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HCMV-induced signaling through gB-EGFR engagement is required for viral trafficking and nuclear translocation in primary human monocytes.
Proceedings of the National Academy of Sciences of the United States of America ( IF 11.1 ) Pub Date : 2020-08-11 , DOI: 10.1073/pnas.2003549117
Heather L Fulkerson 1, 2 , Liudmila S Chesnokova 1 , Jung Heon Kim 1, 3 , Jamil Mahmud 4 , Laura E Frazier 1 , Gary C Chan 4 , Andrew D Yurochko 2, 5, 6
Affiliation  

Previous analysis of postentry events revealed that human cytomegalovirus (HCMV) displays a unique, extended nuclear translocation pattern in monocytes. We determined that c-Src signaling through pentamer engagement of integrins is required upon HCMV entry to avoid sorting of the virus into late endosomes and subsequent degradation. To follow up on this previous study, we designed experiments to investigate how HCMV-induced signaling through the other major axis—the epidermal growth factor receptor (EGFR) kinase—regulates viral postentry events. Here we show that HCMV induces chronic and functional EGFR signaling that is distinct to the virus as compared to the natural EGFR ligand: EGF. This chronic EGFR kinase activity in infected monocytes is required for the proper subcellular localization of the viral particle during trafficking events, as well as for promoting translocation of viral DNA into the host nucleus. Our data indicate that HCMV glycoprotein B (gB) binds to EGFR at the monocyte surface, the virus and EGFR are internalized together, and gB remains bound to EGFR throughout viral postentry events until de-envelopment to promote the chronic EGFR kinase activity required for viral trafficking and nuclear translocation. These data highlight how initial EGFR signaling via viral binding is necessary for entry, but not sufficient to promote each viral trafficking event. HCMV appears to manipulate the EGFR kinase postentry, via gB–EGFR interaction, to be active at the critical points throughout the trafficking process that leads to nuclear translocation and productive infection of peripheral blood monocytes.



中文翻译:

通过gB-EGFR参与HCMV诱导的信号传导是人类原代单核细胞中病毒运输和核转运的必要条件。

进入事件后的先前分析表明,人类巨细胞病毒(HCMV)在单核细胞中显示出独特的扩展核易位模式。我们确定,HCMV进入后需要通过整合素的五聚体参与来进行c-Src信号传导,以避免将病毒分选为晚期内体和随后的降解。为了跟踪此先前的研究,我们设计了实验来研究HCMV诱导的通过另一主轴(表皮生长因子受体(EGFR)激酶)的信号传导如何调节病毒进入后事件。在这里,我们显示HCMV诱导了与天然EGFR配体EGF相比与病毒不同的慢性和功能性EGFR信号传导。在贩运事件期间,病毒颗粒的正确亚细胞定位需要感染单核细胞中的这种慢性EGFR激酶活性,以及促进病毒DNA转运到宿主核中。我们的数据表明,HCMV糖蛋白B(gB)在单核细胞表面与EGFR结合,病毒和EGFR被内在化,并且在整个病毒进入后事件中,gB仍然与EGFR结合,直到解除包膜以促进病毒所需的慢性EGFR激酶活性贩运和核易位。这些数据突显了通过病毒结合的初始EGFR信号传导对于进入是必需的,但不足以促进每次病毒运输事件。HCMV似乎通过gB-EGFR相互作用来操纵EGFR激酶的进入,在整个运输过程的关键点活跃,从而导致核易位和外周血单核细胞的生产性感染。我们的数据表明,HCMV糖蛋白B(gB)在单核细胞表面与EGFR结合,病毒和EGFR被内在化,并且在整个病毒进入后事件中,gB仍然与EGFR结合,直到解除包膜以促进病毒所需的慢性EGFR激酶活性贩运和核易位。这些数据突显了通过病毒结合的初始EGFR信号传导对于进入是必需的,但不足以促进每次病毒运输事件。HCMV似乎通过gB-EGFR相互作用来操纵EGFR激酶的进入,在整个运输过程的关键点活跃,从而导致核易位和外周血单核细胞的生产性感染。我们的数据表明,HCMV糖蛋白B(gB)在单核细胞表面与EGFR结合,病毒和EGFR被内在化,并且在整个病毒进入后事件中,gB仍然与EGFR结合,直到解除包膜以促进病毒所需的慢性EGFR激酶活性贩运和核易位。这些数据突显了通过病毒结合的初始EGFR信号传导对于进入是必需的,但不足以促进每次病毒运输事件。HCMV似乎通过gB-EGFR相互作用来操纵EGFR激酶的进入,在整个运输过程的关键点活跃,从而导致核易位和外周血单核细胞的生产性感染。在整个病毒进入后事件中,gB始终与EGFR结合,直到解除包封以促进病毒运输和核转运所需的慢性EGFR激酶活性为止。这些数据突显了通过病毒结合的初始EGFR信号传导对于进入是必需的,但不足以促进每个病毒运输事件。HCMV似乎通过gB-EGFR相互作用来操纵EGFR激酶的进入,在整个运输过程的关键点活跃,从而导致核易位和外周血单核细胞的生产性感染。在整个病毒进入后事件中,gB始终与EGFR结合,直到解除包封以促进病毒运输和核转运所需的慢性EGFR激酶活性为止。这些数据突显了通过病毒结合的初始EGFR信号传导对于进入是必需的,但不足以促进每次病毒运输事件。HCMV似乎通过gB-EGFR相互作用来操纵EGFR激酶的进入,从而在整个运输过程的关键点活跃,从而导致核易位和外周血单核细胞的生产性感染。但不足以促进每次病毒贩运活动。HCMV似乎通过gB-EGFR相互作用来操纵EGFR激酶的进入,从而在整个运输过程的关键点活跃,从而导致核易位和外周血单核细胞的生产性感染。但不足以促进每次病毒贩运活动。HCMV似乎通过gB-EGFR相互作用来操纵EGFR激酶的进入,在整个运输过程的关键点活跃,从而导致核易位和外周血单核细胞的生产性感染。

更新日期:2020-08-11
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