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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-mediated gene transfer of pathogen-associated molecular patterns for cancer immunotherapy

C Tosch1, M Geist, C Ledoux

  • 1Molecular Immunology Department, Transgene, Strasbourg, France.

Cancer Gene Therapy
|October 25, 2008
PubMed

Insights

Adenoviral vectors expressing pathogen-associated molecular patterns (PAMPs) promote dendritic cell maturation and enhance anti-tumor immunity. These vectors show potential as immunoadjuvants for cancer immunotherapy, improving tumor rejection when combined with tumor antigen vaccines.

Area of Science:

  • Immunology
  • Oncology
  • Gene Therapy

Background:

  • Tumor-induced immune tolerance hinders effective cancer treatment.
  • Stimulating dendritic cells (DCs) within the tumor microenvironment can overcome this tolerance.
  • Pathogen-associated molecular patterns (PAMPs) are microbial molecules that activate immune cells via Toll-like receptors.

Purpose of the Study:

  • To evaluate the immunostimulatory properties of PAMPs expressed in tumor cells using adenoviral (Ad) vectors.
  • To assess the efficacy of Ad-PAMPs as standalone immunoadjuvants and as vaccine adjuvants in cancer models.

Main Methods:

  • In vitro co-culture of tumor cells transduced with Ad-PAMPs (flagellin, P40) and human monocyte-derived DCs.
  • In vitro mixed lymphocyte reactions (MLRs) to assess lymphocyte proliferation and IFN-gamma secretion.
  • In vivo studies using intratumoral injection of Ad-PAMPs in melanoma models and combination therapy with a tumor antigen vaccine.

Main Results:

  • Ad-PAMPs induced DC maturation in vitro.
  • Transduced tumor cells stimulated lymphocyte proliferation and IFN-gamma secretion in MLRs.
  • Intratumoral Ad-P40 administration transiently inhibited melanoma progression.
  • Combination therapy with Ad-MUC1 and Ad-PAMPs delayed tumor growth and improved rejection in a therapeutic vaccine setting.

Conclusions:

  • Adenoviral vectors expressing PAMPs can effectively stimulate anti-tumor immune responses.
  • Ad-PAMPs demonstrate potential as immunoadjuvants for cancer immunotherapy.
  • Combining Ad-PAMPs with tumor antigen vaccines enhances therapeutic efficacy.

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