title: Quantitative comparison of Rh1 (Rho, D) antigen on D, Du and d red cells by radioimmunoassay using 125I-protein A.
abstract: Relative Rh1 (Rho, D) antigen contents of the red Rh: 1 (Rh positive, D), Rh: wl (Rh variant, Du) and Rh: -1 (Rh negative, d) cells were estimated from the quantity of 125I-protein A bound to the sensitized red cells. The isotope binding activity to both D and Du cells decreased in parallel with the dilution of anti-D serum. The relative amount of the 125I-protein A bound to Du cells was about one-sixth that of D cells without papain treatment, while no isotope binding was observed in d cells. The Du red cells were quantitatively deficient in Rh1 (Rho, D) antigen activity compared with the D cells. A radioimmunoassay using 125I-protein A was a very useful method for studies regarding measuring the relative amounts of various blood group antigens.
mesh_terms: D004910:Erythrocyte Membrane / Q000276:immunology*; D014644:Genetic Variation; D006801:Humans; D007457:Iodine Radioisotopes; D011863:Radioimmunoassay / Q000379:methods; D012204:Rh-Hr Blood-Group System / Q000032:analysis*; D013205:Staphylococcal Protein A
chemical_list: D007457:Iodine Radioisotopes; D012204:Rh-Hr Blood-Group System; C026410:Rho(D) antigen; D013205:Staphylococcal Protein A