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Mucin 1 deficiency mediates corticosteroid insensitivity in asthma
Javier Milara1,2,3, Anselm Morell4, Alfredo de Diego5
1Department of Pharmacology, Faculty of Medicine, Jaume I University, Valencia, Spain.
Allergy
|July 7, 2018
Summary
Mucin 1 (MUC1) expression is reduced in severe asthma, impacting corticosteroid effectiveness. Restoring MUC1 may improve treatment outcomes for patients with severe, uncontrolled asthma.
Area of Science:
- Immunology
- Respiratory Medicine
- Molecular Biology
Background:
- Loss of corticosteroid efficacy is a significant challenge in managing severe asthma.
- Mucin 1 (MUC1) is known to influence corticosteroid efficacy in chronic rhinosinusitis, but its role in severe asthma remains unclear.
Purpose of the Study:
- To investigate the role of Mucin 1 (MUC1) in corticosteroid efficacy in patients with severe asthma.
- To explore MUC1 expression in relation to asthma severity and corticosteroid response.
Main Methods:
- Quantitative real-time PCR and ELISA were used to measure Mucin 1 (MUC1) expression and inflammatory markers in human bronchial epithelial cells and neutrophils from asthma patients and healthy controls.
- An ovalbumin-induced asthma model in Mucin 1 (MUC1) knockout and wild-type mice was employed to assess in vivo effects.
Main Results:
- Mucin 1 (MUC1)-CT expression was significantly lower in severe asthma patients compared to mild asthma and healthy individuals.
- Inhaled corticosteroid (ICS) dosage inversely correlated with Mucin 1 (MUC1) expression.
- Dexamethasone demonstrated reduced anti-inflammatory effects in severe asthma cells, associated with altered Glucocorticoid Receptor (GR)-α phosphorylation and Mucin 1 (MUC1)-CT/GRα complex formation.
- MUC1 knockout mice exhibited resistance to the anti-inflammatory effects of dexamethasone.
Conclusions:
- Mucin 1 (MUC1)-CT plays a crucial role in modulating corticosteroid efficacy in asthma.
- Findings suggest Mucin 1 (MUC1) as a potential therapeutic target to restore corticosteroid sensitivity in severe asthma.
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