Figure 7. CTCF promotes chemoresistance by regulating P53-Hedgehog axis signaling. (A) Apoptosis assays showed the effect of GDC0449 on CTCF-mediated 5-FU stimulated apoptosis of CRC cells. (B) Western blot analysis of the effects of P53 on CTCF-mediated ABCG2 upregulation. (C) The representative images of subcutaneous tumors from different experimental groups are shown. (D, E) Tumor weight and volume analyses showed that JK184 recovered the stimulative cell proliferation caused by upregulated CTCF under stimulation of 5-FU. (F) A hypothetical model illustrating that CTCF transcriptionally represses P53 and activates the Hedgehog signaling pathway to promote proliferation and 5-FU chemotherapy resistance of CRC cells. The above data are presented as mean ± SEM. * P<0.05, **P<0.01, and ***P<0.001.