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B7-DC-silenced dendritic cells induce stronger anti-HBV immunity in transgenic mice

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Abstract

Hepatitis B virus (HBV) is a noncytopathic DNA virus and is the pathogen of acute and chronic hepatitis. Interferon and nucleotide analogues such as lamivudine and adefovir are the current treatment strategies of HBV infection; however, it is still a serious disease. Therefore, the development of new therapeutic options against HBV is needed. In the present study, we have investigated whether the vectors carrying short hairpin RNA (shRNA) targeting the murine B7-DC gene could silence the expression of B7-DC and analyzed the function of gene-modified dendritic cells (DCs) by mixed lymphocyte reaction. The results demonstrated that two shRNA vectors efficiently suppressed the expression of B7-DC. The MLR assay showed that shRNA-B7-DC-transfected DCs induced markedly higher allogeneic lymphocyte proliferation than transfected DCs with the vector plasmid pAS and untreated DCs at all dilutions. The most efficient shRNA plasmid vector against B7-DC was then used to silence the expression of B7-DC on DCs, the gene-modified DCs were pulsed with HBV-specific peptides, and HBV transgenic mice were immunized. After three rounds of immunization, the splenocytes were stimulated in vitro and tested for cytotoxicitic T lymphocyte activity, while the sera were used to detect the level of HBsAg and HBV DNA. The data demonstrated that blockade of B7-DC on DCs augmented the cytolytic activity induced by immunization with peptide-pulsed DCs and significantly reduced the concentration of serum HBsAg and HBV DNA, suggesting that silencing of B7-DC is of potential value in DC-based therapy of HBV infection.

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Acknowledgements

This work was supported by grants from National Natural Science Fund of China (30400070) and Shanghai Rising-Star Program (06QA14017).

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Authors and Affiliations

  1. School of Life Science, East China Normal University, 3663 Zhongshan Road, 200062, Shanghai, People’s Republic of China

    Yan Fan, Wen-Zheng Jiang, Jie-Jun Wen, Wen-Li Hao, Jia-Ni Du & Min Qian

  2. College of Pharmacy, Second Military Medical University, 200433, Shanghai, People’s Republic of China

    Xia Liu

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  1. Yan Fan
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  2. Wen-Zheng Jiang
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Correspondence to Wen-Zheng Jiang.

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Fan, Y., Jiang, WZ., Wen, JJ. et al. B7-DC-silenced dendritic cells induce stronger anti-HBV immunity in transgenic mice. Arch Virol 154, 1813–1821 (2009). https://doi.org/10.1007/s00705-009-0521-7

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  • DOI: https://doi.org/10.1007/s00705-009-0521-7

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