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Open Access Research

Design and evaluation of a multi-epitope assembly Peptide (MEAP) against herpes simplex virus type 2 infection in BALB/c mice

Xingsheng Wang1, Guangyan Xie3, Jianming Liao2, Dengke Yin3, Wenyan Guan1, Mingjie Pan1, Jingnian Li4 and Yuexi Li1*

Author Affiliations

1 Huadong Research Institute for Medicine and Biotechniques, Nanjing, 210002, China

2 School of Life Science and Technology, China Pharmaceutical University, Nanjing, China, 210009

3 Department of Pharmacy, Anhui University of Traditional Chinese Medicine, Hefei, China, 230038

4 Department of Immunology and Microbiology, Anhui Agriculture University, Hefei, China, 230038

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Virology Journal 2011, 8:232  doi:10.1186/1743-422X-8-232

Published: 16 May 2011

Abstract

Background

Human herpes simplex virus (HSV) 1 and 2 causes oral, ocular, or genital infections, which remains a significant health problem worldwide. HSV-1 and -2 infections in humans range from localized skin infections of the oral, ocular, and genital regions to severe and often disseminated infections in immunocompromised hosts. Epitope based vaccination is a promising mean to achieve protective immunity and to avoid infections with Human herpes simplex virus type 2 (HSV-2).

Methods

The twelve selected epitopes, six B cell epitopes from different glycoprotein of HSV-2 (amino acid residues 466-473 (EQDRKPRN) from envelope glycoprotein B, 216-223 (GRTDRPSA) from C, 6-18 (DPSLKMADPNRFR) from D, 483-491 (DPPERPDSP) from E, 572-579 (EPPDDDDS) from G and 286-295 (CRRRYRRPRG) from I glycoprotein of HSV-2), four CD4+ T cell epitopes (amino acid residues 21-28 (NLPVLDQL) from D, 162-177 (KDVTVSQVWFGHRYSQ) from B, 205-224 (KAYQQGVTVDSIGMLPRFIP) from D and 245-259 (KPPYTSTLLPPELSD) from D) and two CD8+ T cell epitopes (amino acid residues 10-20 (KMADPNRFRGK) from D and 268-276 (ALLEDPAGT) from D), are responsible for the elicitation of the neutralizing antibodies and cytotoxic T lymphocytes (CTLs) that impart protective immunity to the host. In this study, all above epitopes were inserted into the extracellular fragment (amino acid residues 1-290) of HSV-2 glycoprotein D to construct multi-epitope assembly peptides (MEAPs) by replacing some non-epitope amino acid sequences. The epitope independency of the MEAPs was predicted by three-dimensional software algorithms. The gene of the selected MEAP was expressed in E.coli BL21(DE3), and its protective efficacy against HSV-2 infection was assessed in BALB/c mice.

Results

The MEAP, with each inserted epitopes independently displayed on the molecule surface, was selected as candidate proteins. The results showed that the MEAP was highly immunogenic and could elicit high titer neutralizing antibodies and cell-mediated immune responses.

Conclusions

The MEAP provided complete protection against infection with HSV-2 in mice, which indicates that it might be a potential candidate vaccine against HSV-2.