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Evidence of the COVID-19 Virus Targeting the CNS: Tissue Distribution, Host–Virus Interaction, and Proposed Neurotropic Mechanisms

  • Abdul Mannan Baig*
    Abdul Mannan Baig
    Department of Biological and Biomedical Sciences, Aga Khan University, Karachi 74800, Pakistan
    *Tel: +92-(0)333-2644-246. E-mail: [email protected]
    More by Abdul Mannan Baig
    Orcidhttp://orcid.org/0000-0003-0626-216X
  • , 
  • Areeba Khaleeq
    Areeba Khaleeq
    Department of Biological and Biomedical Sciences, Aga Khan University, Karachi 74800, Pakistan
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  • , 
  • Usman Ali
    Usman Ali
    Medical College, Aga Khan University, Karachi 74800, Pakistan
    More by Usman Ali
  • , and 
  • Hira Syeda
    Hira Syeda
    Department of Biosciences, Mohammad Ali Jinnah University, Karachi 75400, Pakistan
    More by Hira Syeda
Cite this: ACS Chem. Neurosci. 2020, 11, 7, 995–998
Publication Date (Web):March 13, 2020
https://doi.org/10.1021/acschemneuro.0c00122
Copyright © 2020 American Chemical Society
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Abstract

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The recent outbreak of coronavirus infectious disease 2019 (COVID-19) has gripped the world with apprehension and has evoked a scare of epic proportion regarding its potential to spread and infect humans worldwide. As we are in the midst of an ongoing pandemic of COVID-19, scientists are struggling to understand how it resembles and differs from the severe acute respiratory syndrome coronavirus (SARS-CoV) at the genomic and transcriptomic level. In a short time following the outbreak, it has been shown that, similar to SARS-CoV, COVID-19 virus exploits the angiotensin-converting enzyme 2 (ACE2) receptor to gain entry inside the cells. This finding raises the curiosity of investigating the expression of ACE2 in neurological tissue and determining the possible contribution of neurological tissue damage to the morbidity and mortality caused by COIVD-19. Here, we investigate the density of the expression levels of ACE2 in the CNS, the host–virus interaction and relate it to the pathogenesis and complications seen in the recent cases resulting from the COVID-19 outbreak. Also, we debate the need for a model for staging COVID-19 based on neurological tissue involvement.

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  Note

This article is made available via the ACS COVID-19 subset for unrestricted RESEARCH re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the World Health Organization (WHO) declaration of COVID-19 as a global pandemic.

1. The Novel COVID-19 Virus

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The first reports of the viral infection attracted attention in late December 2019 in Wuhan, the capital of Hubei, China. Later, it was revealed that the virus responsible for causing the infections was contagious between humans. By early January, terms like “the new coronavirus” and “Wuhan coronavirus” were in common use. On February 11, 2020, a taxonomic designation “severe acute respiratory syndrome coronavirus 2” (SARS-CoV-2) became the official means to refer to the virus strain, that was previously termed as 2019-nCoV and Wuhan coronavirus. Within a few hours on the same day, the WHO officially renamed the disease as COVID-19.

2. The Genome of the COVID-19 Virus

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The complete genome of SARS-CoV-2 from Wuhan, China was submitted on January 17, 2020 in the National Center for Biotechnology (1) (NCBI) database, with ID NC_045512. The genome of SARS-CoV-2 is a 29,903 bp single-stranded RNA (ss-RNA) coronavirus. It has now been shown that the virus causing COVID-19 is a SARS-like coronavirus that had previously been reported in bats in China.

3. Tissue Distribution of ACE2 in Human Organs and Tissues

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In order to discover the neurovirulence of SARS-CoV-2 and relate it to neurological tissue expression of ACE2, data retrieval was done from human protein databases. Most of the evidence of ACE2 expression in the brain (Figure 1) comes from literature and mammalian tissue expression databases, (2) which prompted us to investigate neurotropic effects of SARS-CoV-2 and its contribution toward the morbidity and mortality of patients with COVID-19.

Figure 1

Figure 1. Tissue distribution of ACE2 receptors in humans. Viremia (A) disseminates the COVID-19 virus throughout the body via the bloodstream (B). Neurotropism may occur via circulation and/or an upper nasal trancribrial route that enables the COVID-19 to reach the brain (C) and bind and engage with the ACE2 receptors (D, blue). COVID-19 docks on the ACE2 via spike protein (D, golden spikes). Shown are lungs, heart, kidneys, intestines, brain, and testicles that are well-known to express ACE2 receptors and are possible targets of COVID-19.

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3.1. Evidence of the Distribution of ACE2 in the Human Brain

The brain has been reported to express ACE2 receptors (Figure 1A, C) that have been detected over glial cells and neurons, which makes them a potential target of COVID-19. Previous studies have shown the ability of SARS-CoV to cause neuronal death in mice by invading the brain via the nose close to the olfactory epithelium. (3) The contribution of the neurotropic potential of SARS-CoV-2 in patients reported in the recent outbreak of COVID-19 remains to be established. In the SARS-CoV infections that were reported in the past, autopsy findings of the patients have shown strong evidence of the presence of SARS-CoV by electron microscopy, immunohistochemistry, and real-time reverse transcription-PCR (3). Patients with acute SARS-CoV illness have also demonstrated the presence of the virus in cerebrospinal fluid. The role of the blood-brain barrier in containing the virus and preventing it from gaining access to the neural tissues needs to be further explored in patients diagnosed with COVID-19. Recently, a study posted in medRxiv (4) has reported neurological manifestations in COVID-19 in the current outbreak that involved 214 patients, of which 78 (36.4%) patients had neurologic manifestations, which affirms our rationale of the neurotropic potential in the COVID-19 virus. Also, a finding published on a patient who had loss of involuntary control over breathing (5) during the recent outbreak with several other patients suffering acute respiratory failure implores healthcare professionals and clinicians to segregate COVID-19 patients into neurologically affected cases and those who are devoid of neurological deficits.

4. Host–Virus Interaction: How the ACE2 Receptor Is Exploited by the COVID-19 Virus to Gain Entry Inside the Host Cells

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With the mRNA encoding several other proteins, (1) the COVID-19 virus, like SARS-CoV, uses a spike protein S1 that enables the attachment of the virion to the cell membrane by interacting with host ACE2 receptor (3,6) (Figure 1C, D). In the later study, (6) it was shown that the ACE2 binding affinity of the 2019-nCoV spike protein ectodomain was 10–20-fold higher than that of the SARS-CoV spike protein. A BLASTp search of the COVID-19 virus (SARS-CoV-2) receptor binding domain (RBD) subdomain-1 (319th to 591st aa) fetched a spike glycoprotein [bat coronavirus RaTG13] and S1 protein partial [SARS coronavirus GD322] as homologs. Pairwise sequence alignments of the three sequences show that although the spike proteins of all three CoV are highly similar they are not identical (Figure 2A, horizontal arrows), which may be the reason for the higher binding affinity of the COVID-19 spike protein to the human ACE2 receptor. Homology modeling of SARS-CoV-2 RBD subdomain-1 (319th to 591st aa) in the SWISS-MODEL automated server developed a template-based model of the SARS-CoV-2 spike glycoprotein with a single receptor-binding domain in the up configuration (Figure 2A1) with 100% sequence identity. Of the other template-based models developed, it expectedly showed a model of the structure of the SARS-CoV spike glycoprotein, conformation 2 with about 74% sequence identity (Figure 2B, B1), which shows them to be structurally and evolutionarily related.

Figure 2

Figure 2. (A) Sequence alignment of COVID-19 RBD subdomain-1 (319th to 591st) amino acid (top row) with the bat and SARS-CoV spike protein (middle and bottom row) that were fetched from BLASTp results of the COVID-19 virus RBD subdomain-1 (319th to 591st) amino acids. Note horizontal arrows that show areas of contrast between the sequences. (A1) Homology modeling of the COVID-19 virus RBD subdomain-1 (319th to 591st) amino acid developed a template (6vsb.1. A)-based model of the COVID-19 virus spike glycoprotein. (B). Homology modeling of the COVID-19 virus RBD subdomain-1 (319th to 591st) amino acid developed a template-(5x5b.1.A) based model of the prefusion structure of SARS-CoV spike glycoprotein in conformation 2 (B1) with 73.96% sequence identity. [Uniprot and SWISS-MODEL automated server were used for sequence alignments and development of the templates and models, respectively.]

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5. A Proposed Cascade of Cerebral Involvement in the COVID-19 Infections

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The dissemination of COVID-19 in the systemic circulation or across the cribriform plate of the ethmoid bone (Figure 1) during an early or later phase of the infection can lead to cerebral involvement as has been reported in the past for SARS-CoV affected patients. (3) The presence of the COVID-19 virus in the general circulation understandably enables it to pass into the cerebral circulation (Figure 1A–C) where the sluggish movement of the blood within the microcirculation could be one of the factors that may facilitate the interaction of the COVID-19 virus spike protein with ACE2 expressed in the capillary endothelium. Subsequent budding of the viral particles from the capillary endothelium and damage to the endothelial lining can favor viral access to the brain (Figure 1B). Once within the milieu of the neuronal tissues, its interaction with ACE2 receptors (Figure 1C, D) expressed in neurons (2) can initiate a cycle of viral budding accompanied by neuronal damage without substantial inflammation as has been seen with cases of SARS-CoV (3) in the past. It is important to mention here that, long before the proposed anticipated neuronal damages occur, the endothelial ruptures in cerebral capillaries accompanied by bleeding within the cerebral tissue can have fatal consequences in patients with COVID-19 infections. The movement of the COVID-19 virus to the brain via the cribriform plate close to the olfactory bulb can be an additional pathway that could enable the virus to reach and affect the brain. Additionally, the findings like an altered sense of smell or hyposmia in an uncomplicated early stage COVID-19 patient should be investigated thoroughly for CNS involvement.

6. Conclusions and Future Directions

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Autopsies of the COVID-19 patients, detailed neurological investigation, and attempts to isolate SARS-CoV-2 from the endothelium of cerebral microcirculation, cerebrospinal fluid, glial cells, and neuronal tissue can clarify the role played by this novel COVID-19 causing coronavirus in the ongoing mortalities as has been in the recent outbreak. It is important to mention here that although the cerebral damage may complicate a COVID-19 infection, it appears that it is the widespread dysregulation of homeostasis caused by pulmonary, renal, cardiac, and circulatory damage that proves fatal in COIVD-19 patients. With that being said, a dominant cerebral involvement alone with the potential of causing cerebral edema in COVID-19 can take a lead in causing death long before systemic homeostatic dysregulation sets in. Access of the COVID-19 virus to the brain via the transcribrial route, as described previously for other CNS targeting pathogens, (7) could have been the case in a recently reported patient with hyposmia and the cases of acute respiratory failure in COVID-19, (5) which needs to be further elucidated by isolating the SARS-CoV-2 virus from the zones that are in proximity to the olfactory bulb. It is expected that the differences in the sequence of spike proteins between COVID-19 virus and SARS-CoV (Figure 2A) will enable scientists to identify epitopes in COVID-19 virus for the development of monoclonal antibodies against this virus. With the recent COVID-19 outbreak, there is an urgent need to understand the neurotropic potential of the COVID-19 virus in order to prioritize and individualize the treatment protocols based on the severity of the disease and predominant organ involvement. Also, a staging system based on the severity and organ involvement is needed in COVID-19 in order to rank the patients for aggressive or conventional treatment modalities.

Author Information

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  • Corresponding Author
  • Authors
    • Areeba Khaleeq - Department of Biological and Biomedical Sciences, Aga Khan University, Karachi 74800, Pakistan
    • Usman Ali - Medical College, Aga Khan University, Karachi 74800, Pakistan
    • Hira Syeda - Department of Biosciences, Mohammad Ali Jinnah University, Karachi 75400, Pakistan
  • Funding

    This project was partly funded by Aga Khan University.

  • Notes
    The authors declare no competing financial interest.

    The terms COVID-19 virus and SARS-CoV-2 are used in this paper, that refer to the novel coronavirus involved in the ongoing outbreak.

Acknowledgments

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The authors would like to thank the staff and faculty members of the Department of Biological & Biomedical Sciences, Aga Khan University, who, despite their busy schedule, made it to the COVID-19 presentations made by the authors and provided them with their input on the rationale of this study. The authors would also like to acknowledge the efforts of Ms. Preet Katyara for her critical review of our paper.

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  • Abstract

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    Figure 1

    Figure 1. Tissue distribution of ACE2 receptors in humans. Viremia (A) disseminates the COVID-19 virus throughout the body via the bloodstream (B). Neurotropism may occur via circulation and/or an upper nasal trancribrial route that enables the COVID-19 to reach the brain (C) and bind and engage with the ACE2 receptors (D, blue). COVID-19 docks on the ACE2 via spike protein (D, golden spikes). Shown are lungs, heart, kidneys, intestines, brain, and testicles that are well-known to express ACE2 receptors and are possible targets of COVID-19.

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    Figure 2

    Figure 2. (A) Sequence alignment of COVID-19 RBD subdomain-1 (319th to 591st) amino acid (top row) with the bat and SARS-CoV spike protein (middle and bottom row) that were fetched from BLASTp results of the COVID-19 virus RBD subdomain-1 (319th to 591st) amino acids. Note horizontal arrows that show areas of contrast between the sequences. (A1) Homology modeling of the COVID-19 virus RBD subdomain-1 (319th to 591st) amino acid developed a template (6vsb.1. A)-based model of the COVID-19 virus spike glycoprotein. (B). Homology modeling of the COVID-19 virus RBD subdomain-1 (319th to 591st) amino acid developed a template-(5x5b.1.A) based model of the prefusion structure of SARS-CoV spike glycoprotein in conformation 2 (B1) with 73.96% sequence identity. [Uniprot and SWISS-MODEL automated server were used for sequence alignments and development of the templates and models, respectively.]

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      Baig, A. M. (2016) Primary Amoebic Meningoencephalitis: Neurochemotaxis and Neurotropic Preferences of Naegleria fowleri. ACS Chem. Neurosci. 7 (8), 1026– 9,  DOI: 10.1021/acschemneuro.6b00197
      7
      Primary Amoebic Meningoencephalitis: Neurochemotaxis and Neurotropic Preferences of Naegleria fowleri
      Baig, Abdul Mannan
      ACS Chemical Neuroscience (2016), 7 (8), 1026-1029CODEN: ACNCDM; ISSN:1948-7193. (American Chemical Society)
      A review. Naegleria fowleri causes one of the most devastating necrotic meningoencephalitis in humans. The infection caused by this free-living amoeba is universally fatal within a week of onset of the signs and symptoms of the disease called primary amoebic meningoencephalitis (PAM). In all the affected patients, there is always a history of entry of water into the nose. Even though the diagnostic and treatment protocols have been revised and improved, the obstinate nature of the disease can be gauged by the fact that the mortality rate has persisted around ∼95% over the past 60 years. Some of the unanswered questions regarding PAM are is there a neurochem. basis of the chemotaxis of N. fowleri to the brain. What immune evasion means occurs preceding the neurotropic invasion. What is the contribution of the acute inflammatory response in the fatal cases. Can a combination of antiamoebic drugs with antagonism of the acute inflammation help save the patient's life. As prevention remains the most valuable safeguard against N. fowleri, a quicker diagnosis, better understanding of the pathogenesis of PAM coupled with testing of newer and safer drugs could improve the chances of survival in patients affected with PAM.
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