An oncolytic virus is a promising strategy for glioblastoma (GBM) therapy. However, there are still some challenges such as the blood-brain barrier (BBB) and preexisting immunity for targeted treatment of GBM with an oncolytic virus. In this study, two kinds of cell membrane-coated oncolytic adenoviruses (NCM-Ad and GCM-Ad) were prepared using neural stem cells (NSCs) and GBM cells as sources of membranes, respectively, and were shown to improve the targeted infectivity on GBM cells and avoid the immune clearance of preexisting neutralizing antibodies in vitro and in vivo. Specifically, NCM-Ad showed a strong ability to cross the BBB and target tumor cells in vivo. To improve the cytotoxicity to GBM, a capsid dual-modified oncolytic adenovirus (A4/k37) was also encapsulated, and NCM-A4/k37 showed outstanding tumor targeting and inhibition capacity in an orthotopic xenograft tumor model of GBM upon intravenous administration. This study provides a promising oncolytic virus-based targeted therapeutic strategy for glioma.
Keywords: blood−brain barrier; glioblastoma; oncolytic adenovirus; preexisting immunity.