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In Vivo Immunogenicity Screening of Tumor-Derived Extracellular Vesicles by Flow Cytometry of Splenic T Cells
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Published on: September 23, 2021

Intrinsic sensor of oncogenic transformation induces a signal for innate immunosurveillance

Arun M Unni1, Tanya Bondar, Ruslan Medzhitov

  • 1Howard Hughes Medical Institute and Department of Immunobiology, Yale University School of Medicine, New Haven, CT 06520, USA.

Proceedings of the National Academy of Sciences of the United States of America
|January 29, 2008
PubMed

Insights

Cancer cells express NKG2D ligands during early tumorigenesis, signaling oncogenic transformation. This discovery reveals a key step in carcinogenesis and a potential target for cancer therapies.

Area of Science:

  • Immunology
  • Oncology
  • Molecular Biology

Background:

  • Metazoans possess intrinsic tumor-suppressor pathways to resist oncogenic transformation.
  • Vertebrates may utilize cytotoxic leukocytes, like natural killer (NK) cells, for cancer cell elimination, requiring cancer cells to be distinguishable from normal cells.
  • NKG2D ligands are expressed on tumor cell lines and some primary tumors, but their induction during in vivo oncogenic transformation is unclear.

Purpose of the Study:

  • To investigate whether NKG2D ligand expression is induced by oncogenic transformation in vivo.
  • To explore the role of c-Myc in regulating NKG2D ligands during tumorigenesis.

Main Methods:

  • Utilized a murine model of lymphomagenesis to study spontaneously arising tumors.
  • Analyzed the expression of NKG2D ligands during tumor development.
  • Investigated the involvement of c-Myc in NKG2D ligand regulation.

Main Results:

  • NKG2D ligands are induced on spontaneously arising tumors in a murine lymphomagenesis model.
  • c-Myc plays a role in the regulation of NKG2D ligand expression.
  • NKG2D ligand induction occurs at an early stage of tumorigenesis, coinciding with the acquisition of cancer-specific genetic lesions.

Conclusions:

  • NKG2D ligand induction represents an early event in tumorigenesis, potentially serving as an intrinsic mechanism for sensing oncogenic transformation.
  • This finding suggests a critical step in carcinogenesis where cancer cells become recognizable to NK cells.
  • The regulation of NKG2D ligands by c-Myc highlights a molecular link between oncogene activation and immune surveillance.

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