Crimean-Congo hemorrhagic fever virus (CCHFV) causes a lethal tick-borne zoonotic disease with severe clinical manifestation in humans but does not produce symptomatic disease in wild or domestic animals. The factors contributing to differential outcomes of infection between species are not yet understood. Since CCHFV is known to have tropism to kidney tissue and cattle play an important role as an amplifying host for CCHFV, in this study, we assessed in vitro cell susceptibility to CCHFV infection in immortalized and primary kidney and adrenal gland cell lines of human and bovine origin. Based on our indirect fluorescent focus assay (IFFA), we suggest a cell-to-cell CCHF viral spread process in bovine kidney cells but not in human cells. Over the course of seven days post-infection (dpi), infected bovine kidney cells are found in restricted islet-like areas. In contrast, three dpi infected human kidney or adrenal cells were noted in areas distant from one another yet progressed to up to 100% infection of the monolayer. Pronounced CCHFV replication, measured by quantitative real-time RT-PCR (qRT-PCR) of both intra- and extracellular viral RNA, was documented only in human kidney cells, supporting restrictive infection in cells of bovine origin. To further investigate the differences, lactate dehydrogenase activity and cytopathic effects were measured at different time points in all mentioned cells. In vitro assays indicated that CCHFV infection affects human and bovine kidney cells differently, where human cell lines seem to be markedly permissive. This is the initial reporting of CCHFV susceptibility and replication patterns in bovine cells and the first report to compare human and animal cell permissiveness in vitro. Further investigations will help to understand the impact of different cell types of various origins on the virus-host interaction.

译文

克里米亚-刚果出血发热病毒 (CCHFV) 引起致命的tick传播的人畜共患病,在人类中具有严重的临床表现,但在野生或家畜中不会产生症状性疾病。尚未了解导致物种之间感染结果差异的因素。由于已知CCHFV对肾脏组织具有嗜性,并且牛作为CCHFV的扩增宿主起着重要作用,因此在这项研究中,我们评估了人类和牛起源的永生化和原发性肾脏和肾上腺细胞系对CCHFV感染的体外细胞敏感性。基于我们的间接荧光聚焦测定 (IFFA),我们建议在牛肾细胞中而不是在人细胞中进行细胞间CCHF病毒传播过程。在感染后 (dpi) 的七天内,在胰岛样区域发现了受感染的牛肾细胞。相反,在彼此远离的区域中观察到三个dpi感染的人肾脏或肾上腺细胞,但进展到单层的100% 感染。通过定量实时rt-pcr (qRT-PCR) 对细胞内和细胞外病毒RNA进行测量,仅在人肾细胞中记录了明显的CCHFV复制,支持牛来源细胞中的限制性感染。为了进一步研究差异,在所有提到的细胞的不同时间点测量了乳酸脱氢酶活性和细胞病变作用。体外测定表明,CCHFV感染对人和牛肾细胞的影响不同,而人细胞系似乎明显允许。这是牛细胞中CCHFV敏感性和复制模式的初步报道,也是首次比较体外人类和动物细胞许可性的报道。进一步的研究将有助于了解不同来源的不同细胞类型对病毒-宿主相互作用的影响。

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