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Related Experiment Videos

Cholesterol esterifying enzyme in normal and degenerating peripheral nerve

J K Yao, P J Dyck

    Journal of Neurochemistry
    |July 1, 1981
    PubMed
    Summary

    Cholesterol esterifying enzyme activity increases significantly during nerve degeneration, peaking six days after injury. This elevated activity is crucial for cholesterol processing in Wallerian degeneration and nerve regeneration.

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    Area of Science:

    • Biochemistry
    • Neuroscience
    • Cell Biology

    Background:

    • Cholesterol metabolism is vital for nerve function and repair.
    • Understanding enzymes involved in cholesterol processing during nerve injury is essential.

    Purpose of the Study:

    • To characterize the cholesterol esterifying enzyme in rat sciatic endoneurium.
    • To investigate changes in enzyme activity during Wallerian degeneration and nerve regeneration.

    Main Methods:

    • Enzyme activity assays using [1-14C]oleate.
    • Subcellular fractionation to determine enzyme localization.
    • Analysis of enzyme activity during experimental nerve degeneration (crush injury).

    Main Results:

    • Cholesterol esterifying enzyme activity is present in rat sciatic endoneurium, with optimal activity at pH 4.8.

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  • Microsomal and soluble fractions show the highest specific activity.
  • A fivefold increase in enzyme activity occurs during nerve degeneration, peaking at 6 days post-crush and persisting for 90 days.

    • Conclusions:

    • Increased cholesterol esterifying enzyme activity is responsible for cholesterol esterification during Wallerian degeneration.
    • The enzyme's activity correlates with axonal degeneration and myelin ovoid formation.
    • This enzyme plays a key role in the dynamic changes of cholesterol metabolism during nerve repair.