Epithelial NLRP3 drives silica-induced lung injury and fibrosis through IL-18 and pro-fibrotic neutrophil recruitment

Silicosis — a devastating and incurable lung disease caused by inhaling silica dust — is surging worldwide, fuelled by a new wave of aggressive cases in young tradespeople working with engineered stone. Despite its growing impact, the biological triggers that turn silica exposure into life‑threatening lung inflammation and scarring have remained poorly understood.

Now, researchers at Hudson Institute of Medical Research have overturned decades of scientific assumptions, revealing that the structural cells lining the airways — not immune cells — are major instigators of silica‑induced lung damage. The discovery identifies a new therapeutic target for a disease that currently has no cure.

“This research fundamentally changes how we understand silicosis,” says Dr Maggie Lam, first author of the study. “For years, immune cells were thought to be the main culprits. But our work shows that the airway epithelium is actually a key driver of inflammation and fibrosis.”

Published in the international journal Particle and Fibre Toxicology, the study provides the strongest evidence yet that targeting the airway lining could halt disease progression — opening the door to precision therapies that could stop the disease before irreversible damage occurs.

References

Airway cells, not immune cells, trigger silicosis: new understanding of a deadly disease

6 July 2026

By Rob Clancy, staff writer. Reviewed by Dr Maggie Lam