Synthetic DNA immunogen encoding hepatitis B core antigen drives immune response in liver

Cancer Gene Ther. 2012 Nov;19(11):779-87. doi: 10.1038/cgt.2012.61. Epub 2012 Oct 5.

Abstract

The prevalence of hepatitis B virus (HBV) infection in Asia and sub-Sahara Africa is alarming. With quarter of a billion people chronically infected worldwide and at risk of developing liver cancer, the need for a prophylactic or therapeutic vaccination approach that can effectively induce protective responses against the different genotypes of HBV is more important than ever. Such a strategy will require both the induction of a strong antigen-specific immune response and the subsequent deployment of immune response towards the liver. Here, we assessed the ability of a synthetic DNA vaccine encoding a recombinant consensus plasmid from genotype A through E of the HBV core antigen (HBcAg), to drive immunity in the liver. Intramuscular vaccination induced both strong antigen-specific T cell and high titer antibody responses systematically and in the liver. Furthermore, immunized mice showed strong cytotoxic responses that eliminate adoptively transferred HBV-coated target cells. Importantly, vaccine-induced immune responses provided protection from HBcAg plasmid-based liver transfection in a hydrodynamic liver transfection model. These data provide important insight into the generation of peripheral immune responses that are recruited to the liver-an approach that can be beneficial in the search for vaccines or immune-therapies to liver disease.

MeSH terms

  • Administration, Intranasal
  • Animals
  • Antibody Formation
  • CD8-Positive T-Lymphocytes / immunology
  • CD8-Positive T-Lymphocytes / virology
  • DNA, Viral / administration & dosage
  • DNA, Viral / genetics
  • DNA, Viral / immunology*
  • Enzyme-Linked Immunospot Assay
  • Female
  • Genes, Viral
  • Genotype
  • Hepatitis B / immunology
  • Hepatitis B / therapy
  • Hepatitis B Core Antigens / administration & dosage
  • Hepatitis B Core Antigens / genetics
  • Hepatitis B Core Antigens / immunology*
  • Hepatitis B Vaccines / administration & dosage
  • Hepatitis B Vaccines / genetics
  • Hepatitis B Vaccines / immunology*
  • Hepatitis B virus / genetics
  • Hepatitis B virus / immunology
  • Hepatocytes / immunology
  • Hepatocytes / virology
  • Liver / immunology*
  • Liver / virology
  • Mice
  • Mice, Inbred BALB C
  • Plasmids / metabolism
  • Transfection
  • Vaccination / methods
  • Vaccines, DNA / administration & dosage
  • Vaccines, DNA / immunology*

Substances

  • DNA, Viral
  • Hepatitis B Core Antigens
  • Hepatitis B Vaccines
  • Vaccines, DNA