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Updated: Jan 22, 2026

Transarterial Administration of Oncolytic Viruses for Locoregional Therapy of Orthotopic HCC in Rats
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Overexpression of Smac by an Armed Vesicular Stomatitis Virus Overcomes Tumor Resistance

Weike Li1, Ravi Chakra Turaga2, Xin Li2

  • 1Department of Chemistry, Georgia State University, Atlanta, GA 30302, USA.

Molecular Therapy Oncolytics
|July 18, 2019
PubMed

Insights

This study introduces an armed oncolytic virus (VSV-S) that overcomes tumor resistance by enhancing Smac/DIABLO expression. VSV-S effectively induced apoptosis and significantly reduced tumor volume in preclinical models.

Area of Science:

  • Oncolytic virotherapy
  • Cancer biology
  • Molecular virology

Background:

  • Tumor resistance to oncolytic viruses (OVs) limits their clinical efficacy.
  • Endogenous Smac/DIABLO levels decrease during wild-type VSV infection, potentially contributing to resistance.

Purpose of the Study:

  • To engineer an oncolytic virus expressing Smac/DIABLO to overcome tumor resistance.
  • To evaluate the efficacy of the engineered virus in inducing apoptosis and reducing tumor growth.

Main Methods:

  • Construction of an armed vesicular stomatitis virus (VSV-S) expressing Smac/DIABLO.
  • Assessment of Smac/DIABLO levels in infected cells.
  • Evaluation of apoptosis induction by VSV-S and wild-type VSV (wtVSV).
  • Intratumoral injection of VSV-S into xenograft models (4T1 and T-47D cells).

Main Results:

  • VSV-S infection enhanced Smac/DIABLO levels compared to wtVSV infection.
  • VSV-S robustly induced apoptosis, whereas wtVSV did not.
  • Significant reduction in tumor volume was observed in mice treated with VSV-S.

Conclusions:

  • VSV-S represents a novel strategy to overcome oncolytic virus resistance in tumors.
  • Enhanced apoptosis mediated by VSV-S leads to improved tumor regression.
  • This armed oncolytic virus shows promise for enhanced cancer therapy.

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