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Updated: Jun 16, 2025

Antigenic Liposomes for Generation of Disease-specific Antibodies
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Antigenic Liposomes for Generation of Disease-specific Antibodies

Published on: October 25, 2018

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Immunotherapy Platform That Conjugates Antigen to Complement C3-Targeted Liposomes Induces a Robust Adaptive Immune

R G Barber1, Steven Cherry1, Sydney Stephens1

  • 1WWAMI School of Medical Education, University of Alaska Anchorage, 3211 Providence Drive, Anchorage, AK 99508, USA.

International Journal of Molecular Sciences
|June 13, 2025
PubMed

The activation of immunosuppressed antigen-presenting cells (APCs) in the tumor microenvironment is a key goal in modern cancer immunotherapy. Our laboratory utilizes a liposome-based immunotherapy platform that binds endogenous complement to deliver antigen, adjuvant, and therapeutic agents to APCs in vivo. The liposomes contain external linker groups, which readily bind complement protein C3, and mediate liposomal uptake via complement receptor 3 into APCs. To test the ability of a model antigen to bind to these external linker groups on C3-liposomes and elicit a robust adaptive immune response, we conjugated a modified ovalbumin peptide (OVA-C) to the liposomes and incorporated a toll-like receptor (TLR) 4 agonist, monophosphoryl lipid A (MPLA), in the liposomal membrane. Adaptive immune responses from C57BL/6 mice were analyzed by ELISA and ELISpot. Mice vaccinated with OVA-C liposomes elicited significantly greater humoral and cellular adaptive responses relative to controls. Furthermore, female mice vaccinated with MPLA + OVA-C liposomes produced significantly more IgG antibodies than males vaccinated with the same liposomes. In conclusion, antigen binding on the exterior of C3-liposomes markedly improves antigen loading efficiency and still allows for complement C3-targeted delivery to APCs. These data demonstrate the initiation of a robust cellular and humoral immune response using a new liposomal delivery platform.

Keywords:
antigen presenting cellscancercomplement C3 targetingimmune modulationliposomal deliverytoll-like receptor agonist

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