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Unité de Recombinaison et Expression Génétique, Institut National de la Santé et de la Recherche Médicale, Unité 163, Institut Pasteur, Paris, France;
IDM, Immuno-Designed Molecules, Paris, France; and
Unité dImmunité Cellulaire Antivirale, Institut Pasteur, Paris, France
CTL together with anti-envelope Abs represent major effectors
for viral clearance during hepatitis B virus (HBV) infection. The
induction of strong cytotoxic and Ab responses against the envelope
proteins after DNA-based immunization has been proposed as a promising
therapeutic approach to mediate viral clearance in chronically infected
patients. Here, we studied the CTL responses against previously
described hepatitis B surface Ag (HBsAg)-HLA-A*0201-restricted epitopes
after DNA-based immunization in HLA-A*0201 transgenic mice. The animal
model used was Human Human Db (HHD) mice, which are
deficient for mouse MHC class I molecules
(ß2-microglobulin-/- Db-/-)
and transgenic for a chimeric HLA-A*0201/Db molecule
covalently bound to the human ß2-microglobulin
(HHD+/+). Immunization of these mice with a
DNA vector encoding the small and the middle HBV envelope proteins
carrying HBsAg induced CTL responses against several epitopes in each
animal. This study performed on a large number of animals described
dominant epitopes with specific CTL induced in all animals and others
with a weaker frequency of recognition. These results confirmed the
relevance of the HHD transgenic mouse model in the assessment of
vaccine constructs for human use. Moreover, genetic immunization of
HLA-A2 transgenic mice generates IFN-
-secreting CD8+ T
lymphocytes specific for endogenously processed peptides and with
recognition specificities similar to those described during
self-limited infection in humans. This suggests that responses induced
by DNA immunization could have the same immune potential as those
developing during natural HBV infection in human
patients.
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