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Dok1 and Dok2 proteins regulate natural killer cell development and function

Javier Celis-Gutierrez1, Marilyn Boyron2, Thierry Walzer3

  • 1INSERM U1068 Centre de Recherche en Cancérologie de Marseille, Marseille, France Institut Paoli-Calmettes, Marseille, France CNRS UMR7258 Centre de Recherche en Cancérologie de Marseille, Marseille, France Aix-Marseille Université, Marseille, France.

The EMBO Journal
|June 26, 2014
PubMed

Insights

Dok1 and Dok2 proteins regulate natural killer (NK) cell activation. These molecules form a negative feedback loop, ensuring proper immune responses against tumors and microbes.

Area of Science:

  • Immunology
  • Cellular Biology
  • Molecular Signaling

Background:

  • Natural killer (NK) cells are crucial for innate immunity against viral infections and tumors.
  • NK cell activity is tightly regulated by activating and inhibitory signals to maintain immune homeostasis.
  • Intrinsic and extrinsic mechanisms control NK cell tolerance and effector functions.

Purpose of the Study:

  • To investigate the role of cytoplasmic signaling molecules Dok1 and Dok2 in NK cell regulation.
  • To elucidate the involvement of Dok1 and Dok2 in the signaling pathways downstream of NK cell-activating receptors.

Main Methods:

  • Analysis of Dok1 and Dok2 tyrosine phosphorylation in activated human NK cells.
  • Overexpression studies of Dok proteins in human NK cells.
  • Gene ablation studies in mice to assess NK cell maturation and function.

Main Results:

  • Dok1 and Dok2 undergo tyrosine phosphorylation following NK cell activation.
  • Increased expression of Dok1 and Dok2 inhibits NK cell activation mediated by activating receptors.
  • Genetic deletion of Dok1 and Dok2 in mice results in impaired NK cell maturation.
  • Dok1 and Dok2 deficiency leads to enhanced Interferon-gamma (IFN-γ) production in response to activating stimuli.

Conclusions:

  • Dok1 and Dok2 function as key negative regulators in NK cell signaling.
  • These proteins are involved in an intrinsic negative feedback mechanism downstream of NK cell-activating receptors.
  • Dok1 and Dok2 play conserved roles in regulating NK cell responses in both mice and humans.
Keywords:
Dok moleculesadaptor proteinscell signalingcytokine productionnatural killer cells

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