Figure 2. MUC1-C is sufficient for activation of the TAK1→NF-κB pathway.
A. Lysates from HCT116 colon cancer cells transduced to stably express an empty vector or MUC1-C were immunoblotted with the indicated antibodies. B. TAK1 mRNA levels in the indicated HCT116 cells were determined by qRT-PCR (left). The results are expressed as relative TAK1 mRNA levels (mean±SD of three determinations) as compared to that obtained for the HCT116/vector cells (left). Lysates were immunoblotted with the indicated antibodies (right). C. Lysates from LoVo colon cancer cells transduced to stably express an empty vector or MUC1-C were immunoblotted with the indicated antibodies. D. The indicated LoVo cells were transfected with a TAK1 promoter-luciferase reporter (pTAK1-Luc) for 48 h and then assayed for luciferase activity. The results are expressed as the relative luciferase activity (mean±SD of three determinations) compared to that obtained for the LoVo/vector cells (left). qRT-PCR analysis of TAK1 mRNA in the indicated LoVo cells is expressed as relative levels (mean±SD of three determinations) as compared to that obtained for the LoVo/vector cells (right). E. Lysates from the LoVo/vector and LoVo/MUC1-C cells were immunoblotted with the indicated antibodies. F. The indicated LoVo cells were transfected with pGL4.32-Luc for 48 h and then assayed for luciferase activity. The results are expressed as the relative luciferase activity (mean±SD of three determinations) compared to that obtained for the LoVo cells.