MicroRNA (miR)-429 Promotes Inflammatory Injury by Targeting Kruppel-like Factor 4 (KLF4) in Neonatal Pneumonia

Author(s): Lan Zhang*, HuanLi Yan, Huiping Wang, Li Wang, Boling Bai, Yingjun Ma, Yingchun Tie, Zhaoxia Xi

Journal Name: Current Neurovascular Research

Volume 17 , Issue 1 , 2020

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Background: Neonatal pneumonia is a common disease in the neonatal period with a high incidence and death. This study aimed to investigate the molecular mechanism and effect of microRNA (miR)-429 in neonatal pneumonia.

Methods: The peripheral blood was collected from neonatal pneumonia and healthy patients, respectively. Human lung fibroblast WI-38 cells were treated with lipopolysaccharide (LPS) to establish neonatal pneumonia cell model. Then, the miR-429 expression was detected by quantitative real-time polymerase chain reaction (qRT-PCR). In addition, the relationship between miR- 429 and kruppel-like factor 4 (KLF4) was confirmed by dual luciferase reporter assay. Cell viability, the level of interleukin 6 (IL-6), IL-1β and tumor necrosis factor α (TNF-α) and apoptosis were measured by Cell Counting Kit-8 (CCK-8), enzyme linked immunosorbent assay (ELISA) and flow cytometry. Meanwhile, apoptosis and nuclear factor kappa-B (NF-κB) pathway related proteins expression were analyzed by western blot.

Results: MiR-429 expression level was increased in neonatal peripheral blood and LPS-stimulated WI-38 cells. Then, miR-429 overexpression increased apoptosis, the level of IL-6, IL-1β, TNF-α, Bax and cleaved caspase-3, while reduced cell viability in LPS-stimulated WI-38 cells. Besides, KLF4 was identified as the target gene of miR-429, and reversed the changes caused by miR-429 overexpression. Finally, miR-429 suppressor down-regulated p-NF-κB level in LPS-stimulated cells and KLF4 knockdown reversed these reductions.

Conclusion: MiR-429 promotes inflammatory injury, apoptosis and activates the NF-κB signaling pathway by targeting KLF4 in neonatal pneumonia, and then these results provide evidence for clinical diagnosis and treatment for neonatal pneumonia.

Keywords: Neonatal pneumonia, miR-429, kruppel-like factor 4 (KLF4), apoptosis, inflammatory injury, lipopolysaccharide (LPS).

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Year: 2020
Published on: 04 May, 2020
Page: [102 - 109]
Pages: 8
DOI: 10.2174/1567202617666200128143634
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