TY - JOUR
T1 - Breaking tolerance in hepatitis B surface antigen (HBsAg) transgenic mice by vaccination with cross-reactive, natural HBsAg variants
AU - Schirmbeck, Reinhold
AU - Dikopoulos, Nektarios
AU - Kwissa, Marcin
AU - Leithäuser, Frank
AU - Lamberth, Kasper
AU - Buus, Søren
AU - Melber, Karl
AU - Reimann, Jörg
N1 - Keywords: Adoptive Transfer; Amino Acid Sequence; Animals; CD8-Positive T-Lymphocytes; Cell Line; Cross Reactions; Epitopes; Hepatitis B Antibodies; Hepatitis B Surface Antigens; Hepatitis B, Chronic; Immune Tolerance; Liver; Mice; Mice, Inbred C57BL; Mice, Transgenic; Molecular Sequence Data; Spleen; Vaccination
PY - 2003
Y1 - 2003
N2 - Processing exogenous hepatitis B surface antigen (HBsAg) of the hepatitis B virus (HBV) generates the K(b)-binding S(208-215) epitope 1; processing endogenous HBsAg generates the K(b)-binding S(190-197) epitope 2. Cross-reactive CD8(+) T cell responses were primed to epitope 1 but not epitope 2 when mice were immunized with natural HBsAg(ayw), or HBsAg(adw2) variants differing within both epitopes by one or two residues. Expression of HBsAg(ayw) from a transgene in the liver renders (HBs-tg) mice tolerant to epitope 1 of HBsAg(ayw). CD8(+) T cells specific for epitope 1 could be primed in HBs-tg mice by HBsAg(adw2); these specific CD8(+) T cells cross-reacted with epitope 1 processed from the transgene-encoded HBsAg(ayw). The liver of vaccinated HBsAg(ayw) transgenic mice showed severe histopathology and contained functional (IFNgamma-producing), cross-reactive CD8(+) T cells, and vaccinated HBs-tg mice showed reduced antigenemia. Hence, vaccination with natural HBsAg variants from different HBV sero/genotypes can prime cross-reactive, specific CD8(+) T cell immunity that breaks tolerance to HBsAg.
AB - Processing exogenous hepatitis B surface antigen (HBsAg) of the hepatitis B virus (HBV) generates the K(b)-binding S(208-215) epitope 1; processing endogenous HBsAg generates the K(b)-binding S(190-197) epitope 2. Cross-reactive CD8(+) T cell responses were primed to epitope 1 but not epitope 2 when mice were immunized with natural HBsAg(ayw), or HBsAg(adw2) variants differing within both epitopes by one or two residues. Expression of HBsAg(ayw) from a transgene in the liver renders (HBs-tg) mice tolerant to epitope 1 of HBsAg(ayw). CD8(+) T cells specific for epitope 1 could be primed in HBs-tg mice by HBsAg(adw2); these specific CD8(+) T cells cross-reacted with epitope 1 processed from the transgene-encoded HBsAg(ayw). The liver of vaccinated HBsAg(ayw) transgenic mice showed severe histopathology and contained functional (IFNgamma-producing), cross-reactive CD8(+) T cells, and vaccinated HBs-tg mice showed reduced antigenemia. Hence, vaccination with natural HBsAg variants from different HBV sero/genotypes can prime cross-reactive, specific CD8(+) T cell immunity that breaks tolerance to HBsAg.
U2 - 10.1002/eji.200324403
DO - 10.1002/eji.200324403
M3 - Journal article
C2 - 14635042
SN - 0014-2980
VL - 33
SP - 3342
EP - 3352
JO - European Journal of Immunology
JF - European Journal of Immunology
IS - 12
ER -
