Institut Pasteur de Tunis, Laboratoire des Biomolécules, Venins et Applications Théranostiques, Tunis, Tunisia.
Université de Tunis El Manar, Tunis, Tunisia.
Drug Discov Ther. 2021 Jan 23;14(6):262-272. doi: 10.5582/ddt.2020.03106. Epub 2020 Dec 31.
The novel coronavirus, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) was identified in 2019 in Wuhan, China. Clinically, respiratory tract symptoms as well as other organs disorders are observed in patients positively diagnosed coronavirus disease 2019 (COVID-19). In addition, neurological symptoms, mainly anosmia, ageusia and headache were observed in many patients. Once in the central nervous system (CNS), the SARS-CoV-2 can reside either in a quiescent latent state, or eventually in actively state leading to severe acute encephalitis, characterized by neuroinflammation and prolonged neuroimmune activation. SRAS-CoV-2 requires angiotensin-converting enzyme 2 (ACE2) as a cell entry receptor. The expression of this receptor in endothelial cells of blood-brain barrier (BBB) shows that SRAS-CoV-2 may have higher neuroinvasive potential compared to known coronaviruses. This review summarizes available information regarding the impact of SRAS-CoV-2 in the brain and tended to identify its potential pathways of neuroinvasion. We offer also an understanding of the long-term impact of latently form of SARS-CoV-2 on the development of neurodegenerative disorders. As a conclusion, the persistent infection of SRAS-CoV-2 in the brain could be involved on human neurodegenerative diseases that evolve a gradual process, perhapes, over several decades.
新型冠状病毒,严重急性呼吸综合征冠状病毒 2(SARS-CoV-2)于 2019 年在中国武汉被鉴定出来。临床上,确诊为 2019 年冠状病毒病(COVID-19)的患者会出现呼吸道症状和其他器官功能障碍。此外,许多患者还出现了神经系统症状,主要是嗅觉丧失、味觉丧失和头痛。一旦进入中枢神经系统(CNS),SARS-CoV-2 可以处于静止潜伏状态,或者最终处于活跃状态,导致严重的急性脑炎,其特征是神经炎症和长期神经免疫激活。SARS-CoV-2 需要血管紧张素转换酶 2(ACE2)作为细胞进入受体。血脑屏障(BBB)内皮细胞中这种受体的表达表明,SARS-CoV-2 可能比已知的冠状病毒具有更高的神经侵袭潜力。这篇综述总结了关于 SARS-CoV-2 在大脑中的影响的现有信息,并试图确定其潜在的神经入侵途径。我们还了解了 SARS-CoV-2 潜伏形式对神经退行性疾病发展的长期影响。总之,SARS-CoV-2 在大脑中的持续感染可能与逐渐发展的人类神经退行性疾病有关,也许需要几十年的时间。
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