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Natural killer cell receptors

E O Long1, N Wagtmann

  • 1Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, National Institutes of Health, 12441 Parklawn Drive, Rockville, Maryland, 20852, USA. elong@nih.gov

Current Opinion in Immunology
|June 1, 1997
PubMed
Summary
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Natural killer (NK) cells use inhibitory receptors to recognize target cells. Human NK cells utilize both killer cell inhibitory receptors (KIRs) and CD94-NKG2 receptors for MHC class I recognition, while mouse NK cells use Ly49 receptors.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Natural killer (NK) cells are crucial for innate immunity, primarily recognizing and eliminating target cells through inhibitory receptors.
  • The specificity of NK cell recognition is largely determined by interactions between NK cell receptors and Major Histocompatibility Complex (MHC) class I molecules on target cells.

Purpose of the Study:

  • To elucidate the diverse receptor families involved in the recognition of MHC class I molecules by NK cells in humans and mice.
  • To investigate the surprising finding that human NK cells employ distinct receptor types for MHC class I recognition.

Main Methods:

  • Comparative analysis of NK cell receptor repertoires in humans and mice.
  • Characterization of receptor domains (Ig vs. C-type lectin) and their association with ligand specificity.

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Main Results:

  • Human NK cells utilize two distinct receptor types for MHC class I recognition: killer cell inhibitory receptors (KIRs) with Ig domains and CD94-NKG2 receptors with C-type lectin domains.
  • Mouse NK cells primarily recognize MHC class I via C-type lectin Ly49 receptors.
  • Mouse NK cells also express a receptor related to KIR, but its ligand specificity remains undetermined.

Conclusions:

  • NK cell recognition of MHC class I molecules is achieved through diverse receptor families, highlighting evolutionary divergence between species.
  • The dual receptor system in humans (KIR and CD94-NKG2) for MHC class I recognition underscores the complexity of immune surveillance.