Construction and characterization of a recombinant pseudorabies virus expressing porcine reproductive and respiratory syndrome virus GP5.

Zhi-Jun Tian, Hua-Ji Qiu, Jian-Qiang Ni, Yan-Jun Zhou, Xue-Hui Cai, Guo-Hui Zhou, Yun-Feng Wang, Guang-Zhi Tong
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Abstract

The GP5 gene of porcine reproductive and respiratory syndrome virus (PRRSV) was integrated into the TK gene locus of pseudorabies virus (PRV) vaccine strain Bartha-K61, resulting in a TK- and gE- negative recombinant PRV harboring GP5 gene, designated as rPRV-GP5. The in vitro expression of the GP5 by rPRV-GP5-infected cells was analyzed by single-step growth analysis,Western blot,and indirect immunofluorescence test. It was shown that GP5 gene can be expressed authentically in the cytoplasm of rPRV-GP5-infected cells. Compared to its parental virus, rPRV-GP5 showed no obvious difference regarding viral replication and cytopathogenic effects in several cell cultures. Four PRV-negative sheep immunized intramuscularly with 10(6.0) PFU of rPRV-GP5 were fully protected from challenge with 10(3) LD50 of highly virulent PRV S strain of porcine origin. Ten PRV- and PRRSV-negative piglets given intranasally with 10(7.0) PFU of rPRV-GP5 and challenged intranasally with 10(5.0) TCID50 of virulent PRRSV CH-1a strain at day 63 post-inoculation developed antibodies against PRRSV 3, 5, 14 days post-challenge, as revealed by indirect immunofluorescence test, enzyme-linked immunosorbent assay and virus neutralization test. The results suggest that rPRV-GP5 is capable of inducing anamnestic immune response to PRRS in inoculated animals.

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表达猪繁殖与呼吸综合征病毒GP5的重组伪狂犬病毒的构建与鉴定
短句来源将猪繁殖与呼吸综合征病毒(PRRSV)的GP5基因整合到伪狂犬病毒(PRV)疫苗株Bartha-K61的TK基因位点上,得到了一株含有GP5基因的TK和gE阴性重组PRV,命名为rPRV-GP5。采用单步生长法、Western blot法和间接免疫荧光法检测rprv -GP5感染细胞对GP5的体外表达。结果表明,GP5基因可以在rprv -GP5感染细胞的细胞质中真实表达。与亲本病毒相比,在几种细胞培养中,rPRV-GP5在病毒复制和细胞致病作用方面没有明显差异。用10(6.0)PFU rPRV-GP5肌内免疫的4只PRV阴性羊完全免受高毒性猪源PRV S株10(3)LD50的攻击。间接免疫荧光试验、酶联免疫吸附试验和病毒中和试验显示,接种后第63天,10头PRV和PRRSV阴性仔猪经鼻灌胃10(7.0)PFU的rPRV-GP5,并经鼻灌胃10(5.0)TCID50的强毒PRRSV CH-1a株,在灌胃后第3、5、14天产生了抗PRRSV抗体。结果提示,rPRV-GP5能够诱导接种动物对PRRS产生遗忘性免疫反应。
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