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Oxygen radicals induce poly(ADP-ribose) polymerase-dependent cell death in cytotoxic lymphocytes

Fredrik B Thorén1, Ana I Romero, Kristoffer Hellstrand

  • 1Department of Virology, Sahlgrenska Academy, Göteborg University, Sweden.

Journal of Immunology (Baltimore, Md. : 1950)
|June 6, 2006
PubMed

Insights

Poly(ADP-ribose) polymerase (PARP) inhibitors fully protected cytotoxic lymphocytes from oxygen radical-induced apoptosis, preserving their function. This highlights the critical role of the PARP/apoptosis-inducing factor pathway in lymphocyte cell death.

Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • Cytotoxic T cells and NK cells undergo apoptosis upon exposure to oxygen radicals.
  • The precise molecular mechanisms driving this radical-induced cell death are not fully understood.
  • Caspases and poly(ADP-ribose) polymerase (PARP) are key enzymes in executing cell death.

Purpose of the Study:

  • To investigate the roles of caspases and PARP in oxygen radical-induced apoptosis of cytotoxic lymphocytes.
  • To determine the protective effects of inhibiting these enzymes on lymphocyte function.

Main Methods:

  • Treatment of human cytotoxic lymphocytes with oxygen radicals.
  • Application of caspase and PARP inhibitors.
  • Assessment of apoptosis, DNA degradation, and cytotoxic function.
  • Analysis of apoptosis-inducing factor nuclear translocation.

Main Results:

  • Caspase inhibitors offered only marginal protection against radical-induced apoptosis.
  • PARP inhibitors completely prevented apoptosis and restored cytotoxic function in lymphocytes.
  • PARP-dependent cell death involved nuclear accumulation of apoptosis-inducing factor and large-fragment DNA degradation.

Conclusions:

  • The poly(ADP-ribose) polymerase (PARP)/apoptosis-inducing factor axis is crucial for oxygen radical-induced apoptosis in cytotoxic lymphocytes.
  • Targeting the PARP pathway may be a therapeutic strategy to preserve lymphocyte function in conditions involving oxidative stress.

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