A Two-Stage Immunoradiometric Assay with125I-Staphylococcal Protein A for the Detection of Antibodies and Complement on Human Blood Cells
- 1 April 1985
- journal article
- research article
- Published by Wiley in Vox Sanguinis
- Vol. 48 (4), 239-245
- https://doi.org/10.1111/j.1423-0410.1985.tb00178.x
Abstract
A sensitive two‐stage immunoradiometric assay (IRMA) using unlabeled specific antiglobulin sera followed by binding of radiolabeled staphylococcal protein A has been developed for detection of human IgG, IgM, IgA and complement C3 on human blood cells. In an experimental model system, purified human immunoglobulins (Ig) were coupled onto red blood cells, platelets, and leukocytes. The Ig‐coated red blood cells were analyzed in parallel by three methods: the radioimmune antiglobulin test with radiolabeled anti‐Ig; the radiolabeled staphylococcal protein A test, and the IRMA. Of the three methods evaluated, the latter was found to be sensitive and the easiest to perform. The applicability of the IRMA was established by investigating a group of 14 selected patients with autoimmune warm type hemolytic anemia. We observed that the IRMA detected cell‐bound antibodies (IgG and/or IgM) in several cases where conventional assays yielded negative results.This publication has 16 references indexed in Scilit:
- Deposition of the terminal C5b‐9 complement complex on erythrocytes by human red cell autoantibodiesBritish Journal of Haematology, 1983
- Platelet-associated complement C3 in thrombocytopenic statesBritish Journal of Haematology, 1983
- Detection of igg sensitization of red cells with 125I staphylococcal protein AAmerican Journal of Hematology, 1982
- Autoimmune Thrombocytopenia: Detection of Platelet Autoantibodies with the Suspension Immunofluorescence TestBritish Journal of Haematology, 1980
- Autoimmune Granulocytopenia: the Detection of Granulocyte Autoantibodies with the Immunofluorescence TestBritish Journal of Haematology, 1978
- Anti‐C3d Antiglobulin Reagents. II. Preparation of an Antiglobulin Serum Monospecific for C3dTransfusion, 1974
- Instrumented PVP‐Augmented Antiglobulin TestsVox Sanguinis, 1974
- The Autoimmune Haemolytic AnaemiasBritish Journal of Haematology, 1972
- The detection of cell-bound antibody on complement-coated human red cellsJCI Insight, 1970
- Efficient Trace-labelling of Proteins with IodineNature, 1958