Figure 5

TGF-β1-Smad2 pathway and miR-21 regulated each other.
Panel a, the effect of SB431542 on the miR-21 expression level in HaCaT cells irradiated with α-particles. * P < 0.05 compared with the relative control. Panel b, the effect of overexpression of miR-21 on the phosphorylation of Smad2 in HaCaT cells upon α-irradiation. Panel c, downregualtion of miR-21 in HaCaT cells alone induced phosphorylation of Smad2.