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• W1922233425 endingPage "4243" @default.
• W1922233425 startingPage "4235" @default.
• W1922233425 abstract "Different protein- or DNA-based vaccination techniques are available that prime potent humoral and cellular, T1 or T2 immune responses to the hepatitis B surface Ag (HBsAg) in mice. T1 and T2 are immune responses with isotype profile indicating Th1 and Th2 immunoregulation. We tested whether HBsAg-specific immune responses can be established in transgenic mice that express HBsAg in the liver (HBs-tg mice) using either these different vaccination techniques or an adoptive transfer system. HBsAg-specific responses could not be primed in HBs-tg mice with the established, potent vaccine delivery techniques. In contrast, adoptive transfers of T1- and T2-type HBsAg-immune spleen cells into congenic HBs-tg hosts (that were not conditioned by pretreatment) suppressed HBsAg antigenemia and gave rise to HBsAg-specific serum Ab titers. The establishment of continuously rising anti-HBsAg serum Ab levels with alternative isotype profiles (reflecting T1 or T2 polarization) in transplanted HBs-tg hosts required donor CD4+ T cell-dependent restimulation of adoptively transferred immune cells by transgene-derived HBsAg. Injections of HBsAg-specific Abs into HBs-tg mice did not establish stable humoral immunity. The expanding T1 or T2 immune responses to HBsAg in HBs-tg hosts did not suppress transgene-directed HBsAg expression in the liver and did not induce liver injury. In addition to priming functional antiviral effector cells, the conditioning of the liver microenvironment to enable delivery of antiviral effector functions to this organ are therefore critical for effective antiviral defense. A major challenge in the development of a therapeutic vaccine against chronic hepatitis B or C virus infection is thus the efficient targeting of specifically induced immune effector specificities to the liver." @default.
• W1922233425 created "2016-06-24" @default.
• W1922233425 creator A5004916033 @default.
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• W1922233425 date "2000-04-15" @default.
• W1922233425 modified "2023-10-18" @default.
• W1922233425 title "Ongoing Murine T1 or T2 Immune Responses to the Hepatitis B Surface Antigen Are Excluded from the Liver that Expresses Transgene-Encoded Hepatitis B Surface Antigen" @default.
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• W1922233425 doi "https://doi.org/10.4049/jimmunol.164.8.4235" @default.
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• W1922233425 hasPublicationYear "2000" @default.
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