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Published on: June 17, 2025
miR-16-5p Attenuated Airway Inflammation and Pulmonary Fibrosis of Asthma Rats by Regulating the TGF-β1/Smad3
Weiwei She1, Tianshou Sun1, Chengfeng Long1
1Department of Respiratory and Critical Care Medicine, Nanxishan Hospital of Guangxi Zhuang Autonomous Region, Guilin, China.
Abstract:
Bronchial asthma is a significant inflammatory disorder impacting the airways. While current therapeutic interventions manage these symptoms, they do not offer a cure for the condition. Emerging research indicates that specific microRNAs (miRNAs) are implicated in the pathogenesis of asthma and the associated airway remodeling. Notably, miR-16-5p has been identified as a regulator of TGF-β1-induced epithelial-mesenchymal transition (EMT) in bronchial epithelial cells. This study investigates the influence of miR-16-5p on pulmonary function, inflammation, and fibrosis in asthma, focusing on its interaction with the TGF-β1/Smad3 signaling pathway, using a rat model for experimental analysis. Male Sprague-Dawley rats were given ovalbumin (OVA) and aluminum hydroxide to create an asthma model. They were divided into six groups. miRNA treatments were delivered using PEG-liposomes before each asthma challenge for 8 weeks. Asthma rats had lower levels of miR-16-5p. Elevating miR-16-5p levels improved breathing, reduced inflammation, and prevented lung damage. miR-16-5p regulated the TGF-β1/Smad3 pathway by targeting Smad3, indicating its protective role against asthma. Increasing miR-16-5p levels can improve lung function, reduce inflammation, and prevent lung fibrosis in asthma rats by targeting Smad3 to block the TGF-β1/Smad3 pathway. This finding suggests that miR-16-5p has translational potential as a novel therapeutic target for asthma treatment, which could lead to more effective strategies for asthma management in the future.
Insights
Increasing microRNA-16-5p (miR-16-5p) levels can improve breathing and reduce lung inflammation and damage in asthma. This microRNA targets Smad3, offering a potential new therapeutic strategy for asthma management.
Area of Science:
- Pulmonary Medicine
- Molecular Biology
- Genetics
Background:
- Bronchial asthma is a chronic airway inflammatory disease with limited curative treatments.
- MicroRNAs (miRNAs) are increasingly recognized for their role in asthma pathogenesis and airway remodeling.
- miR-16-5p is implicated in regulating epithelial-mesenchymal transition (EMT) in airway cells.
Purpose of the Study:
- To investigate the role of miR-16-5p in pulmonary function, inflammation, and fibrosis in a rat asthma model.
- To explore the interaction between miR-16-5p and the TGF-β1/Smad3 signaling pathway in asthma.
- To assess the therapeutic potential of miR-16-5p for asthma treatment.
Main Methods:
- An experimental asthma model was established in male Sprague-Dawley rats using ovalbumin (OVA) and aluminum hydroxide.
- Rats were divided into six groups, receiving miRNA treatments via PEG-liposomes.
- Pulmonary function, inflammation, and lung damage were assessed over an 8-week treatment period.
Main Results:
- Asthma model rats exhibited significantly lower endogenous miR-16-5p levels.
- Restoration of miR-16-5p levels led to improved pulmonary function, reduced airway inflammation, and mitigated lung damage.
- miR-16-5p was found to target Smad3, effectively inhibiting the TGF-β1/Smad3 signaling pathway.
Conclusions:
- miR-16-5p plays a protective role in asthma by targeting Smad3 and modulating the TGF-β1/Smad3 pathway.
- Elevating miR-16-5p levels demonstrates therapeutic potential for improving lung function and reducing inflammation and fibrosis in asthma.
- miR-16-5p represents a promising novel therapeutic target for future asthma management strategies.
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Asthma is classified as allergic and non-allergic. Allergens such as dust mites, pollen, and pet dander trigger allergic asthma, while factors like cold air, intense emotions, or exercise can induce non-allergic asthma.