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Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.
Protein-prime/modified vaccinia virus Ankara vector-boost vaccination overcomes tolerance in high-antigenemic HBV-transgenic mice.
Vaccine 34, 923-932 (2016)
BACKGROUND: Therapeutic vaccination is a novel treatment approach for chronic hepatitis B, but only had limited success so far. We hypothesized that optimized vaccination schemes have increased immunogenicity, and aimed at increasing therapeutic hepatitis B vaccine efficacy. METHODS: Modified Vaccinia virus Ankara (MVA) expressing hepatitis B virus (HBV) antigens was used to boost protein-prime vaccinations in wildtype and HBV-transgenic (HBVtg) mice. RESULTS: Protein-prime/MVA-boost vaccination was able to overcome HBV-specific tolerance in HBVtg mice with low and medium but not with high antigenemia. HBV-specific antibody titers, CD8+ T-cell frequencies and polyfunctionality inversely correlated with HBV antigen levels. However, optimization of the adjuvant formulation, increasing the level of antigen expression and utilization of HBsAg of heterologous subtype induced HBV-specific CD8+ and CD4+ T-cells and neutralizing antibodies even in high-antigenemic HBVtg mice. CONCLUSIONS: Our results indicate that high HBV antigen levels limit the immunological responsiveness to therapeutic vaccination but optimization of the vaccine formulation can overcome tolerance even in the presence of high antigenemia. These findings have important implications for the development of future therapeutic hepatitis B vaccination strategies and potentially also for the stratification of chronic hepatitis B patients for therapeutic vaccination.
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Publikationstyp
Artikel: Journalartikel
Dokumenttyp
Wissenschaftlicher Artikel
Schlagwörter
Hepatitis B Virus ; Heterologous Prime/boost Strategy ; Recombinant Mva ; Therapeutic Vaccination ; Tolerance; Hepatitis-b-virus; Cytotoxic T-lymphocytes; Surface-antigen; In-vivo; Immune-responses; Dendritic Cells; Infection; Lamivudine; Immunization; Replication
ISSN (print) / ISBN
0264-410X
e-ISSN
1358-8745
Zeitschrift
Vaccine
Quellenangaben
Band: 34,
Heft: 7,
Seiten: 923-932
Verlag
Elsevier
Verlagsort
Oxford
Nichtpatentliteratur
Publikationen
Begutachtungsstatus
Peer reviewed
Institut(e)
Institute of Virology (VIRO)