Fig. 7. The effects of ß-catenin siRNA on Wnt3a-induced ERK activation. NIH3T3 cells were either not transfected or transfected with ß-catenin siRNA for 48 hours. (A) Cells were either treated or not treated with 150 ng/ml recombinant Wnt3a for 30 minutes before harvesting. (B) Cells were treated with 100 µl Con-CM or Wnt3a-CM for 30 minutes before harvesting. Cell extracts were then prepared, and western blot analyses were performed.