Objective: To investigate the expression of serum miR-16 in children with Mycoplasma pneumoniae pneumonia(MPP) and its effect on the immunity of Mycoplasma pneumoniae. Methods: From January 2020 to March 2021, children with MPP admitted to our hospital were selected as study group, including 90 cases in the acute stage and 110 cases in recovery. In addition, 100 healthy children were recruited as control group during the same period. The expression levels of miR-16, tumor necrosis factor-α(TNF-α), interleukin(IL)-8, IL-10, IL-13, immunoglobulin(Ig) G, IgA, complement(C3, CH50) and T lymphocyte subsets(CD3+, CD4+, CD8+, CD4+/CD8+) were detected. Receiver operating characteristic(ROC) curve was used to determine the diagnostic value of miR-16 for MPP. Results: The level of serum miR-16 decreased in MPP children compared with the control group(P<0.05). The serum level of miR-16 in acute MPP patients was also lower than that in recovery(P<0.05). Spearman rank correlation analysis showed that serum miR-16 was negatively correlated with the levels of TNF-α, IL-8, complement C3 and CH50 in all children with MPP or in the acute stage group(all r<0, P<0.05), and positively correlated with IL-10, IgG, IgA, CD4+/CD8+(all r>0, P<0.05). However, only serum IL-8, IgG and complement C3 levels were related to serum miR-16 levels in those in recovery(P<0.05). According to ROC curve analysis, the area under the curve(AUC) of serum miR-16 for MPP diagnosis was 0.758(95%CI:0.687-0.829, P<0.05), and the AUC of serum miR-16 for distinguishing between acute and recovery stage MPP was 0.784(95%CI:0.732-0.837, P<0.05). Conclusion: Serum miR-16 in children with MPP generally decreases, and the low level of serum miR-16 may reflect the state of inflammation and immune disorder in children with acute stage. |
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