Effect of epitope variant co-delivery on the depth of CD8 T&nbsp;cell responses induced by HIV-1 conserved mosaic vaccines

Wee, Edmund G.; Moyo, Nathifa; Hannoun, Zara; Giorgi, Elena E.; Korber, Bette; Hanke, Tomáš

doi:10.1016/j.omtm.2021.04.018

Effect of epitope variant co-delivery on the depth of CD8 T cell responses induced by HIV-1 conserved mosaic vaccines

Journal Article · Wed May 05 00:00:00 EDT 2021 · Molecular Therapy. Methods & Clinical Development

DOI:https://doi.org/10.1016/j.omtm.2021.04.018· OSTI ID:1815790

Wee, Edmund G. ^[1]; Moyo, Nathifa ^[2]; Hannoun, Zara ^[2]; ^[3]; Korber, Bette ^[4]; ^[5]

Univ. of Oxford (United Kingdom). Nuffield Dept. of Medicine. The Jenner Inst.; OSTI
Univ. of Oxford (United Kingdom). Nuffield Dept. of Medicine. The Jenner Inst.
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); New Mexico Consortium, Los Alamos, NM (United States)
Univ. of Oxford (United Kingdom). Nuffield Dept. of Medicine. The Jenner Inst.; Kumamoto Univ. (Japan). Joint Research Center for Human Retrovirus Infection

To stop the HIV-1 pandemic, vaccines must induce responses capable of controlling vast HIV-1 variants circulating in the population as well as those evolved in each individual following transmission. Numerous strategies have been proposed, of which the most promising include focusing responses on the vulnerable sites of HIV-1 displaying the least entropy among global isolates and using algorithms that maximize vaccine match to circulating HIV-1 variants by vaccine cocktails of optimized complementing sequences. In this study, we investigated CD8 T cell responses induced by a bi-valent mosaic of highly conserved HIVconsvX regions delivered by a combination of simian adenovirus ChAdOx1 and poxvirus MVA. We compared partially and fully mono- and bi-valent prime-boost regimens and their ability to elicit T cells recognizing natural epitope variants using an interferon-g enzyme-linked immunospot (ELISPOT) assay. We used 11 well-defined CD8 T cell epitopes in two mouse haplotypes and, for each epitope, assessed recognition of the two vaccine forms together with the other most frequent epitope variants in the HIV-1 database. We conclude that for the magnitude and depth of epitope recognition, CD8 T cell responses benefitted in most comparisons from the combined bi-valent mosaic and envisage the main advantage of the bi-valent vaccine during its deployment to diverse populations.

View Accepted Manuscript (DOE)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1815790

Journal Information:: Molecular Therapy. Methods & Clinical Development, Journal Name: Molecular Therapy. Methods & Clinical Development Journal Issue: C Vol. 21; ISSN 2329-0501

Publisher:: Cell PressCopyright Statement

Country of Publication:: United States

Language:: English

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