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Related Experiment Videos

Membrane-free scrapie activity.

T G Malone, R F Marsh, R P Hanson

    Journal of Virology
    |March 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Scrapie infectivity is present in brain supernatant, not just membranes. This suggests the scrapie agent can transmit independently of physical membrane structures.

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    Area of Science:

    • Neuroscience
    • Virology
    • Biochemistry

    Background:

    • Scrapie is a fatal neurodegenerative disease caused by prions.
    • The subcellular localization of the scrapie agent is crucial for understanding its transmission.

    Purpose of the Study:

    • To determine the distribution of scrapie infectivity in subcellular fractions of infected hamster brains.
    • To investigate whether scrapie agent transmission requires association with membrane structures.

    Main Methods:

    • Subcellular fractionation of infected hamster brains at different disease stages.
    • Assay of scrapie infectivity in high-speed supernatant fractions (100,000 x g).
    • Analysis of infectivity changes after homogenization of membrane-rich fractions.

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    Main Results:

    • Substantial scrapie infectivity was found in the 100,000 x g supernatant fractions.
    • Scrapie infectivity increased in supernatant fractions after vigorous homogenization of membrane-rich fractions.
    • The agent exhibited similar infectivity in both membrane-rich and supernatant fractions.

    Conclusions:

    • Association with discernible membrane structures is not essential for scrapie agent transmission.
    • The scrapie agent exists and transmits in a non-particulate or soluble form.
    • Homogenization releases the scrapie agent from potential membrane associations, making it detectable in supernatant fractions.