Platinum-based drugs disrupt STAT6-mediated suppression of immune responses against cancer in humans and mice

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Evaluation of Tumor-infiltrating Leukocyte Subsets in a Subcutaneous Tumor Model
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Evaluation of Tumor-infiltrating Leukocyte Subsets in a Subcutaneous Tumor Model

Published on: April 13, 2015

W Joost Lesterhuis1, Cornelis J A Punt, Stanleyson V Hato

  • 1Department of Medical Oncology, Radboud University Nijmegen Medical Centre and Nijmegen Centre for Molecular Life Sciences, Nijmegen, The Netherlands. w.lesterhuis@onco.umcn.nl

The Journal of Clinical Investigation
|July 19, 2011
PubMed

Insights

Platinum-based chemotherapy reduces PD-L2, a T cell inhibitory molecule, on tumor cells and DCs. This enhances T cell responses against cancer, offering new therapeutic strategies.

Area of Science:

  • Immunology
  • Oncology
  • Pharmacology

Background:

  • Tumor microenvironments suppress T cell-mediated antitumor immunity.
  • Current immunotherapies enhance antitumor immunity but lack direct cytotoxicity.

Purpose of the Study:

  • Investigate the impact of cytotoxic chemotherapy on immune inhibitory pathways.
  • Determine if platinum-based chemotherapeutics modulate T cell inhibitory molecules.

Main Methods:

  • Exposure of human dendritic cells (DCs) and tumor cells to platinum-based chemotherapeutics.
  • Analysis of programmed death receptor-ligand 2 (PD-L2) expression.
  • Assessment of T cell proliferation, cytokine secretion, and tumor cell recognition.
  • Investigation of STAT6's role in PD-L2 regulation.
  • Correlation of STAT6 expression with patient outcomes in head and neck cancer treated with cisplatin-based chemoradiation.

Main Results:

  • Platinum chemotherapeutics significantly reduced PD-L2 expression on human DCs and tumor cells.
  • PD-L2 downregulation enhanced antigen-specific T cell proliferation, Th1 cytokine secretion, and T cell-mediated tumor cell recognition.
  • STAT6 was identified as a key regulator controlling PD-L2 downregulation.
  • STAT6-expressing head and neck tumors showed improved recurrence-free survival after cisplatin-based chemoradiation.

Conclusions:

  • Platinum-based anticancer drugs possess dual action: enhancing DC immunostimulatory potential and reducing tumor cell immunosuppression.
  • Platinum-induced STAT6 modulation contributes to enhanced antitumor immunity.
  • These findings support combining platinum compounds with immunostimulatory agents for broader therapeutic applications in cancer treatment.

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