Wang S, Cao F, Gu X, Chen J, Xu R, Huang Y, Ying L. LncRNA XIST, as a ceRNA of miR-204, aggravates lipopolysaccharide-induced acute respiratory distress syndrome in mice by upregulating IRF2.
INTERNATIONAL JOURNAL OF CLINICAL AND EXPERIMENTAL PATHOLOGY 2019;
12:2425-2434. [PMID:
31934069 PMCID:
PMC6949564]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Accepted: 05/22/2019] [Indexed: 06/10/2023]
Abstract
BACKGROUND
Acute respiratory distress syndrome (ARDS) is a common clinical syndrome with high a mortality rate, which is associated with diffuse alveolar injury and capillary endothelial damage. In recent years, numerous studies have been performed to explore the roles of long non-coding RNAs (lncRNAs) in various diseases in which lncRNA serves as a microRNA (miRNA) sponge to regulate targeted gene expression. However, whether lncRNAs participate in ARDS progression remains unclear.
MATERIALS/METHODS
The dual-luciferase reporter assay was employed to identify the interaction between lncRNA XIST and miR-204, as well as the correlation between miR-204 and interferon regulatory factor 2 (IRF2). Then, PaO2/FiO2 was determined in lipopolysaccharide (LPS)-induced ARDS. In addition, the concentrations of cytokines, including IFN-γ, IL-6, IL-17, TNF-α, IL-1β, and IL-6R were analyzed by ELISA. lncRNA XIST, miR-204, and IRF2 levels were determined by qRT-PCR assay, and the IRF2 expression was evaluated by western blot. Furthermore, levels of inflammation and conditions of alveoli were evaluated by hematoxylin (H&E)-staining in LPS-induced ARDS.
RESULTS
Our findings indicated that lncRNA XIST served as a sponge for miR-204. miR-204 directly regulated IRF2, andlncRNA XIST upregulated IRF2 expression by targeting miR-204. LncRNA XIST and miR-204 inhibitors significantly decreased the PaO2/FiO2 ratio, whereas miR-204 and silencing of IRF2 significantly increased the PaO2/FiO2 ratio in LPS-induced ARDS. In addition, lncRNA XIST and miR-204 inhibitors significantly increased levels of IFN-γ, IL-6, IL-17, TNF-α, IL-1β, and IL-6R, whereas miR-204 and silencing of IRF2 dramatically decreased related cytokines in LPS-induced ARDS. Furthermore, we demonstrated that lncRNA XIST and miR-204 inhibitors aggravated inflammatory cell infiltration, alveolitis, and the degree of fibrosis, whereas miR-204 and silencing of IRF2 alleviated inflammation and conditions of the alveoli.
CONCLUSION
In this study, we verified that lncRNA XIST serves as a sponge for miR-204 to aggravate LPS-induced ARDS in mice by upregulating IRF2.
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