Disrupting mitochondrial dynamics attenuates ferroptosis and chemotoxicity via upregulating NRF2-mediated FSP1...

Area of Science:

• Cellular Biology
• Biochemistry
• Pathology

Background:

• Ferroptosis is a regulated form of cell death driven by iron-dependent lipid peroxidation.
• Mitochondria are crucial for ferroptosis, and their dynamics are essential for cellular health.
• The precise role of mitochondrial dynamics in regulating ferroptosis remains unclear.

Purpose of the Study:

• To investigate the role of mitochondrial dynamics in ferroptosis.
• To elucidate the molecular mechanisms by which mitochondrial dynamics influence ferroptosis.
• To explore the therapeutic potential of modulating mitochondrial dynamics in the context of chemotherapy.

Main Methods:

• Studying the effects of inhibiting key mitochondrial dynamics proteins (DRP1, Mitofusins, OPA1) on ferroptosis.
• Analyzing the impact of mitochondrial dynamics defects on cellular energy status (ATP/ADP ratios) and signaling pathways (AMPK, NRF2).
• Evaluating the expression of ferroptosis-related genes (FSP1) and the efficacy of a mitochondrial fusion promoter (M1) against doxorubicin-induced chemotoxicity.

Main Results:

• Mitochondrial fission is induced during ferroptosis.
• Disrupting mitochondrial dynamics by altering DRP1, Mitofusins, or OPA1 expression inhibits ferroptosis.
• Impaired mitochondrial dynamics activate AMPK, leading to NRF2 phosphorylation and nuclear translocation, which upregulates FSP1 and confers ferroptosis resistance.
• Mitochondrial fusion promoter M1 reduces doxorubicin chemotoxicity without affecting its anti-cancer effect.

Conclusions:

• Mitochondrial dynamics play a critical role in regulating ferroptosis.
• Modulating mitochondrial dynamics presents a potential therapeutic approach to mitigate chemotherapy-induced toxicity.
• Targeting mitochondrial dynamics offers a novel strategy for cancer therapy and supportive care.