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Overcoming immunosuppression in the melanoma microenvironment induced by chronic inflammation

Viktor Umansky1, Alexandra Sevko2

  • 1Skin Cancer Unit (G300), German Cancer Research Center and University Hospital Mannheim, Im Neuenheimer Feld 280, 69120, Heidelberg, Germany. V.Umansky@dkfz-heidelberg.de.

Cancer Immunology, Immunotherapy : CII
|November 29, 2011
PubMed

Insights

Targeting chronic inflammation in melanoma may improve immunotherapy. Drugs like sildenafil or paclitaxel reduced immunosuppressive myeloid-derived suppressor cells (MDSC) and enhanced survival in mice, suggesting a new therapeutic strategy.

Area of Science:

  • Oncology
  • Immunology
  • Pharmacology

Background:

  • Malignant melanoma exhibits rapid progression and poor treatment response, despite its immunogenicity.
  • Chronic inflammation in the tumor microenvironment, characterized by leukocytes and soluble mediators, drives immunosuppression and cancer progression.
  • Myeloid-derived suppressor cells (MDSC) are enriched in melanoma and suppress tumor-reactive T cells.

Purpose of the Study:

  • To investigate the role of chronic inflammation and MDSC in melanoma progression.
  • To evaluate the therapeutic potential of targeting chronic inflammation using sildenafil or paclitaxel in a melanoma mouse model.

Main Methods:

  • Utilized a ret transgenic mouse melanoma model that mimics human melanoma.
  • Assessed levels of chronic inflammatory factors, MDSC populations, and T cell receptor zeta (TCR ζ)-chain expression.
  • Administered sildenafil or low-dose paclitaxel and monitored therapeutic effects, including survival and immune cell function.
  • Investigated the role of CD8 T cells by depleting them and observing the impact on drug efficacy.

Main Results:

  • Elevated chronic inflammatory factors and MDSC correlated with melanoma progression in tumors and lymph nodes.
  • MDSC accumulation was linked to decreased TCR ζ-chain expression in T cells, indicating immunosuppression.
  • Sildenafil or paclitaxel treatment reduced inflammatory mediators, decreased MDSC, and restored TCR ζ-chain expression.
  • Both drugs significantly increased survival in tumor-bearing mice, an effect abrogated by CD8 T-cell depletion.

Conclusions:

  • Inhibition of chronic inflammation in the melanoma tumor microenvironment is a promising strategy.
  • Targeting MDSC and inflammation with sildenafil or paclitaxel can enhance anti-tumor immunity and improve survival.
  • Combined approaches involving inflammation inhibition and immunotherapy may increase melanoma treatment efficacy.

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