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What are killer cells and what do they do?

P G Hogan1, A Basten

  • 1Clinical Immunology Research Centre, University of Sydney, NSW, Australia.

Blood Reviews
|March 1, 1988
PubMed
Summary

Immune system killer cells, including natural killer (NK) cells and cytotoxic T lymphocytes, are crucial for eliminating infected or cancerous cells. Their complex roles in immunity and disease pathogenesis are still being explored.

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Area of Science:

  • Immunology
  • Cellular Biology

Background:

  • Cytotoxic effector functions are primarily mediated by various killer cell lineages within the immune system.
  • These cells, ranging from granulocytes and NK cells to macrophages and cytotoxic T lymphocytes, possess dual roles in cytotoxicity and immunoregulation.

Purpose of the Study:

  • To provide an overview of the diverse killer cell populations in the immune system.
  • To highlight their roles in host defense against pathogens and malignancies.
  • To discuss their involvement in immune regulation and the pathogenesis of human diseases, particularly autoimmunity.

Main Methods:

  • Review and synthesis of existing knowledge on killer cell populations and functions.
  • Discussion of the mechanisms of cell-mediated cytotoxicity.
  • Exploration of the roles of different killer cells in immune responses and disease.

Main Results:

  • Killer cells are essential for immune-directed cell death, excluding complement-mediated lysis.
  • Granulocytes, macrophages, and NK cells form the initial defense against infections and tumors.
  • Cytotoxic T cells represent a highly refined killer cell population with antigen-specific recognition.

Conclusions:

  • Killer cells are vital for defense against infection and malignancy, and for immune regulation.
  • The precise mechanisms of killer cell interactions and lytic events require further investigation.
  • Macrophages, NK cells, and cytotoxic T cells play significant roles in the pathogenesis of autoimmune diseases.

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