PM2.5 Induced the Expression of Fibrogenic Mediators via HMGB1-RAGE Signaling in Human Airway Epithelial Cells

Abstract EN

Background.

The aim of the present study was to test whether fine particulate matter (PM2.5) induces the expression of platelet-derived growth factor-AB (PDGF-AB), PDGF-BB, and transforming growth factor-β1 (TGF-β1) in human bronchial epithelial cells (HBECs) in vitro via high-mobility group box 1 (HMGB1) receptor for advanced glycation end products (RAGE) signaling.

Methods.

Sprague-Dawley rats were exposed to motor vehicle exhaust (MVE) or clean air.

HBECs were either transfected with a small interfering RNA (siRNA) targeting HMGB1 or incubated with anti-RAGE antibodies and subsequently stimulated with PM2.5.

Results.

The expression of HMGB1 and RAGE was elevated in MVE-treated rats compared with untreated rats, and PM2.5 increased the secretion of HMGB1 and upregulated RAGE expression and the translocation of nuclear factor κB (NF-κB) into the nucleus of HBECs.

This activation was accompanied by an increase in the expression of PDGF-AB, PDGF-BB, and TGF-β1.

The HMGB1 siRNA prevented these effects.

Anti-RAGE antibodies attenuated the activation of NF-κB and decreased the secretion of TGF-β1, PDGF-AB, and PDGF-BB from HBECs.

Conclusion.

PM2.5 induces the expression of TGF-β1, PDGF-AB, and PDGF-BB in vitro via HMGB1-RAGE signaling, suggesting that this pathway may contribute to the airway remodeling observed in patients with COPD.