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Induction of necrotic cell death and mitochondrial permeabilization by heme binding protein 2/SOUL

Andras Szigeti1, Szabolcs Bellyei, Balazs Gasz

  • 1Institute of Oncotherapy, University of Pécs, Pécs, Hungary.

FEBS Letters
|November 14, 2006
PubMed

Insights

Heme-binding protein 2 (SOUL) sensitizes cells to death by inducing mitochondrial permeability transition (mPT), a process inhibited by cyclosporine A (CsA). SOUL promotes necrotic cell death independently of reactive oxygen species.

Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Heme-binding protein 2 (SOUL) is implicated in cellular processes.
  • The precise mechanisms by which SOUL influences cell death remain incompletely understood.

Purpose of the Study:

  • To investigate the role of SOUL in cell death pathways.
  • To elucidate the mechanism of SOUL-induced cell death, particularly its relationship with mitochondrial function and reactive oxygen species (ROS).

Main Methods:

  • Utilized NIH3T3 cells treated with A23187 and etoposide.
  • Assessed cell death, reactive oxygen species (ROS) formation, and mitochondrial permeability transition (mPT) in vitro and in vivo.
  • Employed recombinant SOUL protein and inhibitors like cyclosporine A (CsA).

Main Results:

  • SOUL sensitized cells to A23187- and etoposide-induced cell death without affecting ROS levels.
  • Recombinant SOUL induced mPT in vitro, evidenced by mitochondrial membrane potential dissipation, an effect inhibited by CsA.
  • Flow cytometry confirmed SOUL promoted necrotic cell death, which was prevented by CsA.

Conclusions:

  • SOUL induces necrotic cell death through the induction of mPT.
  • This pro-death mechanism of SOUL operates independently of its heme-binding properties and ROS generation.
  • Cyclosporine A effectively inhibits SOUL-mediated necrotic cell death by preventing mPT.

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