Effects of miR-145 on staurosporine-induced DNA fragmentation. LS174T cells (A), or normal colon cells (B) were transfected with the miR-145 mimic or siRNA-DFF45 (50 nM), and then exposed to staurosporine. DNA ladders in samples were collected at various times after treatment with staurosporine and visualized on a 1.5% agarose gel. After transfection with the miR-145 mimic or siRNA-DFF45, down-regulation of DFF45 protein was detected by Western blotting at 6, 12 and 18 hours in LS174T cells (C), but not in normal colon cells (E). Values in D and F are the means of three separate experiments ± SD. *, P < 0.05.