title: Three monoclonal antibodies against human LFA-1 alpha and beta chains with different biological activities.
abstract: Three murine monoclonal antibodies (MAbs) directed against human lymphocyte function-associated antigen-1 (LFA-1, CD11a/CD18), designated as MAY.017, MAY.035, and MAY. 044, were newly generated. The hybridomas were screened for their ability to inhibit a phorbol ester-stimulated aggregation of Epstein-Barr virus-transformed B-lymphoblastoid cell line (B-LCL). The MAbs bound to peripheral blood leukocytes, T cell lines, B cell lines, and some of myeloid/monocytic lines, but not to B-LCL derived from a patient with leukocyte adhesion deficiency. MAY.035 immunoprecipitated a complex of proteins with molecular masses of 155 kDa and 95 kDa, while MAY.017 and MAY.044 did a complex of 130 kDa, 155 kDa and 95 kDa proteins. MAY.035 was shown as to recognize the alpha chain of LFA-1 (CD11a), and both MAY.017 and MAY.044 the beta chain of the beta 2 integrin family (CD18). All the three MAbs inhibited lymphocyte proliferative responses to mitogens or alloantigens. MAY.017 blocked cytolytic activity mediated by natural killer cells.
authors.affiliation: Department of Pediatrics, Tohoku University, Sendai.
authors.forename: Y
authors.initials: Y
authors.lastname: Ohashi
authors.forename: M
authors.initials: M
authors.lastname: Minegishi
authors.forename: S
authors.initials: S
authors.lastname: Tsuchiya
authors.forename: T
authors.initials: T
authors.lastname: Konno
mesh_terms: D000328:Adult; D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology / Q000302:isolation & purification / Q000494:pharmacology*; D001402:B-Lymphocytes / Q000276:immunology; D002460:Cell Line; D004591:Electrophoresis, Polyacrylamide Gel; D005260:Female; D005455:Fluorescent Antibody Technique; D004854:Herpesvirus 4, Human; D006801:Humans; D006825:Hybridomas / Q000378:metabolism; D066298:In Vitro Techniques; D007457:Iodine Radioisotopes; D007694:Killer Cells, Natural / Q000187:drug effects; D008213:Lymphocyte Activation / Q000187:drug effects; D007959:Lymphocyte Culture Test, Mixed; D016169:Lymphocyte Function-Associated Antigen-1 / Q000276:immunology* / Q000502:physiology; D051379:Mice; D008807:Mice, Inbred BALB C; D010703:Phorbol Esters / Q000494:pharmacology; D011233:Precipitin Tests; D016028:Receptors, Leukocyte-Adhesion / Q000378:metabolism
chemical_list: D000911:Antibodies, Monoclonal; D007457:Iodine Radioisotopes; D016169:Lymphocyte Function-Associated Antigen-1; D010703:Phorbol Esters; D016028:Receptors, Leukocyte-Adhesion