Abstract:
:Currently, no vaccine exists for hepatitis C virus (HCV), a major pathogen thought to infect 170 million people globally. Many studies suggest that host T cell responses are critical for spontaneous resolution of disease, and preclinical studies have indicated a requirement for T cells in protection against challenge. We aimed to elicit HCV-specific T cells with the potential for protection using a recombinant adenoviral vector strategy in a phase 1 study of healthy human volunteers. Two adenoviral vectors expressing NS proteins from HCV genotype 1B were constructed based on rare serotypes [human adenovirus 6 (Ad6) and chimpanzee adenovirus 3 (ChAd3)]. Both vectors primed T cell responses against HCV proteins; these T cell responses targeted multiple proteins and were capable of recognizing heterologous strains (genotypes 1A and 3A). HCV-specific T cells consisted of both CD4+ and CD8+ T cell subsets; secreted interleukin-2, interferon-γ, and tumor necrosis factor-α; and could be sustained for at least a year after boosting with the heterologous adenoviral vector. Studies using major histocompatibility complex peptide tetramers revealed long-lived central and effector memory pools that retained polyfunctionality and proliferative capacity. These data indicate that an adenoviral vector strategy can induce sustained T cell responses of a magnitude and quality associated with protective immunity and open the way for studies of prophylactic and therapeutic vaccines for HCV.
journal_name
Sci Transl Medjournal_title
Science translational medicineauthors
Barnes E,Folgori A,Capone S,Swadling L,Aston S,Kurioka A,Meyer J,Huddart R,Smith K,Townsend R,Brown A,Antrobus R,Ammendola V,Naddeo M,O'Hara G,Willberg C,Harrison A,Grazioli F,Esposito ML,Siani L,Traboni C,Oo Ydoi
10.1126/scitranslmed.3003155subject
Has Abstractpub_date
2012-01-04 00:00:00pages
115ra1issue
115eissn
1946-6234issn
1946-6242pii
4/115/115ra1journal_volume
4pub_type
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