Dysfunctional CD8+ T cells present in chronic virus infections can express programmed death 1 (PD-1) molecules, and the inhibition of the engagement of PD-1 with its ligand (PD-L1) has been reported to enhance the antiviral function of these T cells. We took advantage of the wide fluctuations in levels of viremia which are typical of chronic hepatitis B virus (HBV) infection to comprehensively analyze the impact of prolonged exposure to different virus quantities on virus-specific T-cell dysfunction and on its reversibility through the blocking of the PD-1/PD-L1 pathway. We confirm that chronic HBV infection has a profound effect on the HBV-specific T-cell repertoire. Despite the use of a comprehensive panel of peptides covering all HBV proteins, HBV-specific T cells were rarely observed directly ex vivo in samples from patients with chronic infection, in contrast to those from patients with acute HBV infection. In chronic HBV infection, virus-specific T cells were detected mainly in patients with lower levels off viremia. These HBV-specific CD8+ T cells expressed PD-1, and their function was improved by the blocking of PD-1/PD-L1 engagement. Thus, a broad spectrum of anti-HBV immunity is expressed by patients with chronic HBV infection and this spectrum is proportional to HBV replication levels and can be improved by blocking the PD-1/PD-L1 pathway. This information may be useful for the design of immunotherapeutic strategies to complement and optimize available antiviral therapies. Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Characterization of hepatitis B virus (HBV)-specific T-cell dysfunction in chronic HBV infection / Boni, Carolina; Fisicaro, Paola; Valdatta, Caterina; Amadei, Barbara; Di Vincenzo, Paola; Giuberti, Tiziana; Laccabue, Diletta; Zerbini, Alessandro; Cavalli, Albertina; Missale, Gabriele; Bertoletti, Antonio; Ferrari, Carlo. - In: JOURNAL OF VIROLOGY. - ISSN 0022-538X. - 81:8(2007), pp. 4215-4225. [10.1128/JVI.02844-06]

Characterization of hepatitis B virus (HBV)-specific T-cell dysfunction in chronic HBV infection

Missale, Gabriele;FERRARI, Carlo
2007

Abstract

Dysfunctional CD8+ T cells present in chronic virus infections can express programmed death 1 (PD-1) molecules, and the inhibition of the engagement of PD-1 with its ligand (PD-L1) has been reported to enhance the antiviral function of these T cells. We took advantage of the wide fluctuations in levels of viremia which are typical of chronic hepatitis B virus (HBV) infection to comprehensively analyze the impact of prolonged exposure to different virus quantities on virus-specific T-cell dysfunction and on its reversibility through the blocking of the PD-1/PD-L1 pathway. We confirm that chronic HBV infection has a profound effect on the HBV-specific T-cell repertoire. Despite the use of a comprehensive panel of peptides covering all HBV proteins, HBV-specific T cells were rarely observed directly ex vivo in samples from patients with chronic infection, in contrast to those from patients with acute HBV infection. In chronic HBV infection, virus-specific T cells were detected mainly in patients with lower levels off viremia. These HBV-specific CD8+ T cells expressed PD-1, and their function was improved by the blocking of PD-1/PD-L1 engagement. Thus, a broad spectrum of anti-HBV immunity is expressed by patients with chronic HBV infection and this spectrum is proportional to HBV replication levels and can be improved by blocking the PD-1/PD-L1 pathway. This information may be useful for the design of immunotherapeutic strategies to complement and optimize available antiviral therapies. Copyright © 2007, American Society for Microbiology. All Rights Reserved.
Characterization of hepatitis B virus (HBV)-specific T-cell dysfunction in chronic HBV infection / Boni, Carolina; Fisicaro, Paola; Valdatta, Caterina; Amadei, Barbara; Di Vincenzo, Paola; Giuberti, Tiziana; Laccabue, Diletta; Zerbini, Alessandro; Cavalli, Albertina; Missale, Gabriele; Bertoletti, Antonio; Ferrari, Carlo. - In: JOURNAL OF VIROLOGY. - ISSN 0022-538X. - 81:8(2007), pp. 4215-4225. [10.1128/JVI.02844-06]
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11381/2814923
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