PMID- 33347836 OWN - NLM STAT- MEDLINE DCOM- 20211014 LR - 20220910 IS - 1678-4782 (Electronic) IS - 0021-7557 (Print) IS - 0021-7557 (Linking) VI - 97 IP - 5 DP - 2021 Sep-Oct TI - The critical function of miR-1323/Il6 axis in children with Mycoplasma pneumoniae pneumonia. PG - 552-558 LID - S0021-7557(20)30251-5 [pii] LID - 10.1016/j.jped.2020.11.004 [doi] AB - OBJECTIVE: Mycoplasma pneumoniae pneumonia (MPP) is a common respiratory infection in children. Tumor necrosis factor-alpha (TNF-alpha), interleukin-17 (IL-17), and IL-6 have correlation with Mycoplasma pneumoniae lung infection and MPP pathogenesis. METHOD: miRNAs participate in the pathogenesis of various diseases by regulating the development and differentiation of the immune cell. Blood was collected and total RNA was isolated. miRNA microarrays were performed to identify differentially expressed miRNAs in MPP patients. The levels of relative miRNAs and mRNAs were evaluated by qRT-PCR. RESULTS: There are 23 differentially expressed miRNAs in MPP children's plasma, 15 miRNAs had enhanced expression and 8 had depressed expression. MPP patients showed lower mir-1323 level in blood samples than healthy controls. MPP patients with pleural effusion had much higher Il6 and Il17a mRNA levels than those without pleural effusion. The expression level of Il6 had a negative correlation with miR-1323 level. In the human THP-1 cell line, the level of miR-1323 was significantly reduced through lipopolysaccharides treatment. In THP-1 cells, overexpression or silencing of miR-1323 significantly reduced or promoted Il6 expression. CONCLUSION: In conclusion, miR-1323 targets the mRNA of Il6 and inhibits the expression of Il6. The pathogenesis of MPP inhibits the expression of miR-1323 in macrophages, triggers the overexpression of Il6, and enhances inflammation response. CI - Copyright (c) 2020 Sociedade Brasileira de Pediatria. Published by Elsevier Editora Ltda. All rights reserved. FAU - Yin, Linlin AU - Yin L AD - Cangzhou Central Hospital, Department of Clinical Laboratory, Hebei, China. Electronic address: Yinlinlin818@163.com. FAU - Ma, Yajun AU - Ma Y AD - Tengzhou Central People's Hospital, Department of Clinical Laboratory, Shandong, China. FAU - Wang, Wenlong AU - Wang W AD - Cangzhou Central Hospital, Department of Clinical Laboratory, Hebei, China. FAU - Zhu, Yitang AU - Zhu Y AD - Cangzhou Central Hospital, Department of Clinical Laboratory, Hebei, China. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20201219 PL - Brazil TA - J Pediatr (Rio J) JT - Jornal de pediatria JID - 2985188R RN - 0 (MIRN1323 microRNA, human) RN - 0 (MicroRNAs) RN - 0 (Tumor Necrosis Factor-alpha) SB - IM MH - Child MH - Humans MH - Leukocyte Count MH - *MicroRNAs/genetics MH - Mycoplasma pneumoniae/genetics MH - *Pneumonia, Mycoplasma MH - Tumor Necrosis Factor-alpha PMC - PMC9432136 OTO - NOTNLM OT - Il6 OT - MPP OT - Macrophage OT - Mycoplasma pneumonia OT - miR-1323 EDAT- 2020/12/22 06:00 MHDA- 2021/10/15 06:00 PMCR- 2020/12/19 CRDT- 2020/12/21 20:10 PHST- 2020/08/19 00:00 [received] PHST- 2020/11/02 00:00 [revised] PHST- 2020/11/05 00:00 [accepted] PHST- 2020/12/22 06:00 [pubmed] PHST- 2021/10/15 06:00 [medline] PHST- 2020/12/21 20:10 [entrez] PHST- 2020/12/19 00:00 [pmc-release] AID - S0021-7557(20)30251-5 [pii] AID - 10.1016/j.jped.2020.11.004 [doi] PST - ppublish SO - J Pediatr (Rio J). 2021 Sep-Oct;97(5):552-558. doi: 10.1016/j.jped.2020.11.004. Epub 2020 Dec 19.