Melanoma (DM6, DM440), prostate (LNCaP, DU145), and breast cancer (MDA-MB231, SUM149) cell lines were infected with PVSRIPO at multiplicities of infection (MOIs) of 0.1 or 10. (A) Lysates were collected at the denoted hpi and tested by immunoblot for markers of direct viral cytotoxicity (eIF4G cleavage), host cell demise (PARP cleavage), viral translation (viral proteins P2/2BC/2C), and the innate antiviral response [p-eIF2α(S51)]. Global reduction of host (tubulin) and viral proteins at later time points reflects gross sample loss upon lytic destruction of cells. (B) Cells were infected (MOI=0.1) and harvested (48 hpi) for analysis of MHC class I and CD155 expression by flow cytometry (light gray, uninfected cells stained with isotype control; dark gray, uninfected cells stained for MHC or CD155; red, infected cells stained for MHC or CD155). All experiments were repeated twice, and representative results are shown.