Diverse antigen specificity of erythrocyte-reactive monoclonal autoantibodies from NZB mice
| Autor: | G. G. de Sa Oliveira, Robert N. Barker, P. M. Lydyard, Shozo Izui, Christopher J. Elson, C. T. Ravirajan, Rizgar A. Mageed |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Erythrocytes
Erythrocytes/ immunology medicine.drug_class Immunoblotting Immunology ddc:616.07 Monoclonal antibody Autoantibodies/ immunology Epitope Mice Antigen Antibody Specificity Anion Exchange Protein 1 Erythrocyte Phospholipids/immunology medicine Animals Immunology and Allergy Mice Inbred NZB/ immunology Anion Exchange Protein 1 Erythrocyte/analysis Band 3 Phospholipids Autoantibodies Mice Inbred NZB biology Autoantibody Antibodies Monoclonal Original Articles Flow Cytometry Precipitin Precipitin Tests Molecular biology Monoclonal biology.protein Antibodies Monoclonal/ immunology Anemia Hemolytic Autoimmune Antibody Anemia Hemolytic Autoimmune/ immunology |
| Zdroj: | Clinical and Experimental Immunology, Vol. 105, No 2 (1996) pp. 313-320 |
| ISSN: | 1365-2249 0009-9104 |
| DOI: | 10.1046/j.1365-2249.1996.d01-772.x |
| Popis: | The specificities of a panel of erythrocyte-reactive MoAbs derived from NZB mice with autoimmune haemolytic anaemia (AIHA) were determined by immunoprecipitation and immunoblotting. Of the eight antibodies, two (IgG1 MoAb 105-2H and IgG2a MoAb 34-3C) immunoprecipitated a 105-kD component identified as the erythrocyte anion channel band 3. A similar band was also immunoprecipitated by the IgG2b MoAb 34-2B when used at relatively high concentrations, but none of the remaining hybridoma antibodies precipitated any labelled erythrocyte components. In immunoblotting experiments only 34-2B reacted with band 3, indicating that the epitope recognized by this MoAb is robust and differs from the determinant(s) recognized by 105-2H and 34-3C. The remaining MoAbs to react by immunoblotting were the IgM antibodies IE10 and 4C8, both of which bound to a doublet corresponding to band 4.1 from the internal erythrocyte membrane skeleton. Of the three MoAbs which gave negative results in immunoprecipitation and immunoblotting, the IgM antibodies 103-7E and 106-10E reacted poorly with intact erythrocytes by flow cytometry, but the IgG1 antibody 31-9D bound well. ELISAs demonstrated that all four IgM MoAbs are polyreactive, since they bound to histones from a panel of nuclear antigens, and additionally 103-7E reacted with phosphatidyl choline. It is concluded that band 3 is an important autoantigen in NZB AIHA. However, since 3/5 haemolytic MoAbs failed to precipitate this antigen, either these antibodies represent minor components of the total autoantibody response, or responses to diverse possibly non-protein surface antigens also contribute to the pathogenesis of the disease. |
| Databáze: | OpenAIRE |
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