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Updated: Oct 23, 2026
Murine Model of Allergen Induced Asthma
Published on: May 14, 2012
MicroRNA-221 Modulates Airway Remodeling via the PI3K/AKT Pathway in OVA-Induced Chronic Murine Asthma
Jing Pan1,2, Qianyuan Yang1,3, Yao Zhou1
1Department of Respiratory Medicine, Children's Hospital of Nanjing Medical University, Nanjing, China.
Background:
Airway remodeling is one of the most important pathological features of chronic asthma. This study aimed to determine whether microRNA-221 (hereafter, miR-221) can affect airway remodeling in a mouse model of ovalbumin (OVA)-induced chronic asthma.
Methods:
Adeno-associated viruses (AAVs) "Bearing miR-221 sponges" were used to downregulate miR-221 in asthmatic mice. Staining with hematoxylin and eosin (H&E), Masson trichrome, and periodic acid-Schiff reagent was used to assess histological changes. The affected signaling pathway in mouse airway smooth muscle cells (ASMCs) was also identified by gene chip technology. A PI3K/AKT-inhibitor (LY294002) was used to confirm the role of the pathway in ASMCs.
Results:
The inhibition of miR-221 in a murine asthma model was found to reduce airway hyper-responsiveness, mucus metaplasia, airway inflammation, and airway remodeling (p < 0.05). Furthermore, miR-221 was found to regulate collagen deposition in the extracellular matrix (ECM) of ASMCs. Bioinformatics analysis and western blot analysis confirmed that the PI3K-AKT pathway was involved in ECM deposition in ASMCs.
Conclusion:
miR-221 might play a crucial role in the mechanism of remodeling via the PI3K/AKT pathway in chronic asthma and it could be considered as a potential target for developing therapeutic strategies.
Insights
MicroRNA-221 inhibition reduces airway remodeling in asthma by regulating extracellular matrix deposition via the PI3K/AKT pathway. This suggests miR-221 as a potential therapeutic target for chronic asthma treatment.
Area of Science:
- Pulmonary Medicine
- Molecular Biology
- Cellular Signaling
Background:
- Airway remodeling is a key pathological feature in chronic asthma.
- MicroRNA-221 (miR-221) role in asthma-related airway remodeling requires investigation.
Purpose of the Study:
- To investigate the effect of miR-221 on airway remodeling in a mouse model of chronic asthma.
- To explore the underlying molecular mechanisms involving the PI3K/AKT pathway.
Main Methods:
- Adeno-associated viruses (AAVs) with miR-221 sponges were used to downregulate miR-221 in ovalbumin (OVA)-induced asthmatic mice.
- Histological analysis (H&E, Masson trichrome, PAS) assessed airway changes.
- Gene chip technology and PI3K/AKT inhibitor (LY294002) identified the PI3K/AKT pathway's role in airway smooth muscle cells (ASMCs).
Main Results:
- Inhibition of miR-221 significantly reduced airway hyper-responsiveness, mucus metaplasia, inflammation, and airway remodeling (p < 0.05).
- miR-221 was found to regulate collagen deposition in the extracellular matrix (ECM) of ASMCs.
- Bioinformatics and Western blot confirmed PI3K/AKT pathway involvement in ASMC ECM deposition.
Conclusions:
- miR-221 plays a critical role in chronic asthma remodeling through the PI3K/AKT pathway.
- Targeting miR-221 presents a potential therapeutic strategy for chronic asthma.
