Antigen expression determines adenoviral vaccine potency independent of IFN and STING signaling

Kylie M. Quinn, Daniel E. Zak, Andreia Costa, Ayako Yamamoto, Kathrin Kastenmuller, Brenna J. Hill, Geoffrey M. Lynn, Patricia A. Darrah, Ross W B Lindsay, Lingshu Wang, Cheng Cheng, Alfredo Nicosia, Antonella Folgori, Stefano Colloca, Riccardo Cortese, Emma Gostick, David A. Price, Jason G D Gall, Mario Roederer, Alan AderemRobert A. Seder

Research output: Contribution to journalArticleResearchpeer-review

48 Citations (Scopus)

Abstract

Recombinant adenoviral vectors (rAds) are lead vaccine candidates for protection against a variety of pathogens, including Ebola, HIV, tuberculosis, and malaria, due to their ability to potently induce T cell immunity in humans. However, the ability to induce protective cellular immunity varies among rAds. Here, we assessed the mechanisms that control the potency of CD8 T cell responses in murine models following vaccination with human-, chimpanzee-, and simian-derived rAds encoding SIVGag antigen (Ag). After rAd vaccination, we quantified Ag expression and performed expression profiling of innate immune response genes in the draining lymph node. Human-derived rAd5 and chimpanzee-derived chAd3 were the most potent rAds and induced high and persistent Ag expression with low innate gene activation, while less potent rAds induced less Ag expression and robustly induced innate immunity genes that were primarily associated with IFN signaling. Abrogation of type I IFN or stimulator of IFN genes (STING) signaling increased Ag expression and accelerated CD8 T cell response kinetics but did not alter memory responses or protection. These findings reveal that the magnitude of rAd-induced memory CD8 T cell immune responses correlates with Ag expression but is independent of IFN and STING and provide criteria for optimizing protective CD8 T cell immunity with rAd vaccines.

Original languageEnglish
Pages (from-to)1129-1146
Number of pages18
JournalJournal of Clinical Investigation
Volume125
Issue number3
DOIs
Publication statusPublished - Mar 2015
Externally publishedYes

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