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Flow Cytometry-based Assay for the Monitoring of NK Cell Functions
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Published on: October 30, 2016

Peroxisome proliferator-activated receptor-gamma and its ligands attenuate biologic functions of human natural killer

Xia Zhang1, Maria Cecilia Rodriguez-Galán, Jeff J Subleski

  • 1Laboratory of Experimental Immunology, Center for Cancer Reseach, National Cancer Institute-Frederick, National Institutes of Health, Frederick, MD 21702-1201, USA.

Blood
|July 22, 2004
PubMed

Insights

Peroxisome proliferator-activated-gamma (PPAR-gamma) ligands impair natural killer (NK) cell functions, including interferon-gamma (IFN-gamma) production and cytolytic activity. These effects depend on PPAR-gamma expression levels and offer therapeutic targets for innate immunity modulation.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Natural killer (NK) cells are crucial for innate immunity, mediating defense through interferon-gamma (IFN-gamma) production and cytolytic activity.
  • Peroxisome proliferator-activated-gamma (PPAR-gamma) is a nuclear receptor involved in various cellular processes, but its role in NK cell function is not fully understood.

Purpose of the Study:

  • To investigate the impact of peroxisome proliferator-activated-gamma (PPAR-gamma) ligands on human natural killer (NK) cell functions.
  • To elucidate the mechanisms underlying PPAR-gamma's influence on IFN-gamma production and cytolytic activity in NK cells.

Main Methods:

  • Treatment of human NK cells with natural (15-deoxy-Delta(12,14) prostaglandin J(2)) and synthetic (ciglitazone) PPAR-gamma ligands.
  • Analysis of IFN-gamma production, cytolytic activity, conjugate formation, and expression of CD69 and CD44.
  • Utilizing PPAR-gamma-null NK cells and overexpression systems to assess PPAR-gamma-dependent and -independent effects.

Main Results:

  • PPAR-gamma ligands reduced IFN-gamma production in both PPAR-gamma-null and PPAR-gamma-positive NK cells, with varying mechanisms.
  • Cytolytic activity was inhibited in PPAR-gamma-null NK cells but not affected in PPAR-gamma-positive NK cells.
  • PPAR-gamma ligands differentially affected CD69 expression, while CD44 expression remained unchanged.

Conclusions:

  • PPAR-gamma ligands modulate NK cell functions through both PPAR-gamma-dependent and -independent pathways.
  • These findings reveal novel regulatory mechanisms for NK cell activity within the innate immune response.
  • The study provides a foundation for developing therapeutic strategies targeting NK cell function for immune modulation.

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