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. 2004 Dec;6(6):611-23.
doi: 10.1016/j.ccr.2004.11.012.

Late viral RNA export, rather than p53 inactivation, determines ONYX-015 tumor selectivity

Clodagh C O'Shea  1 , Leisa Johnson, Bridget Bagus, Serah Choi, Cory Nicholas, Annie Shen, Larry Boyle, Kusum Pandey, Conrado Soria, John Kunich, Yuqiao Shen, Gaston Habets, Dave Ginzinger, Frank McCormick
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Free article

Late viral RNA export, rather than p53 inactivation, determines ONYX-015 tumor selectivity

Clodagh C O'Shea et al. Cancer Cell. 2004 Dec.
Free article

Abstract

ONYX-015 is an adenovirus that lacks the E1B-55K gene product for p53 degradation. Thus, ONYX-015 was conceived as an oncolytic virus that would selectively replicate in p53-defective tumor cells. Here we show that loss of E1B-55K leads to the induction, but not the activation, of p53 in ONYX-015-infected primary cells. We use a novel adenovirus mutant, ONYX-053, to demonstrate that loss of E1B-55K-mediated late viral RNA export, rather than p53 degradation, restricts ONYX-015 replication in primary cells. In contrast, we show that tumor cells that support ONYX-015 replication provide the RNA export function of E1B-55K. These data reveal that tumor cells have altered mechanisms for RNA export and resolve the controversial role of p53 in governing ONYX-015 oncolytic selectivity.

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