PH-sensitive polymer-liposome-based antigen delivery systems potentiated with interferon-γ gene lipoplex for efficient cancer immunotherapy

Eiji Yuba, Yuhei Kanda, Yuta Yoshizaki, Ryoma Teranishi, Atsushi Harada, Kikuya Sugiura, Takeshi Izawa, Jyoji Yamate, Naoki Sakaguchi, Kazunori Koiwai, Kenji Kono

Research output: Contribution to journalArticlepeer-review

70 Citations (Scopus)


Potentiation of pH-sensitive liposome-based antigen carriers with IFN-γ gene lipoplexes was attempted to achieve efficient induction of tumor-specific immunity. 3-Methylglutarylated poly(glycidol) (MGluPG)-modified liposomes and cationic liposomes were used, respectively, for the delivery of antigenic protein ovalbumin (OVA) and IFN-γ-encoding plasmid DNA (pDNA). The MGluPG-modified liposomes and the cationic liposome-pDNA complexes (lipoplexes) formed hybrid complexes via electrostatic interactions after their mixing in aqueous solutions. The hybrid complexes co-delivered OVA and IFN-γ-encoding pDNA into DC2.4 cells, a murine dendritic cell line, as was the case of MGluPG-modified liposomes for OVA or the lipoplexes for pDNA. Both the lipoplexes and the hybrid complexes transfected DC2.4 cells and induced IFN-γ protein production, but transfection activities of the hybrid complexes were lower than those of the parent lipoplexes. Subcutaneous administration of hybrid complexes to mice bearing E.G7-OVA tumor reduced tumor volumes, which might result from the induction of OVA-specific cytotoxic T lymphocytes (CTLs). However, the hybrid complex-induced antitumor effect was the same level of the MGluPG-modified liposome-mediated antitumor immunity. In contrast, an extremely strong antitumor immune response was derived when these liposomes and lipoplexes without complexation were injected subcutaneously at the same site of tumor-bearing mice. Immunohistochemical analysis of tumor sections revealed that immunization through the liposome-lipoplex combination promoted the infiltration of CTLs to tumors at an early stage of treatment compared with liposomes, resulting in strong therapeutic effects.

Original languageEnglish
Pages (from-to)214-224
Number of pages11
Publication statusPublished - 2015 Oct 1
Externally publishedYes


  • Cancer immunotherapy
  • Cellular immunity
  • Dendritic cell
  • Interferon-γ
  • Lipoplex
  • PH-sensitive liposome

ASJC Scopus subject areas

  • Biophysics
  • Bioengineering
  • Ceramics and Composites
  • Biomaterials
  • Mechanics of Materials


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