Figure 3. BUB1 inhibition reduces EGFR activation. MDA-MB-231 (A) NCI-H358 (B) and MRC5 (C) cells were serum starved and pre-treated with 10 μM 2OH-BNPP1 for 1 hour followed by 50 ng/mL EGF. Cells were harvested at the indicated time-points (10-180 minutes) after EGF treatment. Whole cell lysates from these samples were resolved on SDS-PAGE gels and transferred to PVDF membranes. The membranes were blocked with 5% de-fatted milk-TBST and probed with pEGFR (Y845), pAKT (S473), and pERK1/2 antibodies. The blots were also probed with antibodies raised against total proteins.