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首页> 外文期刊>Microbes and infection >Immediate-early antigen expression and modulation of apoptosis after in vitro infection of polymorphonuclear leukocytes by human cytomegalovirus.
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Immediate-early antigen expression and modulation of apoptosis after in vitro infection of polymorphonuclear leukocytes by human cytomegalovirus.

机译:人巨细胞病毒体外感染多形核白细胞后,立即早期抗原表达和细胞凋亡的调控。

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摘要

Polymorphonuclear leukocytes (PMNL) are a major carrier of human cytomegalovirus (CMV) in viremic immunodepressed patients. We transmitted infectious virions and viral components to PMNL by coculturing these cells with infected human embryonic lung fibroblasts (HELF) or human umbilical vein endothelial cells (HUVEC). Quantitative time-course analysis of viral DNA and protein expression in PMNL, after functional separation from infected donor cells, indicated the initiation of viral cycling, with immediate-early protein expression. No viral replication or early or late gene expression was observed, but infected PMNL were able to infect naive fibroblasts more than 48 h after the end of co-culture. PMNL apoptosis was significantly delayed during co-culture with infected or uninfected HUVEC, and this phenomenon did not require contact between the two cell populations. The increased production of IL-8 in the same culture conditions that protect PMNL from apoptosis, associated with the reversion of this protection by inhibiting or depleting this factor in the culture media, targets this cytokine as a likely candidate for this protective effect. These data suggest that PMNL play a key role in virus dissemination in vivo, through their interactions with infected endothelial cells.
机译:多形核白细胞(PMNL)是病毒血症免疫抑制患者中人巨细胞病毒(CMV)的主要载体。通过将这些细胞与感染的人类胚胎肺成纤维细胞(HELF)或人类脐静脉内皮细胞(HUVEC)共培养,我们将传染性病毒粒子和病毒成分传递给PMNL。从感染的供体细胞中功能分离后,PMNL中病毒DNA和蛋白质表达的定量时程分析表明病毒循环开始,且蛋白质表达较早。未观察到病毒复制或早期或晚期基因表达,但在共培养结束后超过48小时,感染的PMNL能够感染幼稚成纤维细胞。与感染或未感染的HUVEC共培养期间,PMNL细胞凋亡显着延迟,这种现象不需要两个细胞群之间的接触。通过在培养基中抑制或消耗该因子,在保护PMNL免受凋亡的相同培养条件下,IL-8产量的增加与该保护作用的逆转相关,将这种细胞因子作为该保护作用的可能候选者。这些数据表明,PMNL通过与感染的内皮细胞相互作用,在体内病毒传播中起关键作用。

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