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Frontiers of Agricultural Science and Engineering

ISSN 2095-7505

ISSN 2095-977X(Online)

CN 10-1204/S

Postal Subscription Code 80-906

Front. Agr. Sci. Eng.    2015, Vol. 2 Issue (3) : 216-222    https://doi.org/10.15302/J-FASE-2015072
RESEARCH ARTICLE
Research and development of a novel subunit vaccine for the currently circulating pseudorabies virus variant in China
Yuzhou WANG1,Tongyan WANG1,He YAN1,Fanli YANG1,Linghua GUO1,Qingyuan YANG1,Xule HU1,Feifei TAN1,Yan XIAO1,Xiangdong LI1,*(),Kegong TIAN1,2,*()
1. National Research Center for Veterinary Medicine, Luoyang 471003, China
2. College of Animal Science and Veterinary Medicine, Henan Agricultural University, Zhengzhou 450002, China
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Abstract

Pseudorabies (PR) is a devastating viral disease which leads to fatal encephalitis and respiratory disorders in pigs. Commercial gE-deleted live pseudorabies virus (PRV) vaccine has been widely used to control this disease in China. However, the new-emerging variants of PRV compromises the protection provided by current vaccines and lead to the outbreak of PR in vaccinated pig herds. Several killed and live vaccine candidates based on current PRV variants have been reported to be effective to control the disease. A subunit vaccine based on gB protein, one major PRV glycoprotein which elicits strong humoral and cellular immune responses, however, was never evaluated for protection against the current circulating PRV variants. In this study, full-length PRV gB protein was successfully expressed in baculovirus/insect cells in the soluble format and was tested on 3-week-old piglets as a subunit vaccine. Compared with unvaccinated pigs, the gB-vaccinated pigs developed specific antibody-mediated responses and were protected from the virulent PRV HN1201 challenge. All vaccinated pigs survived without showing any PRV-specific respiratory and neurological signs, but all unvaccinated pigs died within 7 days after HN1201 challenge. Hence, this novel gB-based vaccine could be applied as an effective subunit vaccine to control PRV variant in China.

Keywords pseudorabies virus      glycoprotein B protein      subunit vaccine     
Corresponding Author(s): Xiangdong LI,Kegong TIAN   
Just Accepted Date: 22 October 2015   Online First Date: 03 November 2015    Issue Date: 10 November 2015
 Cite this article:   
Yuzhou WANG,Tongyan WANG,He YAN, et al. Research and development of a novel subunit vaccine for the currently circulating pseudorabies virus variant in China[J]. Front. Agr. Sci. Eng. , 2015, 2(3): 216-222.
 URL:  
https://academic.hep.com.cn/fase/EN/10.15302/J-FASE-2015072
https://academic.hep.com.cn/fase/EN/Y2015/V2/I3/216
Fig.1  Expression and purification of gB protein analysis by SDS-PAGE (a) and western blot (b). (a) Lane 1, the supernatant of sf9 insect cell culture; lane 2, purified S1 protein using immunoaffinity chromatography; lane 3, protein marker; (b) lane 1, protein marker; lane 2, the recombinant protein was recognized by HIS-tag monoclonal antibody; lane 3, the recombinant protein was recognized by PRV-gB specific monoclonal antibody.
Fig.2  Body temperature (a) and clinical symptom score (b) of pigs within first 7 days after PRV HN1201 challenge. *P<0.05.
Fig.3  Body weight gain (a) and survival rate of pigs (b) after PRV HN1201 challenge. *P<0.05.
Fig.4  Profile of PRV gB-specific (a) and gE-specific (b) antibody responses after vaccination and challenge.
Fig.5  Histopathological results of vaccinated (a−e) and unvaccinated pigs (f−j). (a−e) Tonsil, lung, brain, cerebellum and trigeminal ganglia samples from vaccinated pigs, respectively. No obvious histopathological changes were observed; (f) tonsil. Tonsillar lymphoid tissue necrosis and formation of large necrotic foci; (g) lung. Massive vascular congestion and hemorrhage; (h) brain. Nonsuppurative meningoencephalitis; (i) cerebellum. Purkinje cell degeneration and necrosis; (j) trigeminal ganglia. Infiltration of lymphocytes around the neuron of trigeminal ganglia. Original magnification 400×.
Fig.6  Immunochemistry staining of tonsil (a, f), lung (b, g), brain (c, h), cerebellum (d, i), and trigeminal ganglia (e, j) samples of vaccinated (a−e) and unvaccinated pigs (f−j). Original magnification 400×.
GroupsTonsilLungBrainCerebellumTrigeminal ganglia
DMEM++++-+
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++++++++++
+ +++
++++++
Vaccine
+
+
+
Tab.1  Virus antigen distribution and intensity in different organs detected by immunohistochemistry staining
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