Rac1 is required for oncolytic NDV replication in human cancer cells and establishes a link between tumorigenesis and sensitivity to oncolytic virus

Oncogene
J PuhlmannR Beier

Abstract

Oncolytic Newcastle disease virus (NDV) replicates selectively in most human tumor cells but not in normal cells. The relationship between tumorigenesis and the selective susceptibility of most tumor cells to oncolytic NDV replication is poorly understood. A multistage skin carcinogenesis model derived from non-tumorigenic HaCaT cells was used to systematically investigate the molecular mechanisms involved in the oncolytic NDV-sensitivity associated with tumorigenic transformation. No significant differences in interferon signaling were observed between the virus-sensitive tumor cells and the virus-resistant non-tumorigenic parental cells. Oncogenic H-Ras, which had been used for tumorigenic transformation, was shown to be necessary for virus replication but was not sufficient to render cells susceptible to NDV replication. By using an siRNA screening approach to search for virus-sensitizing genes in the tumorigenic cells, we could identify the small GTPase Rac1 as an oncogenic protein that is essential for NDV replication and anchorage-independent growth in tumorigenic cells. Furthermore, Rac1 expression was sufficient to render non-tumorigenic cells susceptible to NDV replication and to oncolytic cytotoxicity. This study esta...Continue Reading

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