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Related Experiment Videos

Interferon induction by poly (I): poly (C) enclosed in phospholipid particles.

S X Straub, R F Garry, W E Magee

    Infection and Immunity
    |October 1, 1974
    PubMed
    Summary

    Liposomes carrying poly(I):poly(C) enhanced interferon production in mice, with sphingomyelin and lecithin liposomes being most effective. Biodistribution studies showed rapid clearance and liver accumulation of radiolabeled liposomes.

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    Area of Science:

    • Biotechnology
    • Immunology
    • Drug Delivery

    Background:

    • Liposomes are versatile drug delivery systems.
    • Poly(I):poly(C) is a known interferon inducer.
    • Liposome charge and composition influence cellular interaction and in vivo behavior.

    Purpose of the Study:

    • To evaluate the impact of liposome composition and charge on cellular interaction.
    • To assess the efficacy of poly(I):poly(C)-containing liposomes in stimulating serum interferon response in mice.
    • To determine the biodistribution and pharmacokinetic profile of liposomal poly(I):poly(C) in vivo.

    Main Methods:

    • Liposomes were formulated using various phospholipids, cholesterol, and charged lipids.
    • Cellular attachment assays were performed using L-929 cells.

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  • Antiviral activity was assessed, though complicated by liposome toxicity.
  • Serum interferon levels were measured in mice following intravenous injection of liposomal poly(I):poly(C).
  • Biodistribution studies utilized [(14)C]-labeled poly(I):poly(C) encapsulated in sphingomyelin liposomes.

    • Main Results:

    • Neutral and positively charged liposomes exhibited superior attachment to L-929 cells compared to negatively charged ones.
    • Liposomes containing poly(I):poly(C) significantly potentiated and prolonged the serum interferon response in mice, with lecithin and sphingomyelin formulations being particularly effective.
    • Intravenously administered sphingomyelin liposomes showed rapid clearance from circulation (88% within 3 min) and preferential accumulation in the liver (70% at 3 min).
    • Significant interferon levels were detected in the spleen at 4 hours post-injection.
    • Intraperitoneal administration also led to liver accumulation, with 26% of the dose recovered in the liver after 4 hours.

    Conclusions:

    • Liposome charge and composition are critical factors influencing cellular interactions and in vivo immune responses.
    • Liposomal encapsulation of poly(I):poly(C) enhances its interferon-inducing capacity and modifies its pharmacokinetic profile.
    • Sphingomyelin liposomes demonstrate efficient delivery and prolonged retention in the liver, suggesting potential for targeted delivery applications.