(a) Western blot analysis of biomarker modulation in the HCT116 cell line. HCT116 cells were treated with the indicated doses of inhibitors for 8 h (top) or 24 h (bottom), and protein cell extracts were resolved on SDS-PAGE gel. Filters were probed with the indicated antibodies. C, control; B, bortezomib (0.01 μM); T, thapsigargin (0.1 μM); Mg, MG132 (0.1 μM). 