The mitochondrial voltage-dependent anion channel (VDAC) as a therapeutic target for initiating cell death

David J Granville1, Roberta A Gottlieb

  • 1The Scripps Research Institute, Department of Molecular and Experimental Medicine, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.

Insights

Voltage-dependent anion channels (VDAC) are key to mitochondrial outer membrane permeability and apoptosis. This review explores VDAC

Area of Science:

  • Mitochondrial biology
  • Cell death pathways
  • Ion channel function

Background:

  • Voltage-dependent anion channels (VDAC) are integral proteins in the outer mitochondrial membrane.
  • VDAC's role in mitochondrial outer membrane permeability and apoptosis regulation is debated.
  • Understanding VDAC function is crucial for deciphering cell death mechanisms.

Purpose of the Study:

  • To review current knowledge on VDAC's role in cell death regulation.
  • To discuss mechanisms of VDAC involvement in apoptosis.
  • To explore potential therapeutic strategies targeting VDAC.

Main Methods:

  • Literature review of VDAC function in cell death.
  • Analysis of hypotheses regarding VDAC and mitochondrial permeability.
  • Synthesis of information on VDAC modulation for therapeutic purposes.

Main Results:

  • VDAC plays a significant role in regulating mitochondrial outer membrane permeability.
  • Evidence supports VDAC's involvement in the release of apoptosis-promoting factors.
  • Current research presents conflicting data on VDAC's precise function in apoptosis.

Conclusions:

  • VDAC is a critical regulator of cell death.
  • Modulating VDAC activity offers potential therapeutic avenues for diseases involving apoptosis.
  • Further research is needed to fully elucidate VDAC's complex role in cell death.

Related Concept Videos

Mitochondrial Membranes01:45

Mitochondrial Membranes

A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
Voltage-gated Ion Channels01:26

Voltage-gated Ion Channels

Voltage-gated ion channels are transmembrane proteins that open and close in response to changes in the membrane potential. They are present on the membranes of all electrically excitable cells such as neurons, heart, and muscle cells.
Generally, all voltage-gated ion channels have a 'voltage-sensing domain' that spans the lipid bilayer. The charged residues in the sensor move in response to the membrane potential changes that open the channel allowing ions movement. There are several types of...
The Intrinsic Apoptotic Pathway01:31

The Intrinsic Apoptotic Pathway

Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...
Autophagic Cell Death01:18

Autophagic Cell Death

Christian de Duve discovered “autophagy,” a process in which cellular components are engulfed by membrane-bound organelles called autophagosomes. The autophagosomes then fuse with lysosomes to digest the enclosed contents. Autophagy is generally activated in cells to prevent cell death. However, cell death is triggered when the damage is beyond repair.
Autophagy and Apoptosis
Autophagy can activate apoptosis. In normal conditions, the autophagy activating protein Beclin-1 and pro-apoptotic...
Cellular Injury IV: Necrosis01:16

Cellular Injury IV: Necrosis

Necrosis is a form of irreversible cell death caused by severe injury such as ischemia, toxins, or trauma. Unlike programmed cell death, it is an uncontrolled, pathological process that typically provokes inflammation in surrounding tissues.Pathophysiologic ChangesNecrosis begins when cells sustain critical damage, leading to swelling of organelles, particularly mitochondria, and rapid ATP depletion. As energy levels decline, membrane ion pumps fail, leading to calcium influx and eventually,...