The effects of TGF-β1 on IL-8 mRNA expression in HK-2 cells. (A) The effects of different dosages of TGF-β1 (0.5, 1, 2, 5, and 10 ng/mL) on IL-8 mRNA expression. (B) The effects of different durations of treatment with TGF-β1 (6, 12, 24, 36, 48 h) on IL-8 mRNA expression. bP<0.05 vs TGF-β1 control group.