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ORIGINAL ARTICLE
Korean J Pediatr 2017 July;60(7) :208-215.
Published online 2017 July 15.       
Association of Toll-like receptor 2-positive monocytes with coronary artery lesions and treatment nonresponse in Kawasaki disease
Soo Jung Kang1, Nam Su Kim2
1Department of Pediatrics, CHA Bundang Medical Center, CHA University School of Medicine, CHA University, Seongnam, Korea
2Department of Pediatrics, Hanyang University Hospital, Hanyang University College of Medicine, Seoul, Korea
Corresponding Author: Soo Jung Kang ,Tel: +82-31-780-5230, Fax: +82-31-780-5239, Email: kittysooni@chamc.co.kr
Copyright © 2017 by The Korean Pediatric Society
ABSTRACT
Purpose: Activation of Toll-like receptor 2 (TLR2) present on circulating monocytes in patients with Kawasaki disease (KD) can lead to the production of proinflammatory cytokines and interleukin-10 (IL-10). We aimed to determine the association of the frequency of circulating TLR2+/ CD14+ monocytes (FTLR2%) with the outcomes of KD, as well as to compare FTLR2% to the usefulness of sIL-10.
Methods: The FTLR2% in patients with KD was measured by flow cytometry. Serum levels of IL-10 (sIL-10) were determined in 31 patients with KD before the initial treatment with intravenous immunoglobulin (IVIG) and in 21 febrile controls by using enzyme-linked immunosorbent assay. Patients were classified as having coronary artery lesions (CALs) based on the maximal internal diameters of the proximal right coronary artery and proximal left anterior descending coronary artery one month after the initial diagnosis.
Results: We found that FTLR2% greater than 92.62% predicted CALs with 80% sensitivity and 68.4% specificity, whereas FTLR2% more than 94.61% predicted IVIG resistance with 66.7% sensitivity and 71.4% specificity. Moreover, sIL-10 more than 15.52 pg/mL predicted CALs and IVIG resistance with 40% and 66.7% sensitivity, respectively, and 73.7% and 76.2% specificity, respectively.
Conclusion: We showed that measuring FTLR2% before the initial treatment could be useful in predicting CAL development with better sensitivity than sIL-10 and with results comparable to sIL-10 results for the prediction of IVIG resistance in patients with KD. However, further studies are necessary to validate FTLR2% as a marker of prognosis and severity of KD.
Keywords: Kawasaki disease | Immunoglobulins | Coronary arteries | Toll-like receptors | Interleukins
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