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Expression of TGF-β1 and Smad2 in normal and PQ-treated A549 cells following transfection with TGF-β1 shRNA. Lanes: 1, PQ-untreated negative control group; 2, PQ-untreated TGF-β1 shRNA group; 3, PQ + negative control group; 4, PQ + TGF-β1 shRNA group. Values are expressed as the mean ± standard deviation (n=4). *P<0.05 and #P<0.01 vs. negative control group. PQ, paraquat; Normal, PQ-untreated; shRNA, small hairpin RNA; TGF, transforming growth factor.
