Comparative Immunogenicity in Rabbits of the Polypeptides Encoded by the 5′ Terminus of Hepatitis C Virus RNA

Irina Sominskaya, Juris Jansons, Anastasija Dovbenko, Natalia Petrakova, Ilva Lieknina, Marija Mihailova, Oleg Latyshev, Olesja Eliseeva, Irina Stahovska, Inara Akopjana, Ivars Petrovskis, Maria Isaguliants

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Recent studies on the primate protection from HCV infection stressed the importance of immune response against structural viral proteins. Strong immune response against nucleocapsid (core) protein was difficult to achieve, requesting further experimentation in large animals. Here, we analyzed the immunogenicity of core aa 1-173, 1-152, and 147-191 and of its main alternative reading frame product F-protein in rabbits. Core aa 147-191 was synthesized; other polypeptides were obtained by expression in E. coli. Rabbits were immunized by polypeptide primes followed by multiple boosts and screened for specific anti-protein and anti-peptide antibodies. Antibody titers to core aa 147-191 reached 105; core aa 1-152, 5 × 105; core aa 1-173 and F-protein, 106. Strong immunogenicity of the last two proteins indicated that they may compete for the induction of immune response. The C-terminally truncated core was also weakly immunogenic on the T-cell level. To enhance core-specific cellular response, we immunized rabbits with the core aa 1-152 gene forbidding F-protein formation. Repeated DNA immunization induced a weak antibody and sustained proliferative response of broad specificity confirming a gain of cellular immunogenicity. Epitopes recognized in rabbits overlapped those in HCV infection. Our data promotes the use of rabbits for the immunogenicity tests of prototype HCV vaccines.

Original languageEnglish
Article number762426
JournalJournal of Immunology Research
Volume2015
DOIs
Publication statusPublished - 2015

Field of Science

  • 1.6 Biological sciences
  • 3.1 Basic medicine

Publication Type

  • 1.1. Scientific article indexed in Web of Science and/or Scopus database

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