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NKG2D function protects the host from tumor initiation.

Mark J Smyth1, Jeremy Swann, Erika Cretney

  • 1Cancer Immunology Program, Trescowthick Laboratories, Peter MacCallum Cancer Centre, East Melbourne, Victoria, Australia. mark.smyth@petermac.org

The Journal of Experimental Medicine
|September 1, 2005
PubMed
Summary
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The NKG2D receptor is crucial for controlling new tumor formation. Blocking NKG2D increases susceptibility to methylcholanthrene-induced fibrosarcoma, highlighting its role in early cancer protection.

Area of Science:

  • Immunology
  • Oncology
  • Cancer Research

Background:

  • The NKG2D receptor is known to control experimental tumor growth and metastasis.
  • Its role in host protection against de novo tumorigenesis has not been previously demonstrated.

Purpose of the Study:

  • To investigate the function of the NKG2D pathway in host protection against de novo tumor formation.
  • To determine the role of NKG2D in methylcholanthrene (MCA)-induced fibrosarcoma development.

Main Methods:

  • Neutralization of NKG2D in wild-type (WT) mice.
  • Analysis of tumor development in mice deficient for IFN-gamma or TNF-related apoptosis-inducing ligand (TRAIL).
  • Assessment of IL-12 therapy's efficacy in preventing sarcoma formation.

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Main Results:

  • Neutralizing NKG2D significantly enhanced susceptibility to MCA-induced fibrosarcoma in WT mice.
  • The NKG2D pathway was critical for protection mediated by IFN-gamma and TRAIL.
  • IL-12 therapy's anti-sarcoma effects were largely dependent on the NKG2D pathway.
  • Sarcomas from perforin-deficient mice showed NKG2D ligand expression (Rae-1) and were immunogenic in WT mice.

Conclusions:

  • The NKG2D pathway plays a significant role in early control and shaping of tumor formation.
  • NKG2D is essential for host defense against de novo tumorigenesis.