) induced by a phorbol ester (TPA) in monoblast U 937 lymphoma cell line was observed by immunocytofluorometry as a predominant tendency in several TPA-induction experiments, where a certain variability among individual experiments in TPA-induced MHC class I antigen alterations was observed.
authors.affiliation: Cancer Research Institute, Slovak Academy of Sciences, Bratislava, Czechoslovakia.
authors.forename: I
authors.initials: I
authors.lastname: Plesková
authors.forename: J
authors.initials: J
authors.lastname: Sedlák
authors.forename: J
authors.initials: J
authors.lastname: Duraj
authors.forename: R
authors.initials: R
authors.lastname: Festin
authors.forename: H
authors.initials: H
authors.lastname: Munozová
authors.forename: K
authors.initials: K
authors.lastname: Poláková
authors.forename: B
authors.initials: B
authors.lastname: Chorváth
mesh_terms: D000911:Antibodies, Monoclonal; D002454:Cell Differentiation; D002460:Cell Line; D004797:Enzyme-Linked Immunosorbent Assay; D005455:Fluorescent Antibody Technique; D005805:Genes, MHC Class I; D006680:HLA Antigens / Q000235:genetics* / Q000276:immunology; D006801:Humans
chemical_list: D000911:Antibodies, Monoclonal; D006680:HLA Antigens