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石斑鱼c-Jun基因在虹彩病毒SGIV感染中的功分析
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摘要
c-jun蛋白在炎症反应和病毒感染中起了重要的作用。本研究通过RACE扩增得到石斑鱼c-Jun基因的cDNA全长。c-Jun基因在石斑鱼正常组织心脏、肾脏、头肾、脾脏、鳃、肠中表达相对较高,而在脑、皮肤、胃、肝、肌肉中相对较低。SGIV刺激细胞后,头肾组织中c-Jun基因表达量明显增加,推测c-Jun在SGIV感染中发挥了一定的作用。亚细胞定位结果表明,野生型Wt-c-Jun和显性负性突变体Dominant-negative(Dn-c-Jun)基因均主要分布于细胞核中,揭示该基因的磷酸化位点对于该基因亚细胞定位没有明显的影响。当在转染的细胞中感染SGIV后,大部分野生型Wt-c-Jun的绿色荧光从细胞核中转移到胞质中的病毒装配中心,这和我们以前报道的研究结果是一致的。而Dn-c-Jun的绿色荧光的定位没有发生明显的变化,仍然主要分布在细胞核,推测该基因的磷酸化位点对于该基因的功是必需的(图)。与空载体对照组相比,过表达Dn-c-Jun基因不仅明显延缓SGIV感染引起的细胞病理变化和降低病毒基因的转录,还抑制c-Jun和AP1基因的启动子活性,推测野生型的Ec-Jun基因磷酸化有利于SGIV的复制
In this study, the c-Jun gene(Ec-c-Jun) was cloned from orange-spotted grouper,Epinephelus coioides. Fluorescence microscopy observation revealed that Ec-c-Jun and DN-Ec-c-Jun were expressed predominantly in the nucleus in transfected cells. Interestingly, the green fluorescence of Ec-c-Jun was congregated and co-localized with virus assembly sites at the late stage of SGIV infection. However, in DN-Ec-c-Jun transfected cells, no virus assembly sites were observed, and the distribution of fluorescence remained unchanged. Moreover,overexpression of DN-Ec-c-Jun in vitro delayed the occurrence of CPE induced by SGIV infection and inhibited the virus gene transcription. In addition, ectopic expression of DN-Ec-c-Jun was able to inhibit SGIV induced c-Jun/AP1 promoter activity in GS cells. Thus, we proposed that c-Jun transcription factor was essential for SGIV replication in vitro. Our results will contribute to understanding the crucial roles of JNK signaling pathway in fish virus infection.
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