title: Use of monoclonal antibodies in a radioimmunoassay for human transcortin.
abstract: We describe the production of monoclonal antibodies to human transcortin and their use in a radioimmunoassay (RIA). A high-affinity antibody (Ka = 4 X 10(10) L/mol) made possible a sensitive RIA for transcortin (detection limit = 0.23 ng per tube), whereas use of an antibody of moderate affinity (Ka = 5 X 10(8) L/mol) was more suitable for the routine measurement of transcortin in serum, only a 25-fold dilution of the sample being required instead of 1500-fold. The correlation was good between both RIAs (r = 0.959) and between each of the RIAs and radial immunodiffusion (r = 0.955 and 0.976 for the methods with high- and low-affinity antibody, respectively). Although monoclonal antibodies were used in the RIAs and polyclonal ones in the radial immunodiffusion procedure, similar values were obtained by all techniques.
mesh_terms: D000328:Adult; D000911:Antibodies, Monoclonal / Q000096:biosynthesis* / Q000276:immunology; D000915:Antibody Affinity; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D005779:Immunodiffusion; D007074:Immunoglobulin G / Q000096:biosynthesis; D008297:Male; D011247:Pregnancy; D011863:Radioimmunoassay / Q000379:methods*; D014156:Transcortin / Q000097:blood*
chemical_list: D000911:Antibodies, Monoclonal; D007074:Immunoglobulin G; D014156:Transcortin