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Measurement of Natural Killer Cell-Mediated Cytotoxicity and Migration in the Context of Hepatic Tumor Cells
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Mechanisms of natural killer cell-mediated cellular cytotoxicity

Isabel Prager1, Carsten Watzl1

  • 1Department for Immunology, Leibniz Research Centre for Working Environment and Human Factors at TU Dortmund (IfADo), Dortmund, Germany.

Journal of Leukocyte Biology
|May 21, 2019
PubMed

Insights

Natural killer (NK) cells use granule-mediated and death receptor-mediated pathways to eliminate infected or cancerous cells. Understanding these cytotoxic mechanisms is crucial for advancing cancer immunotherapy.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Cellular cytotoxicity is a key immune defense against viral infections and cancer.
  • Cytotoxic T cells and natural killer (NK) cells are the primary mediators of cellular cytotoxicity.
  • NK cells employ distinct mechanisms to eliminate target cells.

Purpose of the Study:

  • To summarize the cytotoxic mechanisms employed by NK cells.
  • To elucidate the regulation and interplay of NK cell cytotoxic pathways.
  • To highlight the relevance of these mechanisms for cancer immunotherapy.

Main Methods:

  • Review of existing literature on NK cell cytotoxicity.
  • Analysis of granule-mediated cytotoxicity pathways, including perforin and granzymes.
  • Examination of death receptor-mediated apoptosis via Fas ligand and TRAIL.

Main Results:

  • NK cells induce target cell death through directed release of lytic granules or by triggering apoptosis via death receptors.
  • The biogenesis of cytotoxic molecules within lytic granules is tightly regulated to prevent self-damage.
  • NK cells possess self-protection strategies against their own cytotoxic contents.
  • Granule-mediated killing is rapid, while death receptor-mediated killing is slower, with both regulated during serial killing.

Conclusions:

  • NK cell cytotoxicity involves both rapid granule-mediated and slower death receptor-mediated apoptosis.
  • Understanding NK cell cytotoxic pathways is essential for improving cellular immunotherapies for cancer.
  • Further research into these mechanisms will drive advancements in therapeutic strategies.
Keywords:
apoptosisdeath receptorsdegranulationgranzymeperforin

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