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Hydroperoxide-metabolizing systems in rat liver.

H Sies, K H Summer

    European Journal of Biochemistry
    |September 15, 1975
    PubMed
    Summary
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    The liver metabolizes organic hydroperoxides via glutathione peroxidase and endoplasmic reticulum pathways. Glucose metabolism supports hydroperoxide removal, indicating pentose phosphate pathway involvement.

    Area of Science:

    • Biochemistry
    • Cell Biology
    • Toxicology

    Background:

    • Hydroperoxides are reactive oxygen species implicated in cellular damage.
    • Understanding cellular hydroperoxide metabolism is crucial for detoxification and disease research.

    Purpose of the Study:

    • To investigate the metabolic pathways of organic hydroperoxides in rat liver systems.
    • To elucidate the roles of glutathione peroxidase, endoplasmic reticulum, and pentose phosphate pathway in hydroperoxide detoxification.

    Main Methods:

    • Hemoglobin-free perfused rat liver experiments.
    • Isolated rat hepatocytes, microsomes, and mitochondria studies.
    • Measurement of glutathione disulfide (GSSG) release, lipid peroxidation markers, and 14CO2 release from [1-14C]glucose.

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    Main Results:

    • Perfused liver efficiently removes organic hydroperoxides, releasing GSSG, indicating glutathione peroxidase activity.
    • Endoplasmic reticulum, potentially via cytochrome P450-linked peroxidases, contributes to organic hydroperoxide metabolism.
    • Lipid peroxidation occurs in microsomes and mitochondria, but is limited in hepatocytes due to effective reducing systems, unless NADPH is depleted.
    • Hydroperoxide removal rates correlate with pentose phosphate pathway flux, enhanced by glucose in fasted rats.

    Conclusions:

    • Rat liver possesses robust systems for hydroperoxide detoxification involving glutathione peroxidase and the endoplasmic reticulum.
    • The pentose phosphate pathway plays a significant role in supporting hydroperoxide metabolism.
    • These findings provide insights into cellular defense mechanisms against oxidative stress.