Fig. 3
From: Role of PM2.5 in the development and progression of COPD and its mechanisms
Effects of PM2.5 on the protein expression levels of MMPs, TGF-β1, fibronectin and collagen proteins. HBEs were incubated with PM2.5 with or without CSE for 24 h. The protein expression levels of MMPs, TGF-β1, fibronectin and collagens were detected by WB. a The protein expression of MMPs, TGF-β1, fibronectin and collagen induced by PM2.5 /CSE. b The protein expression levels of MMPs, TGF-β1, fibronectin and collagens induced by PM2.5 + CSE. * P < 0.05, ** P < 0.01, *** P < 0.001 vs control group; #P < 0.05, ## P < 0.01, ### P < 0.001 vs CSE group