The SARS-CoV-2 infection in the brain begins with the spike protein S1 binding to the host receptor ACE2 ( Fig. suggested the synapse as a vulnerable region of the brain to neurological disorders after viral contamination. Considering the combined evidence, some mechanisms have been suggested to understand the relationship between neurological disorders and imbalance of trace elements in the brain after viral contamination. Conclusion Trace elements play important roles in viral infections, such as helping to activate immune cells, produce antibodies, and inhibit virus replication. However, the relationship between trace elements and virus infections is complex since the specific functions of several elements remain largely undefined. Therefore, there is still a lot to be explored to understand the biochemical mechanisms involved between trace elements and viral infections, especially in the Complanatoside A brain. strong class=”kwd-title” Keywords: Viral contamination, Trace elements, Neurological disorders, Immunity system, Antiviral Graphical Abstract Open in a separate window Nomenclature ACE2angiotensin-converting enzyme 2APPamyloid precursor proteinARDSacute respiratory distress syndromeAsarsenicASDautism spectrum disorderAPbeta-amyloid peptideBBBblood-brain barrierBBEbrainstem encephalitisCARcarnosineCdcadmiumCNScentral nervous systemCOVID-19coronavirus diseaseCOX-2prostaglandin endoperoxide synthase 2CucopperFDAFood and Drug AdministrationFeironGABAg-aminobutyric acidGBSGuillain Barr syndromeGPxglutathione peroxidaseGSHglutathioneGSSHglutathione dissulfiteHghuman T cell leukemia virus type 1HTLV-1human T cell Rabbit polyclonal to Parp.Poly(ADP-ribose) polymerase-1 (PARP-1), also designated PARP, is a nuclear DNA-bindingzinc finger protein that influences DNA repair, DNA replication, modulation of chromatin structure,and apoptosis. In response to genotoxic stress, PARP-1 catalyzes the transfer of ADP-ribose unitsfrom NAD(+) to a number of acceptor molecules including chromatin. PARP-1 recognizes DNAstrand interruptions and can complex with RNA and negatively regulate transcription. ActinomycinD- and etoposide-dependent induction of caspases mediates cleavage of PARP-1 into a p89fragment that traverses into the cytoplasm. Apoptosis-inducing factor (AIF) translocation from themitochondria to the nucleus is PARP-1-dependent and is necessary for PARP-1-dependent celldeath. PARP-1 deficiencies lead to chromosomal instability due to higher frequencies ofchromosome fusions and aneuploidy, suggesting that poly(ADP-ribosyl)ation contributes to theefficient maintenance of genome integrity leukemia virus type 1IgimmunoglobulinIL-1interleukin 1 betaLA-ICP-MSlaser ablation-inductively coupled plasma-mass spectrometryLiLithiumMAGT1magnesium transporter 1MDMenkes diseaseMERS-CoVmiddle east respiratory syndrome-associated coronavirusMgmagnesiumMHRAMedicines and Healthcare products Regulatory AgencyMnmanganeseMpromain protease of SARS-CoV-2MTmetallothioneinsNDneurodegenerative diseasesNF-kBnuclear factor kappa-BNF-kBnuclear factor kappa-BNF-tumor necrosis factor C alphaNinickelNKCsnatural killer cellsNMDAN-methyl-D-aspartatePbleadPrPprion proteinPrPCcellular prion proteinRdRpRNA-dependent RNA polymeraseRNSreactive nitrogen speciesROSreactive oxygen speciesSARS-CoV-2severe acute respiratory syndrome-associated coronavirus-2SCCsodium copper chlorophyllinSeseleniumSODsuperoxide dismutaseSP-ICP-MSsingle particle-ICP-MSSV-ICP-MSsingle virus ICP-MSTIBCtotal iron-binding capacityTrxRsthioredoxin reductaseWDWilsons diseaseZFPzinc-finger proteinsZnzincZnTZn transporter 1.?Introduction Coronavirus disease (COVID-19) is currently one of the main causes of death worldwide, resulting millions of deaths since the end of 2019 [1], [2], [3]. COVID-19 is usually caused by the SARS-CoV-2 (severe acute respiratory syndrome-coronavirus-2) virus that originated in Wuhan, China, and spread rapidly around the Complanatoside A world [4]. Studies in animal and human have reported that this viral responses of innate and adaptive immune machinery depend around the hosts metabolism, which includes age, sex, smoking habits, co-existing medical conditions, and especially nutritional status. In this sense, the balance between immune activation and micronutrients is crucial to combat viral contamination. Therefore, several trace elements have been identified as essential to immunomodulatory effects, since many components of innate immunity can be influenced by elements such as zinc (Zn), selenium (Se), iron (Fe), copper (Cu), manganese (Mn), among others [2], [5]. Trace elements can act as cofactors for many enzymes, such as, superoxide dismutase (SOD), RNA polymerase, and glutathione peroxidase (GPx), and can mediate vital biochemical functions, modifying oxidant tissue injury mediated by oxidants and eliminating reactive oxygen species (ROS) in response to contamination [2], [6], [7]. Furthermore, the deregulation of element homeostasis during contamination can play an essential role in virus survival since metals are cofactors of important metalloproteins responsible for virus attachment to the host. For example, Zn, Fe, and Cu are some of the most common metals that bind to proteins associated with viral infections, participating in Complanatoside A genome maturation (RNA or DNA), activation, and catalytic mechanisms, as well as, initial integration processes, and the protection of newly synthesized DNA [2]. Initially, it was believed that COVID-19 contamination only affected the respiratory tract, however the appearance of neurological, hematological, and gastrointestinal, symptoms attested its more systemic character [4], [8], [9], [10], [11]. For example, it was reported that nearly 40% of critically ill COVID-19 patients presented strokes, cognitive dysfunction, depressive disorder, psychosis, and delirium, suggesting that this virus may predispose to several neurological disorders [4], [12]. In the case of neurological dysfunction, some syndromes can vary depending on which part of the brain is infected. For example, exacerbation of pre-existing cognitive, motor and non-motor symptoms has been frequently observed, indicating viral neurotropism [12]. In addition, migration defects in the ventral cerebellum, olfactory bulbs hypoplasia and delayed-onset neuronal dropout in the hippocampus were reported as neurological dysfunction after viral contamination [13]. In the brain, specifically, viral contamination can cause dyshomeostasis of some trace elements that promote complex biochemical reactions in specialized neurological functions, such as: (i) neurotransmitter synthesis; (ii) neural information processing; (iii) redox processes; (iv) oxygen storage; (v) myelination; and (vi) electron transport [2], [5], [7], [14], [15], [16], [17], [18], [19], [20]. Insufficient immunity, high viral load, increased age, history of neurotrophic viral contamination, glucocorticosteroids administration, and increased hospitalization have been reported as factors in the spread of SARS-CoV-2 to the central nervous system. Neural proliferation can occur in the cells.