Mucin Regulation in Airway Epithelial Biology

Airway epithelial mucins are high-molecular-weight glycoproteins that form the viscoelastic gel lining of the respiratory tract, playing a central role in barrier defences and mucociliary clearance. The two principal secreted mucins, MUC5AC and MUC5B, are produced by goblet cells and submucosal glands, respectively, and their balanced expression is essential for airway homeostasis. Mucin gene transcription and secretion are tightly regulated by a network of cytokines, growth factors and intracellular signalling cascades, notably epidermal growth factor receptor (EGFR)–mitogen-activated protein kinase (MAPK), nuclear factor-κB (NF-κB) and signal transducer and activator of transcription 6 (STAT6) pathways. In health, this regulatory machinery responds dynamically to inhaled particles and microbial insults; in disease, excessive mucin production and altered gel properties contribute to airway obstruction, as seen in asthma, chronic obstructive pulmonary disease, cystic fibrosis and chronic rhinosinusitis. Recent work has underscored the mechanistic links between allergic inflammation and mucin overproduction, revealed novel kinases and receptor interactions that fine-tune mucin gene expression, and highlighted opportunities for targeted pharmacological intervention to normalise mucus secretion without compromising host defence.

Research from Nature Portfolio

Recent studies have elucidated the causal role of Muc5ac in allergic airway hyperreactivity, demonstrating in murine models that genetic deletion of Muc5ac abolishes methacholine-induced airway constriction despite persistent inflammation, thereby establishing mucin plugging as a key effector of airflow limitation. Complementary work has identified the Src family kinase Lyn as a negative regulator of IL-4 and IL-13-driven MUC5AC overexpression; elevated Lyn activity suppresses STAT6 phosphorylation and its binding to the MUC5AC promoter, attenuating mucus hypersecretion and inflammatory cell infiltration in ovalbumin-challenged airways. Together, these findings position mucin glycoproteins and their upstream kinases as central determinants of airway reactivity and as promising targets for novel asthma therapies.

Mucin Regulation in Airway Epithelial Biology publication trend

The graph below shows the total number of articles in mucin regulation in airway epithelial biology across all publications each year (not limited to Nature Index journals).

Technical terms

Mucin: Gel-forming glycoprotein secreted by airway epithelial cells that contributes to mucus viscoelasticity.

Goblet cell: Specialized epithelial cell responsible for synthesizing and secreting mucins into airway lumen.

MUC5AC: Major secreted mucin expressed by airway goblet cells, often up-regulated in allergic and inflammatory lung diseases.

EGFR: Cell-surface receptor that activates MAPK signalling cascades to regulate mucin gene transcription.

STAT6: Transcription factor activated by type 2 cytokines (IL-4, IL-13) that drives MUC5AC overexpression.

NF-κB: Ubiquitous transcription factor mediating inflammatory responses and up-regulation of mucin genes.

Endotype: Disease subtype defined by distinct molecular or immunological mechanisms rather than clinical features.

References

1. Integrative Approach to Identifying System-Level Mechanisms of Chung-Sang-Bo-Ha-Hwan’s Influence on Respiratory Tract Diseases: A Network Pharmacological Analysis with Experimental Validation. Plants (2023).
2. Characteristics of mucin hypersecretion in different inflammatory patterns based on endotypes of chronic rhinosinusitis. Clinical and Translational Allergy (2024).
3. The polymeric mucin Muc5ac is required for allergic airway hyperreactivity. Nature Communications (2015).
4. Lyn regulates mucus secretion and MUC5AC via the STAT6 signaling pathway during allergic airway inflammation. Scientific Reports (2017).
5. Upregulation of MUC5AC by VEGF in human primary bronchial epithelial cells: implications for asthma. Respiratory Research (2019).