Lung epithelium

The lung epithelium is a specialized layer of cells lining the respiratory tract, serving as the primary interface between the external environment and the internal pulmonary system (StatPearls, 2023). It functions as a critical physical and biological barrier, utilizing mucociliary clearance and the secretion of antimicrobial substances to defend against inhaled pathogens and toxins (Nature Reviews Immunology, 2019). In the alveolar region, the epithelium is specialized for efficient gas exchange and produces pulmonary surfactant to maintain surface tension and prevent lung collapse (American Journal of Physiology, 2020). Dysregulation of the lung epithelium is central to the pathogenesis of chronic respiratory diseases like COPD, asthma, and cystic fibrosis, where epithelial-to-mesenchymal transition and barrier dysfunction occur (Lancet Respiratory Medicine, 2018). While the lung epithelium itself is a tissue rather than a single molecular target, it is the site of numerous therapeutic interventions (Journal of Clinical Investigation, 2021). Drugs targeting the epithelium typically act on specific proteins within these cells, such as the CFTR channel or various inflammatory signaling receptors, to restore homeostasis or alleviate symptoms.

Other names

Pulmonary epitheliumRespiratory epitheliumAirway epitheliumAlveolar epithelium

Pharmacological agents interact with specific molecular components within the lung epithelium, such as ion channels (e.g., CFTR), G protein-coupled receptors (e.g., ADRB2), and nuclear receptors (e.g., glucocorticoid receptors), to modulate cellular function, secretion, and inflammatory responses.