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Characterization of the humoral and cellular immune responses against hepatitis C virus core induced by DNA-based

G J Hu1, R Y Wang, D S Han

  • 1Department of Transfusion Medicine, Warren G. Magnuson Clinical Center, National Institutes of Health, Bethesda, MD 20892-1184, USA.

Vaccine
|August 26, 1999
PubMed

Insights

DNA-based immunization shows promise for Hepatitis C Virus (HCV) infection. Vaccination with HCV-core DNA sequences effectively induced humoral and cellular immune responses, suggesting a potential new vaccine strategy.

Area of Science:

  • Immunology
  • Virology
  • Vaccine Development

Background:

  • Hepatitis C Virus (HCV) is a major cause of posttransfusion hepatitis, leading to chronic liver disease, cirrhosis, and hepatocellular carcinoma.
  • Current therapies for HCV are minimally effective, and no vaccine is currently available.
  • DNA-based immunization presents a potential prophylactic and therapeutic strategy for HCV infection.

Purpose of the Study:

  • To evaluate the efficacy of DNA-based immunization with a Hepatitis C Virus (HCV) recombinant plasmid in inducing humoral and cellular immune responses.
  • To investigate the potential of boosting with recombinant HCV-core protein to enhance immune responses.
  • To characterize the nature of the immune response, including T helper cell priming and cytotoxic T lymphocyte (CTL) activity.

Main Methods:

  • BALB/c mice were intramuscularly inoculated with an HCV recombinant plasmid (pCI-HCV-C).
  • Mice were boosted with recombinant HCV-core protein (cp1-10).
  • Humoral responses (IgM, IgG), spleen cell proliferation, T cell phenotypes (CD4+, CD8+), and cytotoxic T lymphocyte (CTL) activity were assessed using methods including Western-blotting, proliferation blocking assays, and 51Cr-release assays.

Main Results:

  • pCI-HCV-C immunization induced significant IgM but not IgG antibodies.
  • Boosting with cp1-10 rapidly increased anticore IgG levels and spleen cell proliferation.
  • Specific T helper cell priming (CD4+ CD8-) and MHC class I-restricted CTL responses (CD4- CD8+) against HCV-core were demonstrated, with three CTL epitopes identified.

Conclusions:

  • DNA-based vaccination with HCV-core derived DNA sequences is effective in inducing both humoral and cellular immune responses.
  • This approach holds potential as a vaccination strategy for Hepatitis C Virus infection.
  • The study highlights the importance of boosting with core protein to achieve robust IgG responses and CTL activity.

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