Volume 40, Issue 12 pp. 996-1004

Enhancement of cytotoxic T lymphocyte activity by dendritic cells loaded with Tat-protein transduction domain-fused hepatitis B virus core antigen

Xiaohua Chen

Xiaohua Chen

Department of Infectious Disease, Shanghai No. 6 People's Hospital, College of Medicine, Shanghai Jiaotong University, Shanghai 200233, China

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Yongsheng Yu

Yongsheng Yu

Department of Infectious Disease, Shanghai No. 6 People's Hospital, College of Medicine, Shanghai Jiaotong University, Shanghai 200233, China

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Qingchun Pan

Qingchun Pan

Department of Infectious Disease, Shanghai No. 6 People's Hospital, College of Medicine, Shanghai Jiaotong University, Shanghai 200233, China

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Zhenghao Tang

Zhenghao Tang

Department of Infectious Disease, Shanghai No. 6 People's Hospital, College of Medicine, Shanghai Jiaotong University, Shanghai 200233, China

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Jinchao Han

Jinchao Han

Department of Infectious Disease, Shanghai No. 6 People's Hospital, College of Medicine, Shanghai Jiaotong University, Shanghai 200233, China

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Guoqing Zang

Corresponding Author

Guoqing Zang

Department of Infectious Disease, Shanghai No. 6 People's Hospital, College of Medicine, Shanghai Jiaotong University, Shanghai 200233, China

*Corresponding author: Tel, 86-21-64369181-8673; Fax, 86-21-64369181; E-mail, [email protected]Search for more papers by this author
First published: 16 December 2008
Citations: 1

This work was supported by a grant from the National Natural Science Foundation of China (No. 30571669)

Abstract

The protein transduction domain (PTD) of human immunodeficiency virus-1-Tat protein has a unique potency to penetrate the cellular membranes. To synthesize the sequence of Tat-PTD47–57 and hepatitis B virus core antigen (HBcAg), we spliced thesesequences and linked a fusion gene into the pMAL-c2x vector. The fusion proteins were purified by affinity chromatography and pulsed with bone marrow-derived dendritic cells (DCs), and the transduction of recombinant protein was detected by immunofluorescence antibody assay. Results showed that recombinant PTD-HBcAg could penetrate into DC cytoplasm while recombinant HBcAg was detected on the surface of cells. The percentage of DC surface molecules, such as CD80, CD86 and major histocompatibility complex II, and production of cytokine (IL-12p70) induced by recombinant PTD-HBcAg were significantly higher than those induced by recombinant HBcAg or tumor necrosis factor-α. DCs treated with PTD-HBcAg induced T cells to differentiate into specific cytotoxic T lymphocytes (CTLs) and enhanced the CTL killing response. In conclusion, the expressed and purified PTD-HBcAg fusion protein could penetrate into cells through the plasma membrane, promote DC maturation, and enhance T cells response to generate HBcAg-specific CTLs efficiently.

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