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Combined therapy with CTL cells and oncolytic adenovirus expressing IL-15-induced enhanced antitumor activity

Yang Yan1, Songyan Li, Tingting Jia

  • 1General Surgery Department, Chinese PLA General Hospital, 28 Fuxing Road, Haidian, Beijing, 100853, People's Republic of China.

Tumour Biology : the Journal of the International Society for Oncodevelopmental Biology and Medicine
|January 29, 2015
PubMed

Insights

This study developed an oncolytic adenovirus expressing interleukin-15 (IL-15) for enhanced tumor gene therapy. Combining this virus with cytotoxic T lymphocytes (CTL) significantly boosted antitumor effects compared to single treatments.

Area of Science:

  • Oncolytic virotherapy
  • Immunotherapy
  • Gene therapy

Background:

  • Cytokine Interleukin-15 (IL-15) has potential in cancer therapy but is underutilized.
  • Oncolytic adenoviruses are a promising tool for tumor gene therapy.

Purpose of the Study:

  • To construct and evaluate an oncolytic adenovirus engineered to express IL-15 for enhanced antitumor activity.
  • To investigate the synergistic effects of this modified adenovirus combined with cytotoxic T lymphocytes (CTL).

Main Methods:

  • Development of an E2F-1 promoter-driven oncolytic adenovirus (Ad-E2F) based on type 5 adenovirus.
  • Insertion of the human IL-15 gene into the E3 region of the adenovirus, creating Ad-E2F/IL15.
  • Combination therapy using Ad-E2F/IL15 with adoptive transfer of CTL in antitumor models.

Main Results:

  • Ad-E2F/IL15 demonstrated superior antitumor efficacy compared to the non-IL-15 expressing Ad-E2F.
  • IL-15 expression by the oncolytic virus activated natural killer (NK) and CD8(+) T cells.
  • The combination of Ad-E2F/IL15 and CTL significantly enhanced immune cell activity and tumor lysis.

Conclusions:

  • Engineered oncolytic adenovirus expressing IL-15 (Ad-E2F/IL15) offers a potent strategy for tumor gene therapy.
  • Combination therapy with Ad-E2F/IL15 and CTL presents a promising approach for enhanced cancer treatment.
  • This dual-action therapy holds potential as a novel tumor treatment modality.

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