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Role of the mitochondrial membrane permeability transition in cell death

Yoshihide Tsujimoto1, Shigeomi Shimizu

  • 1Osaka University Medical School, Department of Medical Genetics, SORST of the Japan Science and Technology Agency, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan.

Apoptosis : an International Journal on Programmed Cell Death
|December 1, 2006
PubMed

Insights

Cyclophilin D (Cyp D) is essential for mitochondrial membrane permeability transition (MPT), a key event in necrotic cell death and ischemia/reperfusion injury. Blocking MPT with proteins like Bcl-2 inhibits necrosis.

Area of Science:

  • Mitochondrial biology
  • Cell death mechanisms
  • Biochemistry

Background:

  • Mitochondria play a critical role in both apoptotic and necrotic cell death pathways.
  • Increased mitochondrial membrane permeability is a hallmark of cell death, but the underlying mechanisms are not fully understood.
  • The mitochondrial membrane permeability transition (MPT) involves a Ca(2+)-dependent pore opening, leading to mitochondrial dysfunction.

Purpose of the Study:

  • To investigate the role of cyclophilin D (Cyp D) in the mitochondrial membrane permeability transition (MPT).
  • To determine the involvement of Cyp D-dependent MPT in different forms of cell death and tissue injury.
  • To explore the potential of anti-apoptotic proteins in modulating MPT-dependent necrosis.

Main Methods:

  • Studies utilizing Cyp D-deficient mice.
  • Analysis of MPT occurrence and its regulation in various cell death contexts.
  • Investigation of the effects of Bcl-2 and Bcl-x(L) on MPT.

Main Results:

  • Cyp D is essential for the MPT.
  • The Cyp D-dependent MPT regulates specific forms of necrotic cell death, but not apoptotic cell death.
  • Cyp D-deficient mice exhibit reduced ischemia/reperfusion injury, highlighting the role of MPT in this process.
  • Anti-apoptotic proteins Bcl-2 and Bcl-x(L) inhibit MPT-dependent necrosis.

Conclusions:

  • Cyclophilin D is a critical regulator of the mitochondrial permeability transition pore (PTP).
  • The Cyp D-dependent MPT is a key pathway for necrotic cell death and contributes significantly to ischemia/reperfusion injury.
  • Targeting the MPT pathway, potentially via agents like Bcl-2, offers a therapeutic strategy for mitigating necrosis and related pathologies.

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