Prime-boost with alternating DNA vaccines designed to engage different antigen presentation pathways generates high frequencies of peptide-specific CD8+ T cells

The route for presentation of Ag to CD8+ or CD4+ T cells following DNA vaccination is critical for determining outcome, but the pathways involved are unclear. In this study, we compare two different DNA vaccine designs aimed to elicit CD8+ T cell responses against a specific peptide-epitope either by direct- or cross-presentation. Each carries sequences from tetanus toxin (TT) to provide essential CD4+ T cell help. In the first already proven design, the peptide-epitope is fused to the N-terminal domain of fragment C from TT. This appears to act mainly by cross-presentation. In the second design, the peptide-epitope is encoded by a minigene, with induction of Th responses mediated by coexpression of a hybrid invariant chain molecule, incorporating a single determinant from TT (p30) in exchange for class II-associated invariant chain peptide. This design appears to act mainly via direct presentation from transfected APCs. Both vaccines mediated Th-dependent priming of CD8+ T cells in mice, but the kinetics and level of the responses differed markedly, consistent with engagement of distinct pathways of Ag presentation. Importantly, the vaccines could be combined in an alternating prime-boost regime, in either order, generating substantially expanded memory CD8+ T cells, with potent effector function. Taken together, these results demonstrate that vaccination protocols involving different modes of Ag presentation at prime and boost can significantly improve the effectiveness of immunization.

presenting cells, cross-presentation, cell responses, sequence, cd8-t-cell memory, outcome, single, dendritic cells, dna, invariant chain peptide, plasmid dna, invariant chain, responses, tumor-antigen, peptide, protocol, pathway, antigen, induction, vaccination, antigen presentation, vaccines, cd4-t-cell help, cells, dna vaccines, genetic exchange, t cells, pathways, fragment c, cell, potent, t-cells, repair, immunization, time, t-cell, in-vivo, vaccine

0022-1767

6626-6633

http://www.jimmunol.org/cgi/content/abstract/177/1...

Radcliffe, Joanna N.

95bba459-28f5-46d5-b1f1-8e077f115e52

Roddick, Joanne S.

dddd0a9c-ef7a-4cb4-810d-8927ff1ce76f

Friedmann, Peter S.

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Stevenson, Freda K.

ba803747-c0ac-409f-a9c2-b61fde009f8c

Thirdborough, Stephen M.

161784fb-c8e3-4beb-86b1-cd8bc8ddf8de

15 November 2006

Radcliffe, Joanna N.

95bba459-28f5-46d5-b1f1-8e077f115e52

Roddick, Joanne S.

dddd0a9c-ef7a-4cb4-810d-8927ff1ce76f

Friedmann, Peter S.

d50bac23-f3ec-4493-8fa0-fa126cbeba88

Stevenson, Freda K.

ba803747-c0ac-409f-a9c2-b61fde009f8c

Thirdborough, Stephen M.

161784fb-c8e3-4beb-86b1-cd8bc8ddf8de

Radcliffe, Joanna N., Roddick, Joanne S., Friedmann, Peter S., Stevenson, Freda K. and Thirdborough, Stephen M. (2006) Prime-boost with alternating DNA vaccines designed to engage different antigen presentation pathways generates high frequencies of peptide-specific CD8+ T cells. Journal of Immunology, 177 (10), 6626-6633.

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Published date: 15 November 2006

Keywords: presenting cells, cross-presentation, cell responses, sequence, cd8-t-cell memory, outcome, single, dendritic cells, dna, invariant chain peptide, plasmid dna, invariant chain, responses, tumor-antigen, peptide, protocol, pathway, antigen, induction, vaccination, antigen presentation, vaccines, cd4-t-cell help, cells, dna vaccines, genetic exchange, t cells, pathways, fragment c, cell, potent, t-cells, repair, immunization, time, t-cell, in-vivo, vaccine