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Related Experiment Videos

Pyran and polyribonucleotides: differences in biological activities.

P S Morahan, W Regelson, A E Munson

    Antimicrobial Agents and Chemotherapy
    |July 1, 1972
    PubMed
    Summary

    Maleic anhydride-divinyl ether copolymer (pyran) and polyribonucleotides are potent antiviral agents but differ significantly in biological activity and immune response modulation. Pyran exhibits unique toxicities and immunoadjuvant effects not seen with polyribonucleotides.

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    Area of Science:

    • Immunology
    • Pharmacology
    • Virology

    Background:

    • Maleic anhydride-divinyl ether copolymer (pyran) and polyribonucleotides are large polyanions with demonstrated antiviral properties.
    • Despite shared antiviral activity, their underlying biological mechanisms and effects vary considerably.

    Purpose of the Study:

    • To compare the distinct biological activities and immunological effects of pyran and polyribonucleotides.
    • To elucidate the differing mechanisms of antiviral action, immunoadjuvant potential, and toxicity profiles of these two polyanions.

    Main Methods:

    • Comparative analysis of antiviral activity, interferon induction, and immune response enhancement (Jerne hemolytic plaque-forming cell assay).
    • Assessment of phagocytic activity and drug metabolism inhibition in liver microsomes.

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  • Evaluation of endotoxin sensitization in mice.

    • Main Results:

    • Polyribonucleotides' antiviral activity correlated with interferon levels, while pyran's activity was independent of interferon induction.
    • Both compounds enhanced immune response, but via different immunoadjuvant mechanisms; pyran showed a biphasic effect on phagocytosis, unlike polyribonucleotides.
    • Pyran significantly sensitized mice to endotoxin, whereas polyribonucleotides did not.

    Conclusions:

    • Pyran and polyribonucleotides represent distinct classes of antiviral polyanions with divergent immunological and toxicological profiles.
    • Understanding these differences is crucial for their potential therapeutic applications and risk assessment.