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Artificial Antigen Presenting Cell (aAPC) Mediated Activation and Expansion of Natural Killer T Cells
13:18

Artificial Antigen Presenting Cell (aAPC) Mediated Activation and Expansion of Natural Killer T Cells

Published on: December 29, 2012

Detection and activation of human Valpha24+ natural killer T cells using alpha-galactosyl ceramide-pulsed dendritic

Shin-ichiro Fujii1, Kanako Shimizu, Ralph M Steinman

  • 1Laboratory of Tumor Immunology and Immunotherapy, The Rockefeller University, New York, NY 10021, USA.

Journal of Immunological Methods
|December 31, 2002
PubMed

Insights

A new enzyme-linked immunospot (ELISPOT) assay quantifies human natural killer T (NKT) cells in blood. Mature dendritic cells (DCs) pulsed with alpha-galactosylceramide (alpha-GalCer) are optimal for NKT cell activation and expansion.

Area of Science:

  • Immunology
  • Cellular immunology
  • Immunotherapy

Background:

  • Natural killer T (NKT) cells regulate immune responses and can be activated by alpha-galactosylceramide (alpha-GalCer) presented by CD1d molecules on antigen-presenting cells (APCs).
  • Quantifying NKT cell function in fresh human blood is crucial for research and therapeutic applications.

Purpose of the Study:

  • To develop a simple method for quantifying human NKT cell function in fresh blood.
  • To investigate the requirements for NKT cell activation by alpha-GalCer-loaded APCs.
  • To optimize conditions for NKT cell expansion and generation of NKT cell lines.

Main Methods:

  • Development and application of an enzyme-linked immunospot (ELISPOT) assay for quantifying freshly isolated human NKT cells.
  • Evaluation of different APC types (monocytes, macrophages, dendritic cells) for NKT cell activation.
  • Assessment of NKT cell function (cytokine secretion, target killing) after expansion with dendritic cells (DCs).

Main Results:

  • Freshly isolated human NKT cells can be quantified using an ELISPOT assay after stimulation with alpha-GalCer-loaded APCs.
  • Monocyte-derived DCs, particularly mature, alpha-GalCer-pulsed DCs, are more effective than monocytes/macrophages for NKT cell activation in fresh blood.
  • NKT cells expanded with DCs exhibit enhanced functionality, secreting both IFN-gamma and IL-4, and demonstrate cytotoxic activity.

Conclusions:

  • The ELISPOT assay provides a simple and effective method for monitoring human NKT cell function.
  • Mature, alpha-GalCer-pulsed DCs are optimal for NKT cell activation and expansion, offering a promising strategy for immune therapeutic targeting.
  • These findings establish conditions for DC loading with alpha-GalCer and provide a tool for NKT cell monitoring in clinical settings.

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