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    This study developed a polymer-nanoparticle hydrogel depot to extend the delivery of broadly neutralizing antibodies (bnAbs). This technology overcomes pharmacokinetic challenges, enabling sustained antibody levels for long-term passive immunization.

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    Area of Science:

    • Biomaterials Science
    • Immunology
    • Pharmacology

    Background:

    • Sustained serum levels of broadly neutralizing antibodies (bnAbs) are essential for effective passive immunization against infectious diseases.
    • Poor pharmacokinetics (PK) and administration challenges hinder the clinical use of bnAbs for prophylaxis.
    • Novel delivery systems are needed to prolong bnAb circulation and efficacy.

    Purpose of the Study:

    • To engineer a polymer-nanoparticle (PNP) hydrogel depot for sustained protein delivery.
    • To investigate the impact of hydrogel properties and biological factors on bnAb pharmacokinetics.
    • To predict human PK profiles for bnAb delivery using hydrogel technology.

    Main Methods:

    • Development and characterization of PNP hydrogel depots for protein delivery.
    • In-vivo studies in mice and rats to assess prolonged protein release.
    • Flow cytometry to analyze immune cell infiltration and antibody release mechanisms.
    • Multicompartmental modeling to predict human PK profiles.

    Main Results:

    • PNP hydrogel depots demonstrated prolonged release of antibody cargo in animal models.
    • Immune cell infiltration into the hydrogel led to faster-than-expected antibody release via active transport.
    • Co-formulation with an anti-inflammatory agent reduced cellular infiltration, extending delivery duration.
    • Predicted human PK profiles suggest potential for long-term immunoprophylaxis with subcutaneous hydrogel injection.

    Conclusions:

    • Engineered PNP hydrogel depots can significantly prolong the pharmacokinetics of bnAbs.
    • Controlling immune cell infiltration is key to optimizing hydrogel-based antibody delivery.
    • This technology offers a promising platform for developing next-generation long-acting immunoprophylaxis strategies.