Mitochondrial event as an ultimate step in ferroptosis

Area of Science:

• Cellular Biology
• Biochemistry
• Oncology

Background:

• The role of mitochondria in ferroptosis, a regulated cell death pathway, remains debated.
• Mitochondrial dysfunction is implicated in various diseases, including cancer.

Purpose of the Study:

• To investigate the specific role of mitochondrial events in ferroptosis.
• To elucidate the contribution of mitochondrial reactive oxygen species (ROS) to ferroptosis induction.

Main Methods:

• Utilized mitochondrial DNA-depleted ρ0 cells, which exhibit resistance to ferroptosis.
• Assessed ferroptosis induction using erastin and RSL3, common ferroptosis inducers.
• Quantified cellular and mitochondrial ROS and lipid peroxidation.
• Employed mitochondrial ROS quenchers (MitoQ) and a voltage-dependent anion channel (VDAC) inhibitor.

Main Results:

• Mitochondrial GPx4 (mGPx4) upregulation in ρ0 cells conferred resistance to erastin-induced ferroptosis.
• Both erastin and RSL3 induced mitochondrial ROS and lipid peroxidation in parental (ρ+) cells.
• Inhibition of mitochondrial ROS or VDAC significantly reduced ferroptosis.
• Sorafenib-induced ferroptosis was also sensitive to mitochondrial ROS inhibition.

Conclusions:

• Mitochondrial events, particularly ROS generation, are critical determinants of ferroptosis.
• Mitochondria are key players in the execution phase of ferroptosis.
• VDAC is implicated in mitochondrial pathways contributing to ferroptosis.