Ferroptosis: iron release mechanisms in the bioenergetic process

Area of Science:

• Biochemistry
• Cell Biology
• Molecular Medicine

Background:

• Ferroptosis is an iron-dependent cell death pathway.
• Research has focused on lipid peroxidation and iron sources for the Fenton reaction.
• The predominant iron release mechanism identified is ferritinophagy, linked to iron starvation.

Purpose of the Study:

• To propose and detail three distinct mechanisms of iron mobilization in ferroptosis.
• To explore iron mobilization pathways independent of iron starvation.
• To elucidate the relationship between iron mobilization, bioenergetics, and oxidative stress.

Main Methods:

• Literature review and synthesis of existing research on ferroptosis.
• Analysis of molecular mechanisms of iron release from ferritin.
• Integration of findings on bioenergetic processes and oxidative stress.

Main Results:

• Three iron mobilization mechanisms are proposed: ferritinophagy, reductive pathways, and quinone-mediated pathways.
• Reductive and quinone-mediated pathways operate independently of iron starvation, utilizing reductants like NADH and O2•-.
• Inhibition of the respiratory chain promotes iron release and impacts AMP-activated protein kinase.

Conclusions:

• Iron mobilization in ferroptosis is more complex than previously understood, involving multiple pathways.
• Understanding these mechanisms is crucial for developing targeted ferroptosis-modulating therapies.
• This review bridges the understanding of iron mobilization, bioenergetics, and ferroptosis.