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Related Experiment Videos

The reticuloendothelial system in scrapie pathogenesis.

B Ehlers, R Rudolph, H Diringer

    The Journal of General Virology
    |February 1, 1984
    PubMed
    Summary
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    Dextran sulphate 500 extended survival in mice with scrapie infection, even when administered days after infection. This suggests dextran sulphate 500 may interfere with scrapie's infectious process within immune cells.

    Area of Science:

    • Neuroscience
    • Immunology
    • Pharmacology

    Background:

    • Scrapie is a fatal neurodegenerative disease caused by prions.
    • The lymphoreticular system plays a role in scrapie pathogenesis.
    • Current treatments for prion diseases are limited.

    Purpose of the Study:

    • To investigate the therapeutic potential of dextran sulphate 500 in scrapie infection.
    • To determine the effect of dextran sulphate 500 on scrapie incubation time and survival.
    • To explore the mechanism of action of dextran sulphate 500 in scrapie-infected mice.

    Main Methods:

    • Mice were infected with scrapie via intravenous or intraperitoneal routes.
    • A single injection of dextran sulphate 500 (1 mg/mouse) was administered at various time points post-infection.

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  • Incubation times and survival rates were monitored.
  • The distribution of dextran sulphate 500 in tissues was analyzed.
  • The reticuloendothelial system was blocked using trypan blue and silica to assess its role.

    • Main Results:

    • Dextran sulphate 500 significantly prolonged scrapie incubation times and increased survival rates.
    • Therapeutic effects were observed even when dextran sulphate 500 was administered 3 days post-infection.
    • Dextran sulphate 500 was detected in mononuclear phagocytes of the spleen and lymph nodes for up to 7 months.
    • Blockage of the reticuloendothelial system did not affect scrapie pathogenesis.

    Conclusions:

    • Dextran sulphate 500 demonstrates significant therapeutic potential against scrapie infection in mice.
    • The compound likely impairs a critical step in the scrapie infectious process within lymphoreticular cells.
    • Further research is warranted to elucidate the precise mechanism and clinical applicability of dextran sulphate 500 for prion diseases.