JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Regulation of hepatitis B virus mRNA expression in a hepatitis B surface antigen transgenic mouse model by IFN-gamma-secreting T cells after DNA-based immunization.

Journal of Immunology 1998 November 16
The immunotherapeutic effect of DNA-mediated immunization against chronic hepatitis B virus (HBV) infection has been evaluated in transgenic mice expressing the sequences that code for the envelope proteins of HBV in the liver. In this model of HBV chronic carriers, a single i.m. injection of plasmid DNA encoding HBV envelope proteins is sufficient to generate specific immune responses leading to the clearance of the transgene expression product and the control of HBV mRNA. The relative contributions of the T cell subpopulations induced by DNA immunization were examined using adoptive transfer experiments. It was shown that either CD8+ or CD4+ T lymphocytes from immunocompetent DNA-immunized animals were sufficient to control viral gene expression in the livers of the recipient transgenic mice. This effect was mediated by a cytokine-dependent mechanism common to both T cell subpopulations; this mechanism did not require cell lysis, but did involve the production of IFN-gamma by the activated T cells.

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