Fig. 8

STEAP4 and 50 μM Copper co-treatment downregulates indicated cell cycle genes in Hep G2 cells. A STEAP4 with copper reductase activity reduces PLK1, CDK1, CDC20, CDC25C, and CCNB2 mRNA expression in Hep G2 cells. This synergistic effect is abolished by STEAP4 knockdown via siRNA. * p < 0.05, ** p < 0.01. B STEAP4 with copper reductase activity reduces PLK1, CDK1, CDC20, CDC25C, and CCNB2 protein expression in Hep G2 cells as indicated by representative western blot results