Liver international : official journal of the International Association for the Study of the Liver · 2017
Hepatitis E virus ORF 1 induces proliferative and functional T-cell responses in patients with ongoing and resolved hepatitis E.
Сравнительное исследованиеСтатьяПоддержка исследования: вне правительства СШАНазвание и аннотация: Перевод в очереди
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Al-Ayoubi Jana, Behrendt Patrick, Bremer Birgit, Suneetha Pothakamuri Venkata, Gisa Anett, Rinker Franziska, Manns Michael P, Cornberg Markus, Wedemeyer Heiner, Kraft Anke R M
Аннотация
BACKGROUND AND AIMS: Hepatitis E virus (HEV) is a major cause of acute viral hepatitis with >3 million symptomatic cases per year accounting for 70 000 HEV-related deaths. HEV-specific T-cell responses have been investigated against structural proteins expressed by open reading frames (ORF) 2 and 3. T-cell responses against non-structural HEV proteins encoded by ORF1 are hardly studied. The aim of this study was to determine HEV ORF1-specific T-cell responses in comparison to ORF2/3 in patients exposed to HEV.
METHODS: HEV-specific CD4+ and CD8+ T-cell responses against HEV genotype 3 were investigated in patients with acute and chronic hepatitis E as well as in HEV seropositive and seronegative individuals. HEV-specific T-cell responses were determined by proliferation and intracellular cytokine assay upon stimulation of PBMCs with HEV-specific overlapping peptide pools spanning the entire HEV genome. HEV-antigen was measured using an anti-HEV antigen-specific ELISA.
RESULTS: Broad HEV ORF1-specific T-cell responses were detected in patients with acute, resolved and chronic hepatitis E without distinct dominant regions. The magnitude and frequency in recognition of ORF1-specific T-cell responses were similar compared to responses against HEV ORF2/3. Longitudinal studies of HEV-specific T-cell responses displayed similar behaviour against structural and non-structural proteins. HEV-antigen levels were inversely correlated with HEV-specific T-cell responses.
CONCLUSIONS: HEV-specific T-cell responses are detectable against the entire HEV genome including the non-structural proteins. HEV-specific T-cell responses are associated with control of HEV infection. These findings have implications for the design of HEV vaccines.
METHODS: HEV-specific CD4+ and CD8+ T-cell responses against HEV genotype 3 were investigated in patients with acute and chronic hepatitis E as well as in HEV seropositive and seronegative individuals. HEV-specific T-cell responses were determined by proliferation and intracellular cytokine assay upon stimulation of PBMCs with HEV-specific overlapping peptide pools spanning the entire HEV genome. HEV-antigen was measured using an anti-HEV antigen-specific ELISA.
RESULTS: Broad HEV ORF1-specific T-cell responses were detected in patients with acute, resolved and chronic hepatitis E without distinct dominant regions. The magnitude and frequency in recognition of ORF1-specific T-cell responses were similar compared to responses against HEV ORF2/3. Longitudinal studies of HEV-specific T-cell responses displayed similar behaviour against structural and non-structural proteins. HEV-antigen levels were inversely correlated with HEV-specific T-cell responses.
CONCLUSIONS: HEV-specific T-cell responses are detectable against the entire HEV genome including the non-structural proteins. HEV-specific T-cell responses are associated with control of HEV infection. These findings have implications for the design of HEV vaccines.