title: Monoclonal antibodies against plasma protease inhibitors: I. Production and characterization of 23 monoclonal antibodies against human alpha 2-antiplasmin.
abstract: 23 hybridomas secreting monoclonal antibodies against human alpha 2-antiplasmin, the fast-acting inhibitor of plasmin present in plasma, have been produced by the cell-fusion technique. Isotyping of the monoclonal antibodies has revealed that 14 monoclonal antibodies belong to the class IgG1, 6 to the class IgG2a, and 3 to the class IgG2b. All light chains belong to the kappa group. The specificity and relative avidity of these monoclonals have been determined using an indirect enzyme-linked immunosorbent assay. 13 monoclonals exhibit a relatively high avidity for alpha 2-antiplasmin, 5 are of intermediate avidity, and 5 of low avidity. The epitope specificity of these 23 monoclonal antibodies, originating from a single mouse, have been examined in inhibition experiments. A group of 10 monoclonal antibodies exhibit a very similar inhibition pattern. Partial inhibition effects displayed by 10 other antibodies define partially overlapping antigenic regions. The binding of these antibodies seems to produce a conformational change in the alpha 2-antiplasmin molecule, reducing the binding of two other antibodies. The last antibody defines an independent epitope.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000096:biosynthesis* / Q000145:classification / Q000276:immunology; D000915:Antibody Affinity; D000918:Antibody Specificity; D002459:Cell Fusion; D000939:Epitopes; D006825:Hybridomas / Q000276:immunology; D007074:Immunoglobulin G / Q000276:immunology; D051379:Mice; D008815:Mice, Inbred Strains; D000979:alpha-2-Antiplasmin / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000939:Epitopes; D007074:Immunoglobulin G; D000979:alpha-2-Antiplasmin