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NK cell receptors

L L Lanier1

  • 1DNAX Research Institute of Molecular and Cellular Biology, Palo Alto, California 94304, USA. lanier@dnax.org

Annual Review of Immunology
|May 23, 1998
PubMed
Summary
This summary is machine-generated.

Natural killer (NK) cells use inhibitory receptors to recognize MHC class I, preventing self-attack. These receptors, including Ly49, CD94/NKG2, and KIR, signal through ITIM motifs to inhibit NK cell functions.

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Area of Science:

  • Immunology
  • Cellular signaling

Background:

  • Natural killer (NK) cells are crucial for innate immunity, distinguishing self from non-self.
  • NK cell effector functions are tightly regulated by activating and inhibitory receptor signals.
  • Inhibitory receptors recognizing MHC class I molecules are key for NK cell self-tolerance.

Purpose of the Study:

  • To elucidate the signaling pathways of inhibitory NK cell receptors.
  • To identify the molecular mechanisms underlying NK cell regulation by MHC class I recognition.
  • To explore the superfamily of inhibitory receptors involved in NK cell recognition.

Main Methods:

  • Analysis of inhibitory receptor families (Ly49, CD94/NKG2, KIR) and their interaction with MHC class I.
  • Investigation of intracellular signaling cascades, including ITIM motifs, tyrosine phosphorylation, and phosphatase recruitment (SHP-1, SHP-2).

Main Results:

  • Inhibitory NK cell receptors utilize conserved ITIM sequences for signal transduction.
  • Receptor activation leads to tyrosine phosphorylation and recruitment of SHP-1/SHP-2 phosphatases.
  • This signaling cascade inhibits NK cell-mediated cytotoxicity and cytokine production.

Conclusions:

  • Inhibitory NK cell receptors provide specificity through MHC class I recognition.
  • A common inhibitory signaling pathway involving ITIMs regulates NK cell effector functions.
  • These receptors may belong to a larger inhibitory receptor superfamily (IRS).