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Updated: May 10, 2026

Dissecting Innate Immune Signaling in Viral Evasion of Cytokine Production
08:32

Dissecting Innate Immune Signaling in Viral Evasion of Cytokine Production

Published on: March 2, 2014

Inflammatory cytokine-mediated evasion of virus-induced tumors from NK cell control

Rabinarayan Mishra1, Bojan Polic, Raymond M Welsh

  • 1Department of Pathology, University of Massachusetts Medical School, Worcester, MA 01655, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|June 18, 2013
PubMed

Insights

Murine polyomavirus (PyV) tumors evade natural killer (NK) cell attacks. Inflammatory cytokines produced by tumor-infiltrating macrophages downregulate RAE-1, preventing NK cell-mediated tumor destruction.

Area of Science:

  • Immunology
  • Virology
  • Oncology

Background:

  • DNA tumor virus infections, like polyomavirus (PyV), can cause tumors in immunocompromised individuals.
  • Murine polyomavirus (PyV)-infected mice serve as a model to study antiviral and antitumor immune responses.
  • Natural Killer (NK) cells are crucial for controlling viral infections and tumor development.

Purpose of the Study:

  • To investigate the mechanism by which PyV-induced tumors evade NK cell-mediated control.
  • To identify factors within the tumor microenvironment that affect NK cell function.
  • To understand the role of inflammatory cytokines in tumor immune evasion.

Main Methods:

  • In vitro cytotoxicity assays using PyV-induced tumor cells and NK cells.
  • Analysis of RAE-1 expression on tumor cells.
  • Detection and characterization of soluble factors produced by tumor tissues.
  • Identification of immune cells infiltrating PyV-induced tumors.

Main Results:

  • NK cells efficiently kill PyV-induced tumor cells in vitro via NKG2D-RAE-1 interaction.
  • In T cell-deficient mice, NK cells only delay tumor development.
  • PyV-induced tumors exhibit reduced surface RAE-1 expression.
  • Tumor tissues produce inflammatory cytokines (IL-1α, IL-1β, IL-33, TNF) that downregulate RAE-1.
  • Tumor-infiltrating macrophages produce IL-1β and TNF, contributing to RAE-1 downregulation.

Conclusions:

  • Tumor-infiltrating macrophages generate inflammatory cytokines within the tumor microenvironment.
  • These cytokines downregulate RAE-1 expression on tumor cells, enabling evasion of NK cell-mediated cytotoxicity.
  • This represents a novel mechanism of immune evasion in virus-induced tumors.

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