Department of Genetics and Genomics, College of Medicine and Health Sciences, United Arab Emirates University, Al-Ain, United Arab Emirates.
Zayed Centre for Health sciences, United Arab Emirates University, Al-Ain, United Arab Emirates.
Hum Genomics. 2021 Jan 29;15(1):8. doi: 10.1186/s40246-021-00304-9.
With the emergence of the novel coronavirus SARS-CoV-2 since December 2019, more than 65 million cases have been reported worldwide. This virus has shown high infectivity and severe symptoms in some cases, leading to over 1.5 million deaths globally. Despite the collaborative and concerted research efforts that have been made, no effective medication for COVID-19 (coronavirus disease-2019) is currently available. SARS-CoV-2 uses the angiotensin-converting enzyme 2 (ACE2) as an initial mediator for viral attachment and host cell invasion. ACE2 is widely distributed in the human tissues including the cell surface of lung cells which represent the primary site of the infection. Inhibiting or reducing cell surface availability of ACE2 represents a promising therapy for tackling COVID-19. In this context, most ACE2-based therapeutic strategies have aimed to tackle the virus through the use of angiotensin-converting enzyme (ACE) inhibitors or neutralizing the virus by exogenous administration of ACE2, which does not directly aim to reduce its membrane availability. However, through this review, we present a different perspective focusing on the subcellular localization and trafficking of ACE2. Membrane targeting of ACE2, and shedding and cellular trafficking pathways including the internalization are not well elucidated in literature. Therefore, we hereby present an overview of the fate of newly synthesized ACE2, its post translational modifications, and what is known of its trafficking pathways. In addition, we highlight the possibility that some of the identified ACE2 missense variants might affect its trafficking efficiency and localization and hence may explain some of the observed variable severity of SARS-CoV-2 infections. Moreover, an extensive understanding of these processes is necessarily required to evaluate the potential use of ACE2 as a credible therapeutic target.
自 2019 年 12 月以来,新型冠状病毒 SARS-CoV-2 的出现,导致全球报告的病例已超过 6500 万例。该病毒在某些情况下具有高度传染性和严重症状,导致全球超过 150 万人死亡。尽管已经进行了协作和协调一致的研究,但目前尚无针对 COVID-19(2019 年冠状病毒病)的有效药物。SARS-CoV-2 使用血管紧张素转换酶 2(ACE2)作为病毒附着和宿主细胞入侵的初始介质。ACE2 在人体组织中广泛分布,包括肺细胞的细胞表面,肺细胞是感染的主要部位。抑制或减少 ACE2 的细胞表面可用性代表了治疗 COVID-19 的一种有前途的疗法。在这种情况下,大多数基于 ACE2 的治疗策略旨在通过使用血管紧张素转换酶(ACE)抑制剂或通过外源性给予 ACE2 来中和病毒,这并不能直接旨在减少其膜可用性。然而,通过本次综述,我们提出了一个不同的观点,重点关注 ACE2 的亚细胞定位和运输。ACE2 的膜靶向、脱落和细胞运输途径,包括内吞作用,在文献中尚未得到很好的阐明。因此,我们在此概述了新合成的 ACE2 的命运、其翻译后修饰以及已知的运输途径。此外,我们强调了一些已识别的 ACE2 错义变体可能影响其运输效率和定位的可能性,因此可能解释了观察到的 SARS-CoV-2 感染严重程度的一些差异。此外,为了评估 ACE2 作为可信治疗靶点的潜在用途,有必要广泛了解这些过程。
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