Figure 5From: Reovirus exerts potent oncolytic effects in head and neck cancer cell lines that are independent of signalling in the EGFR pathway Stimulation or inhibition of EGFR signalling does not affect reovirus cytotoxicity in Cal27 cells. Cells were treated for 1 hr with 200 nM epidermal growth factor (EGF), 400nM anti-EGFR antibody (ICR62), 1 μM Iressa or 100 μM Tyrphostin AG99 (Tyrp), then either lysed, resolved on 8% Precise Protein Gels and probed for total EGFR, phospho-Tyr1068 EGFR and GAPDH or α-tubulin as loading controls, or infected with reovirus at 1.9×109 TCID50/ml and assayed for cell survival by MTT at 96 hours post-infection. Reovirus was diluted as follows: 1:16000 (20%), 1:4000 (50%) and 1:500 (80%). A. EGF stimulation does not increase reoviral cytotoxicity. B, C, D. ICR62-, gefitinib- (Iressa) and Tyrphostin-mediated inhibition of EGFR did not inhibit reoviral cytotoxicity. Means are calculated from 3 independent experiments and error bars represent SEMs. E. Western blot analysis showing effect of EGF, ICR62, Gefitinib (Iressa) and Tyrphostin on EGFR signaling.Back to article page