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Updated: Aug 9, 2026

Identification and Characterization of Metastatic Factors by Gene Transfer into the Novel RIP-Tag; RIP-tva Murine Model
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Oncolysis of pancreatic tumour cells by a gamma34.5-deleted HSV-1 does not rely upon Ras-activation, but on the PI

F Sarinella1, A Calistri, P Sette

  • 1Department of Histology, Microbiology and Medical Biotechnologies, Section of Microbiology and Virology, Medical School, University of Padua, Padua, Italy.

Gene Therapy
|March 24, 2006
PubMed

Insights

Oncolytic viruses offer a promising cancer therapy. This study found that PI 3-kinase pathway dysregulation, not Ras signaling, enables replication-defective herpes simplex virus (HSV) to overcome antiviral defenses in pancreatic cancer cells.

Area of Science:

  • Oncology
  • Virology
  • Molecular Biology

Background:

  • Oncolysis, using viruses to destroy tumor cells, is a promising cancer therapy.
  • Pancreatic adenocarcinoma is aggressive and poorly responsive to conventional treatments.
  • Herpes simplex virus (HSV) shows oncolytic potential, particularly in Ras-overexpressing cells, common in pancreatic cancer.

Purpose of the Study:

  • To evaluate the potential of oncolytic viruses for pancreatic cancer treatment.
  • To investigate the role of Ras signaling and PKR activity in supporting herpes simplex virus replication in pancreatic cancer cells.
  • To identify cellular factors that permit replication of attenuated HSV-1 (R3616) in pancreatic cancer.

Main Methods:

  • Comparison of viral replication in four pancreatic cell lines with varying Ras signaling.
  • Assessment of viral permissiveness in relation to Ras pathway activation and PKR activity.
  • Investigation of the PI 3-kinase signaling pathway's role in viral replication.

Main Results:

  • Viral replication permissiveness in pancreatic cancer cells did not correlate with enhanced Ras signaling or defective PKR activity.
  • The PI 3-kinase signaling pathway was identified as a key factor enabling viral replication.
  • Dysregulation of the PI 3-kinase pathway allows the conditionally replication-defective R3616 HSV-1 strain to overcome cellular antiviral responses.

Conclusions:

  • Ras signaling and PKR activity are not the primary determinants of HSV replication in pancreatic cancer.
  • PI 3-kinase pathway dysregulation is crucial for overcoming cellular antiviral defenses and enabling oncolytic HSV replication in pancreatic cancer.
  • Targeting the PI 3-kinase pathway may enhance the efficacy of oncolytic herpes simplex virus therapy for pancreatic adenocarcinoma.

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