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Interactions between iron metabolism and oxygen activation.

R R Crichton

    Ciba Foundation Symposium
    |June 6, 1978
    PubMed
    Summary

    Iron's redox states (FeII/FeIII) facilitate oxygen activation, linking its metabolism to normal and pathological processes. Dysregulated iron metabolism can cause oxidative damage, potentially reversed by chelation therapy.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Cellular Metabolism

    Background:

    • Iron's ability to exist as ferrous (FeII) and ferric (FeIII) ions in aqueous solution makes it crucial for molecular oxygen activation.
    • Understanding the interplay between iron metabolism and oxygen activation is key to comprehending both normal physiological functions and pathological conditions.

    Purpose of the Study:

    • To explore the link between iron metabolism and oxygen activation in biological systems.
    • To elucidate the mechanisms of iron oxidation, storage in ferritin, and release.
    • To rationalize the consequences of iron overload and the potential of chelation therapy.

    Main Methods:

    • Investigated iron oxidation and deposition within ferritin, identifying a stable peroxo-complex intermediate.
    • Proposed a mechanism for iron release from ferritin involving flavin reduction and cofactor cycling (NADH/NADPH).
    • Reviewed the consequences of iron overload, attributing them to oxidative free-radical reactions.

    Main Results:

    • Demonstrated that iron oxidation and ferritin deposition involve oxygen activation, forming a peroxo-intermediate bound between two iron atoms.
    • Identified a flavin cofactor associated with ferritin that facilitates iron release via redox cycling.
    • Linked excessive iron overload to oxidative damage and proposed chelation therapy as a potential treatment.

    Conclusions:

    • Iron's redox properties are central to oxygen activation in biological systems.
    • Ferritin plays a key role in iron storage and release, involving oxygen activation and flavin-mediated reduction.
    • Iron overload leads to pathological conditions driven by oxidative stress, which may be managed with iron chelators.

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