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Section of Retroviral Immunology, Center for Biologics Evaluation and Research, Food and Drug Administration, Bethesda, MD 20892
Immunostimulatory CpG oligonucleotides (ODN) show promise as immune
adjuvants, anti-allergens, and immunoprotective agents. Increasing
the bioavailability and duration of action of CpG ODN should improve
their therapeutic utility. Encapsulating ODN in sterically stabilized
cationic liposomes provides protection from serum nucleases while
facilitating uptake by B cells, dendritic cells, and macrophages. In a
pathogen challenge model, sterically stabilized cationic liposomes
encapsulation doubled the duration of CpG ODN-induced immune
protection. In an immunization model, coencapsulation of CpG ODN with
protein Ag (OVA) magnified the resultant Ag-specific IFN-
and IgG
responses by 15- to 40-fold compared with Ag plus CpG ODN alone. These
findings support the use of sterically stabilized cationic liposomes to
significantly enhance the therapeutic efficacy of CpG
ODN.
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