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How do cytotoxic lymphocytes kill their targets?

S Shresta1, C T Pham, D A Thomas

  • 1Department of Medicine, Washington University School of Medicine, St Louis, MO 63110-1093, USA.

Current Opinion in Immunology
|October 31, 1998
PubMed

Insights

Different immune cells use distinct pathways, like perforin/granzyme or Fas, to induce cell death. These distinct cytotoxic lymphocyte mechanisms may converge on shared molecular substrates for apoptosis.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Immune cells like CD8+ cytotoxic lymphocytes, natural killer cells, and lymphokine-activated killer cells primarily use the perforin/granzyme system for target cell lysis.
  • CD4+ T cells, in contrast, employ the Fas pathway and other mechanisms to induce target cell apoptosis.

Purpose of the Study:

  • To investigate the molecular convergence of distinct cell death pathways utilized by different immune cells.
  • To identify common molecular substrates involved in apoptosis induction by cytotoxic lymphocytes and T cells.

Main Methods:

  • Comparative analysis of molecular pathways involved in immune cell-mediated cytotoxicity.
  • Examination of apoptotic signaling cascades in target cells upon interaction with various immune effector cells.

Main Results:

  • The perforin/granzyme system is the primary cytotoxic mechanism for CD8+ T cells, NK cells, and LAK cells.
  • CD4+ T cells induce apoptosis mainly through the Fas pathway.
  • Evidence suggests that these diverse cell death pathways converge on shared molecular substrates.

Conclusions:

  • Despite utilizing different initiation mechanisms (perforin/granzyme vs. Fas), the molecular pathways leading to target cell apoptosis show convergence.
  • Understanding these common death substrates is crucial for comprehending immune regulation and developing targeted therapies.

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