A, Cells were stimulated with HB-EGF (50 ng/mL), IGF-1 (20 ng/mL), or IGF-2 (50 ng/mL) for 48 h in the absence or presence of AH6809/GW627368X (5 μM each) pretreatment for 3 h and cell growth was measured using the MTT assay. The A550 values for untreated cells were assigned as 100% and the relative percentages for the treated cells are shown. Columns, mean percentages (n = 6); bars, SD. B, BxPC-3 cells were stimulated with HB-EGF (50 ng/mL), IGF-1 (20 ng/mL) and IGF-2 (50 ng/mL) for 20 min in the absence or presence of AH6809/GW627368X (5 μM each) pretreatment for 3 h. The levels of phosphorylated MEK, total MEK, phosphorylated ERK, and total ERK were determined by immunoblotting. The relative levels of phospho-MEK and -ERK were calculated using ImageJ software.