Adjuvant effect of liposome-encapsulated natural phosphodiester CpG-DNA

  • Kim, Dong-Bum (Department of Microbiology, College of Medicine, Hallym University) ;
  • Kwon, Sang-Hoon (Center for Medical Science Research, College of Medicine, Hallym University) ;
  • Ahn, Chi-Seok (Motaean Women's Hospital) ;
  • Lee, Young-Hee (Department of Biochemistry, College of Natural Sciences, Chungbuk National University) ;
  • Choi, Soo-Young (Department of Biomedical Science and Research Institute for Bioscience and Biotechnology, College of Medicine, Hallym University) ;
  • Park, Jin-Seu (Department of Biomedical Science and Research Institute for Bioscience and Biotechnology, College of Medicine, Hallym University) ;
  • Kwon, Hyeok-Yil (Department of Physiology, College of Medicine, Hallym University) ;
  • Kwon, Hyung-Joo (Department of Microbiology, College of Medicine, Hallym University)
  • Received : 2011.06.29
  • Accepted : 2011.07.30
  • Published : 2011.11.30


Immunostimulatory CpG-DNA targeting TLR9 is one of the most extensively evaluated vaccine adjuvants. Previously, we found that a particular form of natural phosphodiester bond CpG-DNA (PO-ODN) encapsulated in a phosphatidyl-${\beta}$-oleoyl-${\gamma}$-palmitoyl ethanolamine (DOPE) : cholesterol hemisuccinate (CHEMS) (1 : 1 ratio) complex (Lipoplex(O)) is a potent adjuvant. Complexes containing peptide and Lipoplex(O) are extremely useful for B cell epitope screening and antibody production without carriers. Here, we showed that IL-12 production was increased in bone marrow derived dendritic cells in a CpG sequence-dependent manner when PO-ODN was encapsulated in Lipoplex(O), DOTAP or lipofectamine. However, the effects of Lipoplex(O) surpassed those of PO-ODN encapsulated in DOTAP or lipofectamine and also other various forms of liposome-encapsulated CpG-DNA in terms of potency for protein antigen-specific IgG production and Th1- associated IgG2a production. Therefore, Lipoplex(O) may have a unique potent immunoadjuvant activity which can be useful for various applications involving protein antigens as well as peptides.




Supported by : National Research Foundation


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