Abstract
The ability of viruses to selectively target, replicate within, and destroy tumour cells without deleterious effects in normal cells (oncolysis), makes the use of viruses as an attractive tool for cancer treatment. Pancreatic adenocarcinoma, being insensitive to traditional therapy and having a rather poor prognosis, represents a suitable target to evaluate viral oncolysis as a novel therapeutic approach. Herpes simplex virus (HSV) has been reported to produce an oncolytic effect in cells overexpressing Ras. As Ras signalling is frequently aberrant in pancreatic cancer, we compared four pancreatic cell lines (which differ in the presence of mutated or wild-type ras) for their ability to support growth of γ34.5-replication attenuated HSV-1 (R3616). Our data show that permissiveness to viral replication is neither associated with enhanced Ras signalling nor with defective PKR activity. By contrast, we provide evidence that disregulation of the PI 3-kinase signalling pathway allows conditionally replication-defective R3616 virus to overcome the cellular antiviral activity.
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Acknowledgements
This work was supported by AIDS grants from the Istituto Superiore di Sanità (Rome-AIDS Projects no. 40F-57 to GP and 30F.39 to CP), the Fondazione Cassa di Risparmio di Padova e Rovigo, Regione Veneto, MIUR, FIRB and AIRC.
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Sarinella, F., Calistri, A., Sette, P. et al. Oncolysis of pancreatic tumour cells by a γ34.5-deleted HSV-1 does not rely upon Ras-activation, but on the PI 3-kinase pathway. Gene Ther 13, 1080–1087 (2006). https://doi.org/10.1038/sj.gt.3302770
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DOI: https://doi.org/10.1038/sj.gt.3302770
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