Dysregulated ITGA3/FAK/YAP axis mediates impaired alveolar type II epithelial cells function in COPD

Area of Science:

• Pulmonary Medicine
• Regenerative Biology
• Molecular Mechanisms

Background:

• Alveolar regeneration deficiency contributes to emphysematous destruction in COPD.
• Alveolar type II epithelial (AT2) cell dysfunction is a key factor in impaired lung regeneration.
• Mechanisms underlying AT2 cell dysfunction in COPD remain poorly understood.

Purpose of the Study:

• To elucidate molecular mechanisms of impaired AT2 progenitor function in COPD.
• To understand regeneration defects in COPD using integrated omics and preclinical models.
• To identify novel therapeutic targets for COPD regeneration.

Main Methods:

• Established a chronic cigarette smoke (CS)-exposed murine model for emphysema evaluation.
• Utilized single-cell RNA sequencing (scRNA-seq) on patient and mouse AT2 cells.
• Performed functional validation and mechanistic investigation of ITGA3 using organoids and in vivo models.

Main Results:

• Chronic CS exposure impaired AT2 cell proliferation and self-renewal, linked to ITGA3 downregulation.
• The ITGA3/FAK/YAP axis was identified as critical for AT2 cell self-renewal post-injury.
• Reactive oxygen species (ROS) accumulation suppressed ITGA3, contributing to regenerative impairment; NAC treatment restored ITGA3 and improved pathology.

Conclusions:

• The ROS/ITGA3/FAK/YAP axis is a core regulator of AT2 cell renewal dysfunction in COPD.
• Targeting ROS and ITGA3 presents a promising therapeutic strategy for COPD regeneration.
• Integrated omics, preclinical models, and organoid studies elucidated key mechanisms in COPD lung regeneration.