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Antibodies to Sm and RNP. Prognosticators of disease involvement
Abstract:
The charts of 150 consecutive patients found to have antibodies to Sm, ribonucleoprotein (RNP), or both were examined to determine these antibodies' possible associations with certain clinical conditions as well as their diagnostic specificities. Patients with anti-Sm were more likely to have renal disease and antibodies to double-stranded DNA, single-stranded DNA, and nuclear protein than were patients with anti-RNP. No clinical associations were found for anti-RNP. Although most of the patients with antibodies to Sm, RNP, or both had systemic lupus erythematosus, some had other diagnoses, including cutaneous lupus, drug-induced lupus, rheumatoid arthritis, juvenile arthritis, mixed connective tissue disease, Raynaud's disease, progressive systemic sclerosis, miscellaneous rheumatic and nonrheumatic diseases, and undifferentiated connective tissue disease syndromes. These findings suggest that these antibodies may be associated with some diseases, but are not disease-specific.
Insights
Antibodies to Sm and ribonucleoprotein (RNP) can be associated with various autoimmune diseases, but they are not specific to any single condition. Anti-Sm antibodies showed links to renal disease, unlike anti-RNP antibodies.
Area of Science:
- Rheumatology
- Immunology
- Autoimmunity
Background:
- Antibodies to Sm and ribonucleoprotein (RNP) are common biomarkers in autoimmune rheumatic diseases.
- Understanding the clinical associations and diagnostic specificity of these antibodies is crucial for accurate diagnosis and patient management.
Purpose of the Study:
- To investigate the clinical associations and diagnostic specificities of antibodies to Sm and RNP in a cohort of 150 patients.
- To determine if anti-Sm and anti-RNP antibodies correlate with specific clinical conditions or other autoantibodies.
Main Methods:
- Retrospective chart review of 150 consecutive patients with detectable anti-Sm, anti-RNP, or both.
- Analysis of clinical diagnoses and presence of other autoantibodies, including anti-double-stranded DNA, anti-single-stranded DNA, and anti-nuclear protein.
Main Results:
- Patients with anti-Sm antibodies were more frequently associated with renal disease and other autoantibodies compared to patients with anti-RNP antibodies.
- No specific clinical associations were identified for anti-RNP antibodies.
- While most patients had systemic lupus erythematosus, a spectrum of other rheumatic and nonrheumatic conditions were observed.
Conclusions:
- Anti-Sm and anti-RNP antibodies are associated with a range of autoimmune diseases but lack disease specificity.
- These autoantibodies may serve as indicators for certain conditions, such as renal disease in the case of anti-Sm, but do not exclusively define a single diagnosis.