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Immunogenicity of immunoliposomes.

N C Phillips1, A Emili

  • 1Montreal General Hospital Research Institute, Quebec, Canada.

Immunology Letters
|November 1, 1991
PubMed
Summary

Immunoliposomes with surface IgG are immunogenic, inducing antibody responses. Repeated administration of these immunoliposomes leads to anti-IgG antibodies, reducing their circulation time in mice.

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Area of Science:

  • Biotechnology
  • Immunology
  • Drug Delivery

Background:

  • Liposomes are versatile drug delivery vehicles.
  • Immunoliposomes combine liposomal properties with targeting capabilities.
  • Surface-bound antibodies on liposomes can influence their immunogenicity and pharmacokinetics.

Purpose of the Study:

  • To prepare and characterize multilamellar immunoliposomes.
  • To evaluate the immunogenicity of immunoliposomes displaying specific IgG antibodies.
  • To determine the effect of surface-bound IgG on the circulation time of liposomes.

Main Methods:

  • Preparation of multilamellar immunoliposomes using DPPC, cholesterol, SPH, and PEB.
  • Surface functionalization with avidin-biotinylated sheep anti-mouse IgG (AV-sIgGB) or GK1.5 monoclonal rat IgG (AV-GK1.5B).
  • Assessment of antibody responses and liposome circulation times in mice post-immunization.

Main Results:

  • Immunoliposomes elicited antibody responses against surface-bound IgG.
  • Liposomal formulations were more effective in inducing antibodies than free IgG.
  • Immunoliposomes showed slower initial circulation but were rapidly cleared from immunized mice due to anti-IgG antibodies.

Conclusions:

  • Surface-bound IgG renders liposomes immunogenic.
  • Repeated administration of immunoliposomes induces anti-IgG antibodies.
  • Anti-IgG antibodies significantly reduce the blood circulation residence time of immunoliposomes.

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