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Human NKT cells mediate antitumor cytotoxicity directly by recognizing target cell CD1d with bound ligand or

L S Metelitsa1, O V Naidenko, A Kant

  • 1Division of Hematology-Oncology, Department of Pediatrics, Children's Hospital Los Angeles and Keck School of Medicine, University of Southern California, Los Angeles, CA 90027, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|September 7, 2001
PubMed

Insights

Human NKT cells exhibit potent antitumor activity by directly killing CD1d-expressing tumor cells or indirectly activating NK cells. This immune response is dependent on CD1d and alpha-Galactosylceramide (alphaGalCer) recognition.

Area of Science:

  • Immunology
  • Cancer Biology

Background:

  • alpha-Galactosylceramide (alphaGalCer) stimulates NKT cells, showing antitumor effects in mice.
  • Mechanisms of NKT cell-mediated tumor cell killing and NK cell activation are not fully understood.

Purpose of the Study:

  • To investigate the mechanisms of human NKT cell cytotoxicity and NK cell activation using CD1d/alphaGalCer tetrameric complexes.
  • To determine the role of CD1d expression and alphaGalCer in NKT cell-mediated anti-tumor immunity.

Main Methods:

  • Generation of highly purified human alphaGalCer-reactive NKT cell lines (>99%).
  • Assessment of NKT cell cytotoxicity against various tumor cell lines (CD1d-positive and CD1d-negative).
  • Evaluation of NK cell activation induced by NKT cells upon CD1d/alphaGalCer recognition.

Main Results:

  • Human NKT cells demonstrated CD1d-dependent cytotoxicity against neuroblastoma cells engineered to express CD1d and pulsed with alphaGalCer.
  • Constitutively CD1d-positive leukemia cell lines (Jurkat, U937) were susceptible to NKT cell killing, enhanced by alphaGalCer.
  • NKT cells activated NK cells to kill CD1d-negative neuroblastoma cells, dependent on NKT-derived IL-2 and IFN-gamma.

Conclusions:

  • Human NKT cell cytotoxicity is dependent on CD1d and its ligand, alphaGalCer.
  • TCR-stimulated NKT cells produce IL-2, which is crucial for inducing NK cell cytotoxicity.
  • NKT cells exert potent antitumor effects through direct cytotoxicity and indirect activation of NK cells.

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