Abstract
The aim of this study was to investigate the underlying mechanism of miR-9-5p in airway smooth muscle cells (ASMCs) of asthmatic mice. An asthmatic mouse model was established through the intraperitoneal injection of ovalbumin. Histopathological changes in lung tissues of asthmatic mice were observed using HE staining. ASMCs was identified using immunofluorescence staining and cell morphology. The mRNA expressions of miR-9-5p, KLF5, and IL-1β were measured using RT-qPCR. Additionally, CCK8 assay and flow cytometry were applied for ASMC proliferation and apoptosis, respectively. The protein levels of OPN, KLF5, and IL-1β were assessed using western blotting. The results showed that miR-9-5p was abnormally downregulated in lung tissues and ASMCs of asthmatic mice. Dual-Luciferase Reporter Assay and Chromatin immunoprecipitation confirmed that miR-9-5p targeted KLF5 that bounds to IL-1β promoter. Besides, miR-9-5p negatively regulated IL-1β mRNA and protein level via KLF5. Moreover, miR-9-5p was found to positively regulate ASMC apoptosis, negatively regulate ASMC proliferation and OPN protein expression, albeit with partial reversal by KLF5. Mechanistically, the regulation of ASMC proliferation and apoptosis by miR-9-5p is achieved by targeting KLF5/IL-1β axis.
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CX and HH designed the study, JZ wrote the paper, and all authors participated in the experiments, data analysis, and approved the paper.
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Supplementary file1 (TIF 121 kb) Supplementary figure 1. MiR-9-5p expression in peripheral blood from asthmatic patients and healthy people.
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Xu, C., Huang, H., Zou, H. et al. The miR-9-5p/KLF5/IL-1β Axis Regulates Airway Smooth Muscle Cell Proliferation and Apoptosis to Aggravate Airway Remodeling and Inflammation in Asthma. Biochem Genet (2024). https://doi.org/10.1007/s10528-023-10640-1
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DOI: https://doi.org/10.1007/s10528-023-10640-1