The opposing effects of lipopolysaccharide on the antitumor therapeutic efficacy of DNA vaccine

Chi Chen Lin, Huei Jiun Yang, Cheng Fen Tu, Ming Derg Lai

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

DNA vaccine represents a novel method to elicit immunity against infectious disease. Lipopolysaccharide (LPS) copurified with plasmid DNA may affect therapeutic efficacy and immunological response. We aimed to study the effect of LPS on the therapeutic efficacy of HER-2/neu DNA vaccine in a mouse tumor animal model. Plasmid DNA purified from commercial EndoFree plasmid purification kits functioned as a better therapeutic DNA vaccine than that purified from Non-EndoFree purification kit, which contains ≥0.5 μg LPS per 100 mg DNA plasmid. To further investigate the effect of LPS on the therapeutic efficacy of DNA vaccine, increasing amount of LPS was added to endotoxin-free plasmid DNA, and inoculated on mice with established tumors. One μg of LPS significantly attenuated the therapeutic effect of neu DNA vaccine and increased Th2 immune responses bias with interleukin-4 cytokine production. In contrast, high amount (100 μg) of LPS enhanced the therapeutic efficacy of neu DNA vaccine with an increase of cytotoxic T lymphocyte response and Th1 immune response. The effect of LPS on DNA vaccine was diminished when the tumor was grown in toll-like receptor 4 (TLR4)mutant C3H/HeJ mice. Our results indicate that variation in the LPS doses exerts opposing effects on the therapeutic efficacy of DNA vaccine, and the observed effect is TLR4 dependent.

Original languageEnglish
Pages (from-to)151-157
Number of pages7
JournalDNA and Cell Biology
Volume27
Issue number3
DOIs
Publication statusPublished - 2008 Mar 1

All Science Journal Classification (ASJC) codes

  • Molecular Biology
  • Genetics
  • Cell Biology

Fingerprint Dive into the research topics of 'The opposing effects of lipopolysaccharide on the antitumor therapeutic efficacy of DNA vaccine'. Together they form a unique fingerprint.

  • Cite this