Capillary electrophoresis-laser-induced fluorescence (CE-LIF)-based immunoassay for quantifying antibodies against cyclic citrullinated peptides
- Capillary electrophoresis-laser-induced fluorescence (CE-LIF)-based immunoassay for quantifying antibodies against cyclic citrullinated peptides
- 유영숙; 강민정; 누엔 탄 빈; 박민
- anti-CCP; CE-LIF; Immunoassay; RA diagnosis
- Issue Date
- VOL 143, NO 13-3147
- We developed an assay for diagnosing rheumatoid arthritis (RA) by capillary electrophoresis with the laser-induced fluorescence detection (CE-LIF) of antibodies against cyclic citrullinated peptides (CCPs) using fluorescein isothiocyanate-labeled F-CCP11A and F-CCP. The CCPs were incubated overnight with a purified antibody against CCP and then injected into the CE-LIF system to estimate complex concentration. The immunocomplexes and free peptides were separated within 5 min; the LOD and LOQ values of the immunoassay are 0.1 μg mL− 1 and 0.3 μg mL− 1, respectively. The calibration curves for the immunocomplex had a coefficient of determination of 0.98. The reproducibility of the CE-LIF based immunoassay when using F-CCP11A and F-CCP was less than 5% and the accuracy ranged between 89 and 103%. The applicability of the assay was evaluated using serum samples from RA patients and healthy control subjects. We found that the sensitivity and specificity for RA diagnosis were 100% and 83.3%, respectively, for F-CCP11A and 100% and 90%, respectively, for F-CCP. These results demonstrate that the CE-LIF method can be useful for quantitative immunoassay development.
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