Mitochondrial dysfunction promotes aquaporin expression that controls hydrogen peroxide permeability and ferroptosis

Area of Science:

• Biochemistry
• Cell Biology
• Cancer Research

Background:

• Anti-cancer agents and radiotherapy often induce cell death through free radical production.
• Ferroptosis is a distinct form of cell death characterized by iron-dependent lipid peroxidation.
• The role of hydrogen peroxide (H2O2) in inducing ferroptosis and the involvement of mitochondria remain incompletely understood.

Purpose of the Study:

• To elucidate the involvement of mitochondria in H2O2-induced ferroptosis.
• To identify key molecular regulators of ferroptosis in response to H2O2.
• To explore the potential of H2O2 as a therapeutic agent for cancer treatment.

Main Methods:

• Utilized mitochondrial DNA-depleted ρ0 cells to investigate mitochondrial involvement in H2O2-induced ferroptosis.
• Examined the role of aquaporins (AQPs) and prohibitin 2 (PHB2) in regulating ferroptosis.
• Employed mitochondrial transfer experiments to assess the impact of mitochondrial function on H2O2 sensitivity.

Main Results:

• H2O2 induces ferroptosis within 3 hours, involving increased lipid peroxidation and Fe2+ levels, particularly in ρ0 cells.
• Aquaporins (AQP3, AQP5, AQP8) regulate extracellular H2O2 permeability and contribute to ferroptosis.
• Mitochondrial transfer to ρ0 cells reduced Fe2+ levels and H2O2 sensitivity, upregulating PHB2 and decreasing AQP expression.

Conclusions:

• H2O2-induced cell death is mediated by ferroptosis, with significant mitochondrial involvement.
• Aquaporins and prohibitin 2 are key regulators of H2O2-induced ferroptosis.
• H2O2 treatment, by modulating AQP, Fe2+, lipid peroxidation, and PHB2, presents a promising strategy for cancer therapy.