Epitope specificity of Th(o)/Th2 CD4+ T-lymphocyte clones induced by vaccination with rHBsAg vaccine

M. C. Honorati, P. Dolzani, E. Mariani, A. Piacentini, G. Lisignoli, C. Ferrari, A. Facchini

Research output: Contribution to journalArticle

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Abstract

Background and Aims: Different amine acid sequences of hepatitis B virus surface antigen (HBsAg) are involved in the activation of CD4+ lymphocytes needed to induce an optimal antiviral function. The aim of this study was to characterize the CD4-mediated response to immunodominant HBsAg epitopes in hepatitis B virus (HBV) vaccine recipients by defining minimal sequences recognized by T cells, cytokine profiles, and HLA restriction of peptide recognition. Methods: T-lymphocyte lines and clones specific for HBsAg were isolated from the peripheral blood of subjects immunized with recombinant HBsAg and stimulated in vitro with synthetic peptides spanning the whole HBsAg sequence. Results: Four immunodominant epitopes (sequences 21-40, 136- 155, 156-175, and 211-226) were identified. Using panels of truncated peptides of different length, sequences 21-28, 165-172, and 215-223 were shown to correspond to the minimal epitopes recognized by T cells. The antigen-specific T-lymphocyte proliferation was HLA class II restricted, and each peptide could be presented in association with different HLA class II determinants. Th(o)/Th2 cytokine patterns were induced on peptide stimulation. Conclusions: These results Indicate the presence of at least four immunodominant epitopes within HBsAg that represent potential candidates for the design of anti-HBV synthetic vaccines.

Original languageEnglish
Pages (from-to)2017-2027
Number of pages11
JournalGastroenterology
Volume112
Issue number6
DOIs
Publication statusPublished - 1997

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Hepatitis B virus
Epitopes
Vaccination
Vaccines
Hepatitis B Surface Antigens
Clone Cells
T-Lymphocytes
Peptides
Immunodominant Epitopes
Cytokines
Hepatitis B Vaccines
Synthetic Vaccines
T-Lymphocyte Epitopes
Lymphocyte Activation
Amines
Antiviral Agents
Antigens
Acids

ASJC Scopus subject areas

  • Gastroenterology

Cite this

Epitope specificity of Th(o)/Th2 CD4+ T-lymphocyte clones induced by vaccination with rHBsAg vaccine. / Honorati, M. C.; Dolzani, P.; Mariani, E.; Piacentini, A.; Lisignoli, G.; Ferrari, C.; Facchini, A.

In: Gastroenterology, Vol. 112, No. 6, 1997, p. 2017-2027.

Research output: Contribution to journalArticle

Honorati, M. C. ; Dolzani, P. ; Mariani, E. ; Piacentini, A. ; Lisignoli, G. ; Ferrari, C. ; Facchini, A. / Epitope specificity of Th(o)/Th2 CD4+ T-lymphocyte clones induced by vaccination with rHBsAg vaccine. In: Gastroenterology. 1997 ; Vol. 112, No. 6. pp. 2017-2027.
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