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Paramyxoviruses for Tumor-targeted Immunomodulation: Design and Evaluation Ex Vivo
12:42

Paramyxoviruses for Tumor-targeted Immunomodulation: Design and Evaluation Ex Vivo

Published on: January 7, 2019

Adenovirus targeting to HLA-A1/MAGE-A1-positive tumor cells by fusing a single-chain T-cell receptor with minor

J de Vrij1, T G Uil, S K van den Hengel

  • 1Department of Molecular Cell Biology, Leiden University Medical Center, Leiden, The Netherlands.

Gene Therapy
|March 8, 2008
PubMed

Insights

This study demonstrates a novel method for targeting adenovirus vectors to cancer cells. By incorporating a specific T-cell receptor into the adenovirus capsid, researchers enhanced gene therapy vector delivery to tumor cells expressing cancer-testis antigens.

Area of Science:

  • Oncolytic virotherapy
  • Gene therapy vector development
  • Immunology

Background:

  • Cancer-testis (CT) antigens are tumor-specific targets for cancer gene therapy.
  • Adenovirus vectors are promising for delivering therapeutic genes to cancer cells.
  • Targeting CT antigens requires specific molecular recognition mechanisms.

Purpose of the Study:

  • To engineer adenovirus type 5 (HAdV-5) vectors for targeted delivery to tumor cells.
  • To utilize single-chain T-cell receptors (scTCRs) for specific targeting of CT antigens.
  • To investigate the incorporation of scTCRs into the adenovirus capsid for enhanced transduction.

Main Methods:

  • Fusion of an anti-MAGE-A1 scTCR with adenovirus minor capsid protein IX (pIX).
  • Generation of pIX-gene-deleted HAdV-5 vectors expressing the pIX-scTCR fusion protein.
  • Propagation of engineered viruses on cells expressing the fusion protein.
  • Assessment of viral transduction efficiency on melanoma cell lines with varying HLA-A1/MAGE-A1 expression.

Main Results:

  • Engineered HAdV-5 vectors successfully incorporated the pIX-scTCR fusion protein into their capsids.
  • The modified viruses showed at least 10-fold higher transduction efficiency for HLA-A1/MAGE-A1 positive melanoma cells.
  • Transduction efficiency was dependent on the accessibility of HLA-A1 molecules and the presence of MAGE-A1 peptides.

Conclusions:

  • Adenovirus type 5 vectors can be effectively targeted to tumor cells expressing CT antigens using pIX-scTCR fusions.
  • This strategy provides a proof of principle for targeted oncolytic virotherapy.
  • The approach holds potential for improving the specificity and efficacy of cancer gene therapy.

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