Ferroptosis triggers mitochondrial fragmentation via Drp1 activation

Area of Science:

• Cell Biology
• Biochemistry
• Pathology

Background:

• Mitochondrial dynamics are crucial for cellular health and implicated in disease.
• Dynamin-related protein 1 (Drp1) regulates mitochondrial fission and cell death.
• Mitochondrial fragmentation occurs during ferroptosis, but its regulation and role are unknown.

Purpose of the Study:

• To investigate the role of Drp1 in ferroptosis.
• To determine if Drp1 activation and mitochondrial fragmentation contribute to ferroptosis execution.

Main Methods:

• Time-lapse microscopy to observe mitochondrial dynamics during ferroptosis.
• Analysis of Drp1 activation, phosphorylation, and mitochondrial translocation.
• Assessment of lipid peroxidation and cell death kinetics.
• Genetic manipulation of Drp1 and Mitofusin 2.

Main Results:

• Drp1 activation and mitochondrial fragmentation were observed upon ferroptosis induction.
• Drp1 accelerated ferroptosis cell death kinetics and mitochondrial fragmentation.
• Drp1 activation involved phosphorylation and translocation to mitochondria, further promoted by PGAM5.
• Drp1 depletion delayed mitochondrial and plasma membrane lipid peroxidation.

Conclusions:

• Drp1 activation and mitochondrial fragmentation accelerate ferroptosis.
• Drp1 plays a functional role in ferroptosis execution.
• Targeting mitochondrial dynamics, specifically Drp1, may offer therapeutic strategies for ferroptosis-associated diseases.