Figure 4. Ectopic expression of E-cadherin in sarcoma cells inhibits phospho-CREB levels.
A. A phospho-kinase array revealed that E-cadherin led to downregulation of phospho-CREB. B-C. E-cadherin-mediated phospho-CREB inhibition was verified by B. ELISAs and C. western blotting. D. Abrams canine osteosarcoma cells exhibited reduced phospho-CREB in E-cadherin over-expressing cells. E. QRT-PCR confirmed knockdown of CREB with two independent siRNAs. F. Western blotting to confirm knockdown of CREB in 143B cells. G. CREB knockdown led to a modest downregulation of 143B colony growth in soft agar.