Expression levels of plasma miRNA-21 and NT-proBNP in children with Kawasaki disease and their clinical significance

OBJECTIVE: The purpose of this study was to detect the expression levels of plasma microRNA-21 (miRNA-21) and NT-proBNP (N-terminal prohormone of brain natriuretic peptide) in children with Kawasaki disease (KD), as well as their clinical significance. PATIENTS AND METHODS: Children with KD (n=100) who were treated in our hospital from June 2017 to May 2019 were included. In the same period, non-KD children with febrile diseases were included as controls. Plasma levels of miRNA-21 and NT-proBNP were detected by reverse transcriptase-polymerase chain reaction (RT-PCR) and electrochemiluminescence. respectively. Then, the relationship between miRNA-21 and NT-proBNP in children with KD was analyzed by Pearson's correlation test. Potential factors influencing KD were analyzed by Multivariate logistic regression test. Finally. receiver operating characteristic (ROC) curves were depicted to assess the diagnostic potentials of miRNA-21 and NT-proBNP in KD. RESULTS: The results showed that miRNA-21 and NT-proBNP levels were higher in children with KD. Plasma level of miRNA-21 was positively correlated with NT-proBNP level in children with KD. Besides, both miRNA-21 and NT-proBNP were risk factors influencing the onset of KD. According to ROC curves, the sensitivity and specificity of miRNA-21 in diagnosing KD was 83% and 89%, respectively (AUC=0.9212. 95% CI: 0.8809-0.9614, cut-off value=1.985). NT-proBNP also displayed diagnostic potential in KD (AUC=0.9788, 95% CI: 0.9630-0.9946, cut-off value=265.6. sensitivity=88%, specificity=95%). CONCLUSIONS: MiRNA-21 and NT-proBNP are upregulated in plasma of children with KD. They are positively correlated with each other and serve as risk factors for KD. Both of them can be utilized as indicators of auxiliary diagnosis in KD.