4.5 Article

Mannosylated Cationic Liposomes/CpG DNA Complex for the Treatment of Hepatic Metastasis after Intravenous Administration in Mice

Journal

JOURNAL OF PHARMACEUTICAL SCIENCES
Volume 98, Issue 3, Pages 1193-1197

Publisher

ELSEVIER SCIENCE INC
DOI: 10.1002/jps.21475

Keywords

cancer; gene delivery; gene therapy; liposomes; non-viral gene delivery

Funding

  1. Ministry of Education, Culture, Sports, Science, and Technology of Japan
  2. Health and Labour Sciences Research
  3. Ministry of Health, Labour and Welfare of Japan
  4. Mochida Memorial Foundation for Medical and Pharmaceutical Research

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Immunotherapy using immunostimulatory CpG DNA could be a promising new therapeutic approach to combat refractory hepatic metastasis. In this study, we report the use of a conventional cationic liposomes/CpG DNA complex (Bare/CpG DNA lipoplex) and a mannosylated cationic liposomes/CpG DNA complex (Man/CpG DNA lipoplex) for effective inhibition of hepatic metastasis in mice. After intravenous administration of Bare/CpG DNA lipoplex, higher amounts of IL-12 and IFN-gamma were produced in serum or liver compared with naked CpG DNA, and their production was increased further by Man/CpG DNA lipoplex. Then, Bare/CpG DNA lipoplex and Man/CpG DNA lipoplex were administered intravenously to hepatic metastasis model mice, and the numbers of tumor cells (colon26/Luc) were quantitatively assayed. The number of tumor cells in Man/CpG DNA lipoplex-treated mice was same as those in Bare/CpG DNA lipoplex-treated mice. These results suggest that intravenous administration of not only Bare/CpG DNA lipoplex but also Man/CpG DNA lipoplex could be an efficient immunotherapy for hepatic metastasis. (C) 2008 Wiley-Liss, Inc. and the American Pharmacists Association J Pharm Sci 98:1193-1197, 2009

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