Mitochondria, the killer organelles and their weapons

✍ Scribed by Luigi Ravagnan; Thomas Roumier; Guido Kroemer

• Book ID: 102307925
• Publisher: John Wiley and Sons
• Year: 2002
• Tongue: English
• Weight: 182 KB
• Volume: 192
• Category: Article
• ISSN: 0021-9541
• DOI: 10.1002/jcp.10111

✦ Synopsis

Abstract

Apoptosis is a cell‐autonomous mode of death that is activated to eradicate superfluous, damaged, mutated, or aged cells. In addition to their role as the cell's powerhouse, mitochondria play a central role in the control of apoptosis. Thus, numerous pro‐apoptotic molecules act on mitochondria and provoke the permeabilization of mitochondrial membranes. Soluble proteins contained in the mitochondrial intermembrane space are released through the outer membrane and participate in the organized destruction of the cell. Several among these lethal proteins can activate caspases, a class of cysteine proteases specifically activated in apoptosis, whereas others act in a caspase‐independent fashion, by acting as nucleases (e.g., endonuclease G), nuclease activators (e.g., apoptosis‐inducing factor), or serine proteases (e.g., Omi/HtrA2). In addition, mitochondria can generate reactive oxygen species, following uncoupling and/or inhibition of the respiratory chain. The diversity of mitochondrial factors participating in apoptosis emphasizes the central role of these organelles in apoptosis control and unravels novel mechanisms of cell death execution. © 2002 Wiley‐Liss, Inc.