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Role for Mucin-5AC in Upper and Lower Airway Pathogenesis in Mice
Hye-Youn Cho1, Soojung Park2, Laura Miller1
1Immunity, Inflammation and Disease Laboratory, 6857National Institute of Environmental Health Sciences, National Institutes of Health, NC, USA.
Toxicologic Pathology
|May 3, 2021
Summary
Mucin-5AC (MUC5AC) is crucial for protecting airways from injury. Its absence in mice worsened lung damage from bleomycin, RSV, and ozone, highlighting MUC5AC
Area of Science:
- Pulmonary Medicine
- Immunology
- Mucosal Biology
Background:
- Mucin-5AC (MUC5AC) is a major secreted mucin in the airways.
- Its specific role in airway injury and disease remains incompletely understood.
Purpose of the Study:
- To investigate the function of MUC5AC in airway protection using a MUC5AC-deficient mouse model.
- To assess the impact of MUC5AC deficiency on pulmonary fibrosis, viral infection, and toxic injury.
Main Methods:
- Comparison of MUC5AC-deficient (Muc5ac-/-) and wild-type (Muc5ac+/+) mice.
- Induction of pulmonary fibrosis using bleomycin.
- Infection with respiratory syncytial virus (RSV).
- Exposure to ozone toxicity.
Main Results:
- Muc5ac-/- mice exhibited significantly greater inflammation and fibrosis after bleomycin exposure.
- Airway RSV replication and associated lung injury were more severe in Muc5ac-/- mice.
- Ozone exposure led to more pronounced nasal airway injury and pulmonary changes in Muc5ac-/- mice.
- E-cadherin levels were lower in Muc5ac-/- lungs across different injury models.
Conclusions:
- MUC5AC is essential for acute phase airway injury protection.
- Compensatory mechanisms, including subepithelial gland hyperplasia and increased other mucins, may occur in MUC5AC-deficient airways.
