Abstract
The rational development of peptide vaccines requires the identification of both B- and T-cell epitopes. In this study, potential T-helper cell epitopes of Semliki Forest virus (SFV) were identified on the basis of their ability to induce delayed-type hypersensitivity (DTH) in mice using recombinant SFV fragments produced as hybrid proteins with beta-galactosidase in Escherichia coli and synthetic peptides coupled to beta-galactosidase. Although the tested fragments spanned almost the entire amino acid sequence of the structural proteins of SFV, only one DTH-inducing region (located between amino acid 137 and 151 of the SFV E2 membrane protein) was identified. Peptides containing this E2 region stimulated lymph node cells from SFV-primed mice in vitro. The ability of the identified T-cell epitope to induce a specific T-helper response in mice was evaluated using synthetic peptides that contained combinations of the DTH-inducing region and different previously identified linear B-cell epitopes of E2. These peptides proved able to induce an antipeptide IgG response in mice in an H-2d-restricted fashion. One of the peptides was also able to induce high titres of IgG reactive with SFV-infected cells and protected 70-100% of the peptide-immunized mice after challenge with virulent SFV. Our findings suggest that DTH and T-helper activity are mediated by different doses of the same T-cell epitope.
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Selected References
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