FIGURE 5.
Differential EGFR phosphorylation profiles of cancer cells and their EVs in the presence or absence of PF-00299804 treatment. A431 cells and corresponding EV preparations were subjected to Western blotting for EGFR and for three different EGFR phosphosites (Tyr-845, Tyr-1068, and Tyr-1173). EVs differ in their EGFR phosphorylation profiles from their parental cells, including preponderance of 2 out of 3 phosphoisoforms of EGFR following drug treatment.