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Autoantibodies in systemic lupus erythematosus
A R Cabral1, D Alarcón-Segovia
1Department of Immunology and Rheumatology, Instituto Nacional de la Nutrición Salvador Zubirán, México DF, México.
Current Opinion in Rheumatology
|October 6, 1997
Summary
Pathogenicity of anti-DNA antibodies is complex, influenced by fine specificities rather than just charge or affinity. Certain HLA haplotypes and autoantibodies are linked to systemic lupus erythematosus, with implications for diagnosis and autoimmune disease mechanisms.
Area of Science:
- Immunology
- Rheumatology
- Molecular Biology
Background:
- Pathogenicity of anti-DNA antibodies is not solely determined by charge or affinity for double-stranded DNA.
- Renal damage induced by anti-DNA antibodies may stem from subtle differences in antibody specificities.
- Understanding the mechanisms of autoantibody binding and cellular penetration is crucial for autoimmune disease research.
Purpose of the Study:
- To investigate the factors influencing the pathogenicity of anti-DNA antibodies.
- To explore the role of specific autoantibodies and genetic factors in systemic lupus erythematosus (SLE).
- To elucidate the mechanisms of autoantibody interaction with cells and their potential role in autoimmune disease pathogenesis.
Main Methods:
- Analysis of anti-DNA antibody properties, including charge and fine specificity.
- Investigation of monoclonal antibody penetration into live cells.
- Association studies of HLA haplotypes with specific autoantibodies in SLE patients.
- Evaluation of diagnostic utility of anti-Ro/Sjögren's syndrome antigen A antibodies.
- Characterization of antiphospholipid and anti-beta 2-glycoprotein-I antibodies.
Main Results:
- Charge and affinity for double-stranded DNA are insufficient predictors of antibody pathogenicity.
- Differences in fine specificities may explain anti-DNA-induced renal damage.
- Anti-U1 ribonucleoproteins can penetrate live cells and induce apoptosis.
- Specific HLA haplotypes (HLA-DRB1*1501/03, DQA1*0102, DQB1*0602) are associated with anti-ribosomal P antibodies in SLE.
- Anti-Ro/Sjögren's syndrome antigen A antibodies are valuable for diagnosing SLE in specific patient subgroups.
- True antiphospholipid antibodies have cationic residues in the H-chain CD3 region, unlike anti-beta 2-glycoprotein-I antibodies.
- IgG anti-beta 2-glycoprotein-I is associated with thrombosis in SLE.
- Apoptotic thymocytes bind antiphospholipid antibodies in a beta 2-glycoprotein-I-dependent manner.
Conclusions:
- Antibody fine specificity is critical for pathogenicity, impacting renal damage in SLE.
- Specific genetic and autoantibody profiles aid in SLE diagnosis and understanding disease mechanisms.
- Beta 2-glycoprotein-I plays a significant role in the binding of antiphospholipid antibodies to apoptotic cells, suggesting a mechanism for autoantigen presentation in autoimmune diseases.