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核糖体蛋白L12(RPL12)在猪繁殖与呼吸综合征病毒复制中的作用

2021-07-23殷杰赵永祥薛江东刘锴李彬马德慧

江苏农业学报 2021年3期

殷杰 赵永祥 薛江东 刘锴 李彬 马德慧

摘要: 为研究宿主细胞核糖体蛋白L12(RPL12)在猪繁殖与呼吸综合征病毒(Porcine reproductive and respiratory syndrome virus, PRRSV)复制中的作用,本研究通过荧光定量PCR和Western-blotting等方法,检测了PRRSV感染对Marc-145细胞中RPL12表达的影响,以及过表达或敲减RPL12对PRRSV复制的影响。结果显示,PRRSV感染可上调Marc-145细胞中RPL12基因的表达。过表达RPL12可促进PRRSV的复制,而敲减RPL12可抑制PRRSV的复制。通过免疫共沉淀和共聚焦显微镜检测,进一步研究发现RPL12蛋白与PRRSV GP2b蛋白存在相互作用,并共定位于细胞质中。本研究首次发现了宿主蛋白RPL12能够促进PRRSV复制,并与PRRSV GP2b蛋白存在相互作用,为进一步研究PRRSV的感染与复制机制以及与宿主的相互作用提供了新的切入点,为抗病毒药物的研发提供了有益的探索。

关键词: 猪繁殖与呼吸综合征病毒(PRRSV);核糖体蛋白L12(RPL12);PRRSV GP2b蛋白

中图分类号: S852.65 文献标识码: A 文章编号: 1000-4440(2021)03-0686-08

Role of ribosomal protein L12(RPL12) in porcine reproductive and respiratory syndrome virus replication

YIN Jie1,2, ZHAO Yong-xiang2, XUE Jiang-dong1, LIU Kai1, LI Bin2, MA De-hui1

(1.College of Animal Science and Technology, Inner Mongolia University for Nationalities, Tongliao 028000, China;2.Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China)

Abstract: To study the role of host cell ribosomal protein L12 (RPL12) in the replication of porcine reproductive and respiratory syndrome virus (PRRSV), real-time quantitative PCR and Western-blotting were performed to detect the effect of PRRSV infection on the expression of RPL12 in Marc-145 cells and the effect of over-expression and knockdown of RPL12 on the replication of PRRSV. The results showed that PRRSV infection could up-regulate the expression of RPL12 in Marc-145 cells. Over-expression of RPL12 promoted the replication of PRRSV, while knockdown of the RPL12 inhibited the replication of PRRSV. Through co-immunoprecipitation and confocal microscopy analysis, further study found that RPL12 protein interacted with PRRSV GP2b protein and co-localized in the cytoplasm. This study reported for the first time that the host protein RPL12 could promote PRRSV replication and interact with PRRSV GP2b protein, which provides a new cut-in point for further research on the mechanism of PRRSV infection and replication, and also provides a beneficial exploration for the development of antiviral drugs.

Key words: porcine reproductive and respiratory syndrome virus(PRRSV);ribosomal protein L12 (RPL12);PRRSV GP2b protein

猪繁殖与呼吸综合征病毒(PRRSV)是猪繁殖与呼吸综合征(PRRS)的病原体[1],是一种有囊膜的单股正链RNA病毒,是冠状病毒科成员[2],在分类上属于动脉病毒属[3]。该病毒主要引起怀孕母猪早产、流产以及木乃伊胎等繁殖障碍,也会引起公猪精液质量下降,仔猪和育肥猪呼吸困难等症状[4]。病毒在扁桃体、肺和淋巴器官中持续复制,可抑制宿主先天免疫[5-8]。另外,PRRSV经常与猪圆环二型(PCV2)猪瘟等病毒和副猪嗜血杆菌等细菌存在混合感染[9-11],而且PRRSV存在毒力返强、变异以及与临床毒株发生重组的风险,防控难度大,给中国养猪业造成了巨大损失。目前,PRRSV感染与复制机制还未完全闡明,特别是宿主蛋白质在病毒复制中的作用的研究尚不深入,解析这些问题有助于理解PRRSV的致病与免疫机制,有助于制定PRRSV防控措施。……

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