Detection of Autoantibodies for Extractable Nuclear Antigens by LG Immunoblot Kit.
- Author:
Jeong Don CHAE
1
;
Heung Bum OH
;
Chang Gun LEE
;
Bin YOO
;
Mi Jin SOHN
;
Seung Bum YOO
Author Information
1. Department of Clinical Pathology, University of Ulsan College of Medicine and Asan Medical Center, Seoul, Korea. hboh@www.amc.seoul.kr
- Publication Type:Original Article
- Keywords:
ENA;
LG ENA Immunoblot;
Double immunodiffusion;
EIA;
Western blot
- MeSH:
Antibodies;
Antigens, Nuclear*;
Autoantibodies*;
Blotting, Western;
Connective Tissue Diseases;
Diagnosis;
Enzyme-Linked Immunosorbent Assay;
Humans;
Immunoassay;
Sensitivity and Specificity;
Seoul
- From:Korean Journal of Clinical Pathology
2002;22(1):34-41
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
BACKGROUND: Identification of antibodies recognizing extractable nuclear antigens (ENAs) is use-ful in the diagnosis and characterization of a variety of connective tissue diseases. Recently, LG ENA Immunoblot (LGCI, Seoul, Korea) was introduced for detecting various autoantibodies to ENAs simultaneously. Performance of this kit was evaluated in this study. METHODS: Sera from 108 SLE patients and 103 RA patients were tested for the presence of spe-cific autoantibodies to ENAs by LG ENA Immunoblot and DID. Concordance rates in each autoan-tibody were obtained. After discordant results were resolved by EIA (ENA ELISA TEST SYSTEM, Zeus Scientific Inc., NJ, USA) and western blot (ANA Western Blot Immunoassay, IMMCO Diag-nostics Inc., NY, USA), sensitivity and specificity of LG ENA Immunoblot were evaluated. Between-day precision was also tested. RESULTS: Concordance rates in each autoantibody in two methods were as follows: anti-RNP (88.0%, 95/108; 100%, 103/103), anti-Sm (87.0%, 94/108; 97.1%, 100/103), anti-SSA (94.4%, 102/108; 99.0%, 102/103), anti-SSB (97.2%, 105/108; 98.1%, 101/103), anti-Scl70 (99.1%, 107/108; 100%, 103/103) in SLE and RA patients, respectively. Sensitivity and specificity of Immunoblot were 92.0% and 99.6% for anti-RNP, 100% and 99.6% for anti-Sm, 100% and 98.6% for anti-SSA, 90.0% and 98.5% for anti-SSB, and 100% and 100% for anti-Scl70, respectively. Between-day precisions were 100% in all anti-ENA antibodies. CONCLUSIONS: LG ENA Immunoblot showed good concordance rates with the conventional DID method and high sensitivity (>90%) and specificity (>98.5%) in detecting all kinds of anti-ENA autoantibodies. LG Immunoblot has another merit in that it can detect several autoantibodies simul-taneously. It is suggested that LG ENA Immunoblot can replace DID for anti-ENA detection without any problem.
