title: Characterization of two monoclonal antibodies against human tissue-type plasminogen activator.
abstract: A series of hybridoma clones, each producing monoclonal antibodies to human tissue-type plasminogen activator (t-PA), were prepared from mice by standard procedures. Two of these clones were selected for further study. One HI72A1, produced antibodies that bound to t-PA and strongly inhibited its activity, whereas another, LI72D1, produced antibodies that bound to t-PA but did not affect its activity. The specificity of these antibodies was assessed in immunoabsorption experiments. Both immunoprecipitated 125I-labeled t-PA, and both were specific since only t-PA was recognized in conditioned media collected from Bowes melanoma cells cultured in the presence of 3H-leucine. Neither antibody recognized urokinase. t-PA was desorbed from antibody HI72A1-Sepharose columns with 0.5 M NaCl, consistent with its relatively low association constant (Ka = 9.37 X 10(7) M-1). In contrast, a strong chaotropic agent (i.e., 2 M KI) was required to elute t-PA from antibody LI72D1 columns (Ka = 2.08 X 10(9) M-1). This latter high affinity antibody was employed to develop an immunoradiometric assay for t-PA having a sensitivity of 0.5 ng/ml.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology* / Q000302:isolation & purification; D000918:Antibody Specificity; D002460:Cell Line; D002999:Clone Cells / Q000276:immunology; D006801:Humans; D006825:Hybridomas / Q000276:immunology; D008545:Melanoma / Q000032:analysis; D051379:Mice; D008807:Mice, Inbred BALB C; D010960:Plasminogen Activators / Q000276:immunology* / Q000302:isolation & purification; D011863:Radioimmunoassay
chemical_list: D000911:Antibodies, Monoclonal; D010960:Plasminogen Activators