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Updated: Dec 18, 2025
Inducing Acute Lung Injury in Mice by Direct Intratracheal Lipopolysaccharide Instillation
Published on: July 6, 2019
MiR-520c-3p alleviates LPS-induced A549 cell and mice lung injury via targeting NLRC5
1Department of Pharmacy, People's Hospital of Changshou Chongqing, Chongqiong, China.
Abstract:
MicroRNAs (miRNAs) play important roles in the progression of acute lung injury (ALI). So far, little is known about the role of miR-520c-3p in ALI. In this study, the mechanism of the occurrence and development of ALI was explored. We firstly found that miR-520c-3p could inhibit the expression of NLRC5. A549 cells were treated with lipopolysaccharide (LPS) in vitro to simulate ALI cells and inducing ALI model mice. Moreover, miR-520c-3p overexpression enhanced the viability of damaged cells, inhibited LPS-induced apoptosis, and decreased LPS-induced IL-1β, IL-6 and TNF-α. In addition, the NLRC5 was a direct target of miR-520c-3p. And NLRC5 partially aggravated inflammation injury. In conclusion, miR-520c-3p alleviates LPS-induced inflammatory injury via regulating NLRC5.
Insights
MicroRNA 520c-3p (miR-520c-3p) alleviates acute lung injury (ALI) by inhibiting NLRC5. Overexpression of miR-520c-3p protects lung cells from lipopolysaccharide (LPS)-induced damage and inflammation.
Area of Science:
- Biochemistry
- Molecular Biology
- Immunology
Background:
- MicroRNAs (miRNAs) are crucial regulators in the pathogenesis of acute lung injury (ALI).
- The specific role of miR-520c-3p in ALI remains largely unexplored.
- Understanding miRNA involvement is key to developing novel therapeutic strategies for ALI.
Purpose of the Study:
- To investigate the functional role and underlying mechanism of miR-520c-3p in the development of ALI.
- To determine the relationship between miR-520c-3p and NLRC5 in the context of ALI.
- To explore the therapeutic potential of modulating miR-520c-3p in ALI.
Main Methods:
- In vitro cell culture models using A549 cells stimulated with lipopolysaccharide (LPS) to mimic ALI.
- In vivo experiments involving ALI model mice induced by LPS.
- Analysis of miR-520c-3p expression and its target gene, NLRC5.
- Assessment of cell viability, apoptosis, and inflammatory cytokine levels (IL-1β, IL-6, TNF-α).
Main Results:
- miR-520c-3p was found to directly inhibit the expression of NLRC5.
- Overexpression of miR-520c-3p improved the viability of LPS-induced damaged cells.
- miR-520c-3p significantly reduced LPS-induced apoptosis and suppressed the release of inflammatory cytokines (IL-1β, IL-6, TNF-α).
- NLRC5 was identified as a direct target of miR-520c-3p and was shown to partially aggravate inflammatory injury.
Conclusions:
- miR-520c-3p plays a protective role in ALI by targeting and downregulating NLRC5.
- Modulation of miR-520c-3p demonstrates potential as a therapeutic approach for mitigating LPS-induced inflammatory injury in ALI.
- The miR-520c-3p/NLRC5 axis is a critical pathway in the inflammatory response during ALI.
