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Updated: May 16, 2026

Anti-Nuclear Antibody Screening Using HEp-2 Cells
Published on: June 23, 2014
Autoantibodies to Argonaute 2 (Su antigen)
Minoru Satoh1, Jason Y F Chan, Angela Ceribelli
1Department of Medicine, University of Florida, FL 32610-0221, USA. minoru.satoh@medicine.ufl.edu
Anti-Su antibodies target Argonaute 2 (Ago2), a key protein in microRNA regulation. While found in various rheumatic diseases, anti-Su/Ago2 lacks disease specificity and its clinical role requires further investigation.
Area of Science:
- Immunology
- Molecular Biology
- Rheumatology
Background:
- Anti-Su antibodies, known since the 1980s, are prevalent in systemic rheumatic diseases.
- Characterization was slow due to inconsistent reactivity in standard immunoassays.
- The target antigen was identified as Argonaute 2 (Ago2) in 2006.
Purpose of the Study:
- To review the identification and characteristics of anti-Su/Ago2 antibodies.
- To discuss the challenges in detecting anti-Su/Ago2 antibodies.
- To explore the prevalence and potential clinical significance of anti-Su/Ago2.
Main Methods:
- Review of historical data and recent findings on anti-Su antibodies.
- Identification of Argonaute 2 (Ago2) as the target antigen.
- Immunoprecipitation as the reliable method for anti-Su/Ago2 detection.
Main Results:
- Argonaute 2 (Ago2) is the confirmed target antigen for anti-Su antibodies.
- Immunoprecipitation is essential for reliable anti-Su/Ago2 detection due to native antigen preference.
- Anti-Su/Ago2 antibodies are present in 10-20% of patients with rheumatic diseases and in healthy individuals.
Conclusions:
- Anti-Su/Ago2 antibodies are not disease-specific, found across various rheumatic conditions.
- The precise clinical significance and production mechanisms of anti-Su/Ago2 remain to be elucidated.
- Further research is needed to clarify the role of anti-Su/Ago2 in rheumatic diseases.
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