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Paramyxoviruses for Tumor-targeted Immunomodulation: Design and Evaluation Ex Vivo
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Multimechanistic tumor targeted oncolytic virus overcomes resistance in brain tumors

Kaoru Tamura1, Hiroaki Wakimoto, Aayush S Agarwal

  • 1Molecular Neurotherapy and Imaging Laboratory, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts 02129, USA.

Molecular Therapy : the Journal of the American Society of Gene Therapy
|August 30, 2012
PubMed

Insights

This study developed a novel oncolytic herpes simplex virus (oHSV) carrying tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) to overcome cancer cell resistance. The engineered virus effectively targets resistant glioblastoma stem cells, inhibiting tumor growth and improving survival.

Area of Science:

  • Oncolytic virotherapy
  • Cancer stem cell biology
  • Molecular oncology

Background:

  • Limited patient response to oncolytic herpes simplex virus (oHSV) type-1 suggests tumor cell resistance.
  • Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) shows promise but faces resistance challenges.
  • Glioblastoma stem cells (GSCs) present a significant therapeutic challenge due to inherent resistance.

Purpose of the Study:

  • To engineer a recombinant oHSV expressing secretable TRAIL (oHSV-TRAIL) to overcome resistance in glioblastoma stem cells (GSCs).
  • To investigate the molecular mechanisms by which oHSV-TRAIL sensitizes resistant GSCs to apoptosis.
  • To evaluate the therapeutic efficacy of oHSV-TRAIL in preclinical models of glioblastoma.

Main Methods:

  • Identification and characterization of oHSV- and TRAIL-resistant GSC lines.
  • Construction and application of a recombinant oHSV encoding secretable TRAIL.
  • Analysis of MAPK signaling pathways (ERK, JNK, p38) and apoptosis-related caspases (caspase-8, -9, -3).
  • Assessment of tumor growth, invasiveness, and survival in mouse models bearing intracerebral tumors.

Main Results:

  • oHSV-TRAIL effectively downregulates ERK and upregulates JNK and p38 signaling in resistant GSCs.
  • This modulation primes resistant GSCs for apoptosis through caspase activation.
  • oHSV-TRAIL significantly inhibits tumor growth and invasiveness, prolonging survival in mice without harming normal tissues.

Conclusions:

  • oHSV-TRAIL represents a potent therapeutic strategy to overcome resistance in glioblastoma stem cells.
  • The combined action of oHSV and TRAIL offers a novel mechanism to sensitize resistant tumors to apoptosis.
  • This oncolytic virus platform holds potential for targeting a wide range of cancer types exhibiting therapeutic resistance.

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