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• W2326827096 abstract "Hepatitis B virus (HBV) persistence is facilitated by exhaustion of CD8 T cells that express the inhibitory receptor programmed cell death-1 (PD-1). Improvement of the HBV-specific T cell function has been obtained in vitro by inhibiting the PD-1/PD-ligand 1 (PD-L1) interaction. In this study, we examined whether in vivo blockade of the PD-1 pathway enhances virus-specific T cell immunity and leads to the resolution of chronic hepadnaviral infection in the woodchuck model. The woodchuck PD-1 was first cloned, characterized, and its expression patterns on T cells from woodchucks with acute or chronic woodchuck hepatitis virus (WHV) infection were investigated. Woodchucks chronically infected with WHV received a combination therapy with nucleoside analogue entecavir (ETV), therapeutic DNA vaccination and woodchuck PDL1 antibody treatment. The gain of T cell function and the suppression of WHV replication by this therapy were evaluated. We could show that PD-1 expression on CD8 T cells was correlated with WHV viral loads during WHV infection. ETV treatment significantly decreased PD-1 expression on CD8 T cells in chronic carriers. In vivo blockade of PD-1/PD-L1 pathway on CD8 T cells, in combination with ETV treatment and DNA vaccination, potently enhanced the function of virus-specific T cells. Moreover, the combination therapy potently suppressed WHV replication, leading to sustained immunological control of viral infection, anti-WHs antibody development and complete viral clearance in some woodchucks. Our results provide a new approach to improve T cell function in chronic hepatitis B infection, which may be used to design new immunotherapeutic strategies in patients. Citation: Liu J, Zhang E, Ma Z, Wu W, Kosinska A, et al. (2014) Enhancing Virus-Specific Immunity In Vivo by Combining Therapeutic Vaccination and PD-L1 Blockade in Chronic Hepadnaviral Infection. PLoS Pathog 10(1): e1003856. doi:10.1371/journal.ppat.1003856 Editor: Charles M. Rice, The Rockefeller University, United States of America Received April 17, 2013; Accepted November 13, 2013; Published January 2, 2014 Copyright: 2014 Liu et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Funding: This work was supported by the Deutsche Forschungsgemeinschaft (TRR60 and GK 1045/2), National Major Science and Technology Project for Infectious Diseases of China (2008ZX10002-011, 2012ZX10004503), the National Natural Science Foundation of China (No. 30271170, 30571646, 81101248), and the International Science & Technology Cooperation Program of China (2011DFA31030). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. Competing Interests: The authors have declared that no competing interests exist. * E-mail: michael.roggendorf@uni-due.de" @default.
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• W2326827096 date "2013-04-01" @default.
• W2326827096 modified "2023-09-26" @default.
• W2326827096 title "389 ENHANCING VIRUS-SPECIFIC IMMUNITY IN VIVO BY COMBINING THERAPEUTIC VACCINATION AND PD1/PD-L1 BLOCKADE IN CHRONIC HEPADNAVIRAL INFECTION" @default.
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• W2326827096 doi "https://doi.org/10.1016/s0168-8278(13)60391-8" @default.
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