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Sodagar, A.;  Javed, R.;  Tahir, H.;  Razak, S.I.A.;  Shakir, M.;  Naeem, M.;  Yusof, A.H.A.;  Sagadevan, S.;  Hazafa, A.;  Uddin, J.; et al. COVID-19 in the Brain and Nervous System. Encyclopedia. Available online: https://encyclopedia.pub/entry/25533 (accessed on 03 July 2024).
Sodagar A,  Javed R,  Tahir H,  Razak SIA,  Shakir M,  Naeem M, et al. COVID-19 in the Brain and Nervous System. Encyclopedia. Available at: https://encyclopedia.pub/entry/25533. Accessed July 03, 2024.
Sodagar, Aisha, Rasab Javed, Hira Tahir, Saiful Izwan Abd Razak, Muhammad Shakir, Muhammad Naeem, Abdul Halim Abdul Yusof, Suresh Sagadevan, Abu Hazafa, Jalal Uddin, et al. "COVID-19 in the Brain and Nervous System" Encyclopedia, https://encyclopedia.pub/entry/25533 (accessed July 03, 2024).
Sodagar, A.,  Javed, R.,  Tahir, H.,  Razak, S.I.A.,  Shakir, M.,  Naeem, M.,  Yusof, A.H.A.,  Sagadevan, S.,  Hazafa, A.,  Uddin, J.,  Khan, A., & Al-Harrasi, A. (2022, July 26). COVID-19 in the Brain and Nervous System. In Encyclopedia. https://encyclopedia.pub/entry/25533
Sodagar, Aisha, et al. "COVID-19 in the Brain and Nervous System." Encyclopedia. Web. 26 July, 2022.
COVID-19 in the Brain and Nervous System
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This entry is adapted from the peer-reviewed paper 10.3390/biom12070971

COVID-19 can spread throughout the central nervous system, impacting the brain and spinal cord, and neurological symptoms could explain this in people infected with long-term infection.

COVID-19 brain neurological manifestations

1. Neurological Effects of COVID-19

Coronavirus was initially observed as a pathogen responsible for respiratory illness with cough, shortness of breath, fever, muscle pain, headache, sore throat with loss of taste and smell. These symptoms were declared by the center for disease control (CDC). Still, this virus was later considered a pathogen that negatively impacted multiple organs. Its heterogeneity showed more neurological disorders, indicating its RNA in the cerebrospinal fluid of its infected patients in acute and long-term phases [1]. SARS-CoV-2 may directly impact the white and grey matter of the brain and spine with demyelinating lesions and symptoms of seizures, ataxia, dizziness, and cerebrovascular illness. French and Turkish scientists also reported neurological symptoms during coronavirus infection in patients with agitation, delirium, ischemic stroke, and encephalopathy, along with anosmia and dysgeusia, while headache is the most common manifestation [2]. This viral infection of the respiratory tract has the strength to cause psychiatric and neurological problems because COVID-19 is neurotropic in nature and has the strength to enter into the central nervous system, while antibodies of COVID-19 have been observed in deceased patient’s cerebrospinal fluid. It is essential to consider COVID-19 as a neuropsychiatric manifestation of long-term complications [3].
Another study observed that obscured monocular vision, dysphoria, vomiting, deliria, coma, brain herniation, loss of consciousness, up-rolling eyeballs, vomiting, four-limb twitching, confusion, and seizures are common in patients infected with the novel coronavirus [1]. However, the neurotropic and neuro-invasive symptoms were observed since the first case of coronavirus in human in 2003 [4]. A few neurological manifestations due to novel coronavirus are mentioned in Table 1.
Table 1. List of neurological disorders caused by SARS-CoV-2 infection.
Disorder Mean Age (Years) Onset of Disease Percentage of Infected Patients Effect Treatment/Drug Reference
Dizziness 39 Shortly after COVID-19 16.8% Inflammation of the inner ear nerve that connected to the brain Betahistine, danshenchuandomazine, meclizine, benzodiazepine, steroids, vestibular rehabilitation [1][5][6][7]
Ischemic stroke and hemorrhage 67.4 In the first week of respiratory symptoms with moderate pulmonary involvement 83.7% stroke and 20.8% hemorrhage Numbness or weakness in the face, arm, or leg on one side of the body, confusion, difficulty speaking, dizziness, loss of balance, and severe headache Apixaban 5 mg twice daily, enoxaparin 1 mg/kg every 12 h [8][9][10][11]
Encephalopathy 66 At the time of documented COVID-19 infection 8.7% while 31.8% in the case study of 509 COVID-19 hospitalized patients Confusion, non-oriented to time, person, or place, seizures, and sleepiness High-dose IV steroids, IV immunoglobulin, and immunomodulators (e.g., rituximab) [12][13][14]
Delirium 77.7 As a sixth primary symptom of coronavirus 28% Confusion, disorientation, inattention, and cognitive disturbances commonly affect older persons Haloperidol, melatonin as prophylaxis [15][16]
Anosmia and Dysguesia 47 Initial symptoms for coronavirus infected patients 47% 54/114 patients and 5.1% anosmia while 5.6% dysgeusia in another study of 214 infected patients Official symptoms for COVID-19 Caffeine in coffee [17][18][19][20]
Dysautonomia (also known as secondary COVID-19 infection) 48 Onset 6 weeks following initial COVID-19 symptoms, within the last week of the illness, also seen symptom onset occur within three months of recovery. 50% Postural lightheadedness and near-syncope, fatigue, activity intolerance, hypertensive response, and orthostatic hypotension Cefazolin and acebutolol (in case of significant hypertension) [21][22][23][24]
Microbleed 67.7 Fever, productive cough, myalgias, headache during coronavirus attack 24.4% Confusion, agitation, and delayed recovery of consciousness Co-amoxicillin, hydroxychloroquine, piperacillin, tazobactam, azithromycin, lopinavir, ritonavir, levofloxacin, tazobactam [25][26]
Coma 66 Severe illness due to viral attack 15% Breathlessness, an erratic heart rate and fatigue, altered mental status, and inability to wakeup off leads to unconsciousness Modafinil and carbidopa/levodopa, amantadine, aspirin, statin [27]
Brain herniation, cerebral edema 57 Positive for SARS-CoV 2, fatigue, and fever 3.9% Hypertension, dyspnea, nausea, vomiting, diarrhea, and multiple juxtacortical hemorrhages (CT scan observation) Midazolam, low dose norepinephrine [27]
Cerebral ataxia and myoclonus 59.6 Acute onset within one month of COVID-19 40% ataxia and 46.7% Myoclonus Spontaneous, action-induced, posture-induced, and mild dysarthria Methylprednisolone daily for 5 days, clonazepam after 10 days of symptoms, levetiracetam started on day 14 [28]
Seizures 76- and 82-years old patient’s case history Patients suffering from coronavirus 23% detected by anti-CoV IgM Convulsive activity and subtle twitching Antiseizure medication (ASM) therapy, brivaracetam, lacosamide, carbamazepine, phenytoin, phenobarbital, benzodiazepines, valproic acid, vancomycin, meropenem, and Acyclovir for CSF coverage, all drugs should be prescribed cautiously by following doctor’s advice in which patient’s health history is essential [4][29]

2. Routes for Entry of COVID-19 into the Brain and Neurological Manifestations

COVID-19 can spread throughout the central nervous system, impacting the brain and spinal cord, and neurological symptoms could explain this in people infected with long-term infection [30]. This novel virus enters into the brain and tissues through multiple ways, but there is a semi-permeable membrane, a blood–brain barrier that allows only selective nutrients, pathogens, and toxins to flow to and from the brain. This barrier strictly controls the neuronal microenvironment while maintaining neurons’ normal function. However, in the case of other diseases, this blood–brain barrier breaks down, and this dysfunction leads to the cause of infection, that is neurological deficits [31].
Brain cells can be harmed due to the triggered production of immune molecules and reduced blood flow to the brain. Sometimes, this contagious and deadly coronavirus directly enters the brain and affects its functionality. Viruses may spread to the brain via the lining of the nasal cavity in olfactory mucosa that borders the brain and infects astrocytes over other cells, and neurological symptoms can be described in the brain [32]. About 0.04% of long-term severe acute respiratory syndrome (SARS) infected patients showed symptoms of the affected central nervous system, and this problem is becoming scarier, while only 0.2% of neurological symptoms were observed with MERS [33]. There are possibly three main ways (olfactory bulb, angiotensin-converting enzyme (ACE) pathway, and cytokine storm) that coronavirus follows to enter the brain, as shown in Figure 1.
Biomolecules 12 00971 g002
Figure 1. The overview of possible entry routes of SARS-CoV-2 in the brain.

2.1. Coronavirus Enters the Brain via ACE2 Pathway

The COVID-19 virus enters the brain via angiotensin-converting enzyme (ACE)-2 receptors present in the CNS and is particularly expressed in the nasal mucosa [34]. A transmembrane protein ACE-2 (Angiotensin-converting enzyme-2) is typically recognized for its carboxypeptidase activity and its physiological role in the renin-angiotensin system (RAS) [35]. ACE-2 (Angiotensin-converting enzyme-2) has an ability to express in many tissues of the brain, and novel coronavirus can directly interact with this enzyme in the capillary endothelium due to which the blood–brain barrier is devastated, which enhances virus entry into the brain and affect the central nervous system, because ACE-2 can express throughout the brain. Viral mRNA also interacts with ACE-2 in COVID-19 infected patients. Increased neurological infections are due to a novel coronavirus that is promoted to enter the central nervous system because of the abundance of ACE-2 enzymes in the brain [36][37]. Viral spike protein interacts with the ACE-2 receptor, an important regulator of the renin-angiotensin system (RAS). Its expression has also been studied in the retina, cerebellum, cerebrum, and olfactory mucosa [38]. The virus enters the brain via other receptor cells, too, like neuropilin-1 (NRP1), basigin (BSG; CD147), cathepsin L (CTSL), and serine protease 2 and 4 (TMPRSS2/4) [38][39][40].

2.2. Coronavirus Entry into the Brain via Olfactory Pathway

The presence of a high amount of virus in the nasal epithelium suggests that novel coronavirus can travel to the brain through olfactory nerves. Such viruses that can invade neurons can bind with olfactory receptor neurons [41]. nCoV-19 migrates from the cribriform plate by following the trigeminal pathway and penetrating the olfactory mucosa, which causes smell loss and may enter the brain [42]. The virus attaches to olfactory receptors, enters the neuroepithelium, then spreads in the brain stem, thalamus, and medulla oblongata and causes serious disorders. Postmortem reports also provided evidence of its presence in neural endothelial cells in frontal lobe tissues [43].

2.3. Coronavirus Entry in the Brain via Cytokine Storm

Cerebrospinal fluid and the blood–brain barrier help in creating a balanced environment to protect the brain from viruses and other pathogens, but these can enter via peripheral nerves and olfactory sensory neurons. SARS-CoV-2 trigger pro-inflammatory microglia phenotype (M1 phenotype) that activate proinflammatory cytokines and enhance neurodegenerative disorders [44]. Activating proinflammatory cytokines enhances neutrophil activation, resulting in the characteristic cytokine storm. Interleukin (IL)-1, IL-6, IL-12, interferon (IFN) γ, and tumor necrosis factor (TNF) α, which mainly targets the lung tissue, are also released along with proinflammatory cytokines. Damaged neuroepithelium cells cause inflammation and activate cytokine storms that damage neurons and neurological disorders. Cytokine storm is also associated with immune effector cell-associated neurotoxicity syndrome (ICANS) and other encephalopathies associated with cytokine storm [45].
Increased levels of cytokines, including Macrophage-Colony Stimulating Factor (M-CSF), interferon γ-induced protein (IP-10), and Macrophage Inflammatory Protein 1-α (MIP1-α). The activated cytokine storm results in a hyperactive immune response that leads to inflammation and inflammatory cytokines, followed by a delayed production of interferons (IFN). The released cytokines stimulate the neutrophils that triggers inflammation when the virus replicates within the macrophages resulting in apoptosis [46].

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Subjects: Immunology; Infectious Diseases
Contributors MDPI registered users' name will be linked to their SciProfiles pages. To register with us, please refer to https://encyclopedia.pub/register :
Aisha Sodagar
,
Rasab Javed
,
Hira Tahir
,
Saiful Izwan Abd Razak
,
Muhammad Shakir
,
Muhammad Naeem
,
Abdul Halim Abdul Yusof
,
Suresh Sagadevan
,
Abu Hazafa
,
Jalal Uddin
,
Ajmal Khan
,
Ahmed Al-Harrasi
View Times: 544
Entry Collection: COVID-19
Revisions: 4 times (View History)
Update Date: 29 Jul 2022
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