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Photosensitization of membrane components.

R Santus, J P Reyftmann

    Biochimie
    |June 1, 1986
    PubMed
    Summary

    Photosensitized peroxidation of lipids generates reactive products that damage DNA and amino acids. Protein photooxidation and cross-linking impair cell membrane function.

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    Area of Science:

    • Biochemistry
    • Photochemistry
    • Cell Biology

    Background:

    • Unsaturated fatty acids and cholesterol are susceptible to photosensitized peroxidation.
    • Peroxide decomposition products can react with vital biomolecules.
    • Protein modifications impact cellular functions.

    Purpose of the Study:

    • To review the chemical mechanisms of photosensitized lipid peroxidation.
    • To analyze the reactions of peroxide decomposition products with biological targets.
    • To discuss the role of protein photooxidation in membrane dysfunction.

    Main Methods:

    • Literature review of chemical mechanisms.
    • Analysis of reaction pathways.
    • Discussion of experimental findings on protein modification.

    Main Results:

    • Detailed mechanisms of photosensitized peroxidation of unsaturated fatty acids and cholesterol.
    • Identification of reactive intermediates and their targets (DNA, amino acids).
    • Evidence for protein photooxidation and cross-linking leading to membrane impairment.

    Conclusions:

    • Photosensitized peroxidation initiates damaging cascade reactions.
    • Cellular components like DNA, amino acids, and proteins are vulnerable.
    • Impaired membrane function is a significant consequence of these photooxidative processes.

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