Abstract
Although much effort has been expended on evaluating recombinant proteins and synthetic peptides as immunogens, they have generally proved incapable of inducing an efficient cytotoxic T-cell (CTL) response. Filamentous bacteriophage fd can display multiple copies of foreign peptides in the N-terminal region of its major coat protein pVIII, 2,700 copies of which make up the virus capsid. Here we show that fd virions displaying peptide RT2 (ILKEPVHGV), corresponding to residues 309–317 of the reverse transcriptase (RTase) of HIV-1, are able to prime a CTL response specific for this HIV-1 epitope in human cell lines. Successful priming also requires a T-helper epitope, pep23 (KDSWTVNDIQKLVGK), corresponding to residues 249–263 of HIV-1 RTase. Supplying this by displaying it on either the same or a separate bacteriophage virion led to activation of antigen-specific CD4+ T cells. Likewise, HLA-A2 transgenic mice immunized with bacteriophage virions displaying peptide RT2 were shown to mount an effective, specific anti-HIV-RT2 CTL response. This unexpected ability to elicit a designated cytolytic T-cell response, in addition to a B-cell response, has important implications for access to the class I major histocompatibility complex (MHC) loading compartment and the development of recombinant vaccines.
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Acknowledgements
This research was supported by a grant from the European Union to J.G. and R.N.P., from ISS II Progetto AIDS to J.G., and from CNR P.F. Biotecnologia to G.D.P. The core facilities of the Cambridge Centre for Molecular Recognition are supported by the Biotechnology and Biological Sciences Research Council and The Wellcome Trust. We thank P. Barba and C. Sole for excellent technical assistance.
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De Berardinis, P., Sartorius, R., Fanutti, C. et al. Phage display of peptide epitopes from HIV-1 elicits strong cytolytic responses. Nat Biotechnol 18, 873–876 (2000). https://doi.org/10.1038/78490
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DOI: https://doi.org/10.1038/78490
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