Immunogenicity of a candidate DNA vaccine based on the prM/E genes of a dengue type 2 virus cosmopolitan genotype strain

Dwi Hilda Putri, Tjahjani Mirawati Sudiro, Rina Yunita, Ungke Anton Jaya, Beti Ernawati Dewi, Fithriyah Sjatha, Eiji Konishi, Hak Hotta, Pratiwi Pudjilestari Sudarmono

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The development of a dengue virus vaccine is a major priority in efforts to control the diseases. Several researchers are currently using the Asian 1 and Asian 2 genotypes as vaccine candidates for dengue type 2 virus (DENV-2). However, in this study, we constructed a recombinant plasmid-based prM/E gene, from a DENV-2 Cosmopolitan genotype strain as a dengue DNA vaccine candidate. The protein expression of the recombinant plasmid in CHO cells was analyzed using an enzyme-linked immunosorbent assay, western blotting, and sucrose gradient sedimentation. After being used to immunize ddY mice three times at doses of 25 or 100 μg, the DNA vaccine induced humoral immune responses. There was no difference in the neutralizing antibody titer (focus reduction neutralization test 50z value) of mice immunized with 25 and 100 μg DNA vaccine doses. When challenged with 3 × 105 FFU DENV-2, immunized mice could raise anamnestic neutralizing antibody responses, which were observed at day 4 and day 8 post-challenge. Analysis of immunogenicity using BALB/c mice showed that their antibody neutralization titers were lower than those of ddY mice. In addition, the antibodies produced after immunization and challenge could also neutralize a DENV-2 Asian 2 genotype (New Guinea C) strain. Therefore, the DENV-2 Cosmopolitan genotype may be a DENV-2 vaccine candidate.

Original languageEnglish
Pages (from-to)357-363
Number of pages7
JournalJapanese Journal of Infectious Diseases
Volume68
Issue number5
DOIs
Publication statusPublished - 1 Jan 2015

Keywords

  • Cosmopolitan genotype
  • DENV-2
  • DNA vaccine
  • Immunogenicity

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