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Strategies for target cell recognition by natural killer cells.

A Diefenbach1, D H Raulet

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Natural killer (NK) cell stimulation relies on receptor balance. The NKG2D receptor and its identified ligands, upregulated on stressed cells, represent a novel "induced-self" recognition strategy for immune attack.

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Area of Science:

  • Immunology
  • Cellular Biology
  • Molecular Recognition

Background:

  • Natural killer (NK) cell activity is governed by a delicate equilibrium of inhibitory and stimulatory receptors.
  • The precise interactions between stimulatory receptors and their corresponding ligands remain incompletely elucidated.
  • NKG2D, a key stimulatory receptor, is expressed across various immune cells including NK cells, activated CD8+ T cells, gammadelta T cells, and macrophages.

Purpose of the Study:

  • To investigate the poorly understood interactions of stimulatory receptors, particularly NKG2D, with their ligands.
  • To define the cellular ligands recognized by the NKG2D receptor.
  • To explore the potential of NKG2D-ligand interactions as a novel mechanism for immune system target cell recognition.

Main Methods:

  • Identification and characterization of cellular ligands for the NKG2D receptor.
  • Analysis of ligand expression patterns in different cellular contexts, including transformed and infected cells.
  • Comparative studies in both murine and human systems.

Main Results:

  • Four distinct families of NKG2D ligands have been identified in mice and humans.
  • These ligands share distant structural homology with MHC class I molecules.
  • Certain NKG2D ligands are significantly upregulated on transformed and infected cells, signaling these cells for immune system engagement.

Conclusions:

  • The identification of NKG2D ligands provides crucial insights into NK cell activation pathways.
  • Upregulation of these ligands on stressed cells suggests an 'induced-self' recognition mechanism.
  • NKG2D-mediated recognition of 'induced-self' ligands may represent a fundamental new strategy for immune surveillance and target cell elimination.