Industrial PM_2.5 cause pulmonary adverse effect through RhoA/ROCK pathway

Area of Science:

• Environmental Health
• Toxicology
• Pulmonary Medicine

Background:

• Industrial pollution is a leading cause of death in China.
• The mechanisms of fine particulate matter (PM2.5) health effects are unclear.
• PM2.5 exposure causes oxidative damage, inflammation, and lung epithelial barrier dysfunction.

Purpose of the Study:

• To elucidate the molecular mechanisms of PM2.5-induced pulmonary effects.
• To investigate the role of the RhoA/ROCK pathway in PM2.5 toxicity.
• To evaluate the therapeutic potential of ROCK inhibition.

Main Methods:

• BEAS-2B lung epithelial cells treated with organic and water-soluble PM2.5 extracts.
• Assessment of cytotoxicity, oxidative damage, and inflammatory response.
• Co-culture model with macrophages to study cell recruitment.

Main Results:

• Water-soluble PM2.5 extracts showed greater cytotoxicity than organic extracts.
• Both extracts activated the RhoA/ROCK and NF-κB pathways.
• ROCK inhibitor Y-27632 attenuated PM2.5-induced inflammation, barrier dysfunction, and macrophage adhesion.

Conclusions:

• PM2.5 induces pulmonary adverse effects through RhoA/ROCK-dependent NF-κB activation.
• ROCK pathway inhibition may be a therapeutic strategy for PM2.5-induced lung diseases.