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NK cells: tuned by peptide?

Jayajit Das1, Salim I Khakoo2

  • 1Battelle Center for Mathematical Medicine, The Research Institute at the Nationwide Children's Hospital and the Departments of Pediatrics and Physics, The Ohio State University, Columbus, OH, USA.

Immunological Reviews
|August 19, 2015
PubMed
Summary
This summary is machine-generated.

Natural killer (NK) cells use killer cell immunoglobulin-like receptors (KIRs) and CD94:NKG2 receptors to detect changes in major histocompatibility complex (MHC) class I ligands. These receptor systems have complementary roles in immune surveillance.

Keywords:
CD94KIRNKG2Anatural killer cellsviral infection

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Area of Science:

  • Immunology
  • Cellular Biology
  • Molecular Biology

Background:

  • Natural killer (NK) cells are crucial for innate immunity, recognizing target cells through various receptors.
  • Major histocompatibility complex (MHC) class I molecules present peptides to NK cell receptors, influencing immune responses.
  • Killer cell immunoglobulin-like receptors (KIRs) and CD94:NKG2 receptors are key NK cell receptors interacting with MHC class I ligands.

Purpose of the Study:

  • To investigate the peptide-dependent binding and functional consequences of KIR and CD94:NKG2 receptor interactions with MHC class I ligands.
  • To elucidate the complementary roles of these two receptor-ligand systems in sensing alterations in MHC class I expression.

Main Methods:

  • Analysis of peptide-dependent interactions between NK cell receptors (KIRs, CD94:NKG2) and their MHC class I ligands (e.g., HLA-E, HLA-C).
  • Evaluation of how specific peptides influence the signaling pathways of these receptor-ligand pairs.

Main Results:

  • Both KIR and CD94:NKG2 receptor binding to MHC class I is peptide-dependent, retaining evolutionary peptide selectivity.
  • Non-inhibitory peptides binding to HLA-E augment CD94:NKG2A-mediated inhibition, while those binding to HLA-C antagonize KIR2DL2/3-mediated inhibition.
  • NKG2A-positive NK cells are more sensitive to MHC class I downregulation than KIRs.

Conclusions:

  • The KIR and CD94:NKG2 receptor systems exhibit distinct yet complementary functions in recognizing changes in MHC class I.
  • These systems contribute to NK cell-mediated immune surveillance by responding differentially to peptide variations and MHC downregulation.