Mitochondrion: A Common Organelle for Distinct Cell Deaths?

Area of Science:

• Cell Biology
• Biochemistry
• Pathology

Background:

• Mitochondria play critical roles in cellular metabolism, growth, and programmed cell death (apoptosis).
• Maintaining cellular homeostasis involves intricate regulation of mitochondrial functions, including energy production, redox balance, and calcium signaling.
• Mitochondria directly and indirectly influence cell death pathways, but their dispensability in certain death forms and pathway crosstalk highlight complexity.

Purpose of the Study:

• To review the multifaceted roles of mitochondria in various cell death pathways.
• To discuss the regulation of apoptosis and necrosis by mitochondrial proteins and mitophagy.
• To highlight the involvement of mitochondria in pathological conditions like cardiac and brain diseases.

Main Methods:

• Literature review of mitochondrial involvement in cell death.
• Analysis of mitochondrial proteins and mitophagy in regulating apoptosis and necrosis.
• Examination of pathological models involving cardiac and brain pathologies.

Main Results:

• Mitochondria are deeply implicated in cell fate decisions through metabolism, growth, and death regulation.
• Distinct cell death modalities can coexist, and mitochondria may be dispensable in some cases.
• Interconnections between cell death pathways can amplify lethality and overcome resistance mechanisms.

Conclusions:

• The control of cell fate is complex, requiring a reevaluation of mitochondrial roles.
• Mitochondrial proteins and mitophagy are key regulators of apoptosis and necrosis.
• Targeting mitochondria offers potential for developing cytoprotective therapies for pathologies.