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Serum-free immunoglobulin E: A useful biomarker of atopy and type 2 asthma in adults with asthma

Woo, SD | Yang, EM | Jang, J  | Lee, Y  | Shin, YS  | Ye, YM  | Nam, SY | Lee, KW | Jang, MH | Park, HS
Annals of allergy, asthma & immunology, 127(1). : 109-115.e1, 2021
Journal Title
Annals of allergy, asthma & immunology
Background: It has been known that a high serum total immunoglobulin E (IgE) level is a predisposing factor of allergic asthma; however, there are considerable limitations to apply it in clinical practice. Objective: To determine the clinical significance of the serum-free IgE level in patients with adult asthma. Methods: We measured free IgE levels using our homemade enzyme-linked immunosorbent assay by applying a novel IgE TRAP protein (GI innovation, Seoul, Republic of Korea) in sera of adults with asthma (n = 116) compared with healthy controls (n = 32); enzyme-linked immunosorbent assay inhibition test was performed to validate its binding specificity. Associations between asthma-related clinical and laboratory parameters were analyzed. The diagnostic value and cutoff point for detecting atopy and type 2 asthma were determined using receiver operating characteristic curve analysis. Results: The serum-free IgE levels were significantly higher in adults with asthma than in healthy controls and were significantly associated with atopic status and type 2 asthma (all P <.001). In the receiver operating characteristic analysis, serum-free IgE had a significantly greater area under the curve (AUC) than serum total IgE for assessing asthma, especially type 2 asthma (AUC, 0.810 vs 0.743; P =.006 and AUC, 0.729 vs 0.572; P <.001). The optimal cutoff points for predicting atopy and type 2 asthma were 82.8 and 120.8 ng/mL, respectively. Conclusion: It is suggested that a higher serum-free IgE level may be a useful biomarker of atopy and type 2 asthma in adults with asthma.

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Journal Papers > School of Medicine / Graduate School of Medicine > Allergy
Ajou Authors
박, 해심  |  신, 유섭  |  예, 영민  |  이, 영수  |  장, 재혁
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