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Monitoring Cleaved Caspase-3 Activity and Apoptosis of Immortalized Oligodendroglial Cells using Live-cell Imaging and Cleaveable Fluorogenic-dye Substrates Following Potassium-induced Membrane Depolarization

Published on: January 13, 2012

Effect of reactive oxygen species on myelin membrane proteins

G W Konat, R C Wiggins

    Journal of Neurochemistry
    |October 1, 1985
    PubMed

    Insights

    Oxidative stress damages myelin proteins, leading to aggregation and altered lipid composition. This peroxidative damage to myelin proteins contributes to myelin sheath pathology and highlights membrane protein susceptibility to oxygen.

    Area of Science:

    • Neuroscience
    • Biochemistry
    • Cell Biology

    Background:

    • Myelin sheath is crucial for nerve impulse conduction.
    • Oxidative stress is implicated in various neurological disorders.
    • Understanding myelin protein susceptibility to damage is vital.

    Purpose of the Study:

    • To investigate the effects of oxidative damage on isolated rat myelin proteins.
    • To determine the relationship between protein aggregation and lipid peroxidation.
    • To explore changes in myelin subfractions under oxidative conditions.

    Main Methods:

    • Incubation of fresh rat myelin with copper ions (Cu2+) and hydrogen peroxide (H2O2).
    • Electrophoretic analysis of myelin proteins.
    • Quantification of lipid peroxidation products using thiobarbituric acid.
    • Separation and analysis of myelin subfractions based on buoyant density.

    Main Results:

    • Observed gradual loss of myelin proteins and increased protein aggregation.
    • Protein aggregation correlated with increased lipid peroxidation products.
    • Decreased light myelin fractions and increased heavier fractions were noted.
    • Protein aggregation was not directly linked to myelin fragment buoyant densities.

    Conclusions:

    • Peroxidative damage to myelin proteins contributes to myelin sheath pathology.
    • Myelin proteins are susceptible to oxygen-induced deterioration.
    • Findings suggest a mechanism for myelin damage in neurological conditions involving oxidative stress.

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