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Interleukin-10 reduces natural killer (NK) sensitivity of tumor cells by downregulating NK target structure

T Tsuruma1, A Yagihashi, K Hirata

  • 1Department of Surgery, Sapporo Medical University School of Medicine, Sapporo, 060-0061, Japan.

Cellular Immunology
|January 29, 2000
PubMed

Insights

Interleukin-10 (IL-10) reduces tumor cell sensitivity to natural killer (NK) cells by decreasing NK target structures (NKTS). This IL-10 effect on NKTS expression is more significant than MHC class I downregulation, aiding tumor immune evasion.

Area of Science:

  • Immunology
  • Cancer Biology
  • Molecular Biology

Background:

  • Natural killer (NK) cells are crucial for immune surveillance against tumors.
  • Tumor cells can evade NK cell-mediated cytotoxicity through various mechanisms.
  • Interleukin-10 (IL-10) is a cytokine with known immunomodulatory functions.

Purpose of the Study:

  • To investigate the impact of exogenous and endogenous IL-10 on NK cell cytotoxicity against rat tumor cells.
  • To determine the role of NK target structures (NKTS) in IL-10-mediated modulation of NK cell activity.
  • To compare the effect of IL-10 on NKTS expression versus MHC class I expression in tumor immune evasion.

Main Methods:

  • Treatment of rat W14 and W31 tumor cells with recombinant human IL-10.
  • Analysis of IL-10 effects on tumor cell proliferation and NKTS expression using monoclonal antibody (mAb) 109.
  • Examination of IL-10-transfected W31 cells (W31T-H and W31T-L) for endogenous IL-10 effects.
  • Assessment of NK cell-mediated cytotoxicity and inhibition by mAb 109.

Main Results:

  • Exogenous and endogenous IL-10 did not affect tumor cell proliferation.
  • Recombinant IL-10 dose-dependently decreased NKTS expression on tumor cells.
  • Tumor cells engineered to produce high levels of IL-10 (W31T-H) exhibited significantly reduced NKTS expression.
  • IL-10-mediated reduction in NKTS expression had a greater impact on NK cell susceptibility than previously observed MHC class I downregulation.

Conclusions:

  • IL-10 significantly downregulates NK target structure (NKTS) expression on tumor cells.
  • Reduced NKTS expression diminishes NK cell-mediated cytotoxicity, contributing to tumor immune escape.
  • IL-10-induced downregulation of NKTS represents a novel mechanism for tumor cells evading host immune surveillance.

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