Interferons and viruses induce a novel truncated ACE2 isoform and not the full-length SARS-CoV-2 receptor.

Interferons and viruses induce a novel truncated ACE2 isoform and not the full-length SARS-CoV-2 receptor.
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干扰素和病毒诱导了新型的截断ACE2同工型,而不是全长SARS-COV-2受体。

DOI:
10.1038/s41588-020-00731-9
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发表时间:
2020-12
期刊:
影响因子:
30.8
通讯作者:
Prokunina-Olsson, Ludmila
Prokunina-Olsson, Ludmila
中科院分区:
生物学1区
文献类型:
--
作者:
Onabajo, Olusegun O.;Banday, A. Rouf;Stanifer, Megan L.;Yan, Wusheng;Obajemu, Adeola;Santer, Deanna M.;Florez-Vargas, Oscar;Piontkivska, Helen;Vargas, Joselin M.;Ring, Timothy J.;Kee, Carmon;Doldan, Patricio;Tyrrell, D. Lorne;Mendoza, Juan L.;Boulant, Steeve;Prokunina-Olsson, Ludmila

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引起COVID-19的严重急性呼吸综合征冠状病毒2(SARS-CoV-2)利用血管紧张素转换酶2(ACE 2)进入靶细胞。ACE 2被认为是一种干扰素刺激基因(interferon-stimulated gene,ISG)。因此,干扰素诱导的ACE 2表达水平的变化可能对COVID-19的易感性或其结果很重要。在这里,我们报告发现了一种新的,转录独立的截断亚型的ACE 2,我们指定为deltaACE 2(dACE 2)。我们证明,dACE 2,而不是ACE 2,是一个ISG。在癌症基因组图谱(TCGA)中,dACE 2的表达在呼吸道、胃肠道和泌尿生殖道的鳞状肿瘤中富集。在体外,dACE 2,它缺乏356个N-末端氨基酸,在结合SARS-CoV-2刺突蛋白和作为羧肽酶是无功能的。我们的研究结果表明,在治疗、炎症性肿瘤微环境或病毒合并感染产生的高IFN条件下,ISG型dACE 2诱导不太可能增加SARS-CoV-2的细胞进入并促进感染。
Severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2), which causes COVID-19, utilizes angiotensin-converting enzyme 2 (ACE2) for entry into target cells. ACE2 has been proposed as an interferon-stimulated gene (ISG). Thus, interferon-induced variability in ACE2 expression levels could be important for susceptibility to COVID-19 or its outcomes. Here, we report the discovery of a novel, transcriptionally-independent truncated isoform of ACE2, which we designate as deltaACE2 (dACE2). We demonstrate that dACE2, but not ACE2, is an ISG. In The Cancer Genome Atlas (TCGA), the expression of dACE2 was enriched in squamous tumors of the respiratory, gastrointestinal, and urogenital tracts. In vitro, dACE2, which lacks 356 N-terminal amino acids, was non-functional in binding the SARS-CoV-2 spike protein and as a carboxypeptidase. Our results suggest that the ISG-type induction of dACE2 in IFN-high conditions created by treatments, inflammatory tumor microenvironment, or viral co-infections is unlikely to increase the cellular entry of SARS-CoV-2 and promote infection.
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