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View Affiliations Affiliations: I. This is an open access article distributed under the terms of Creative Commons Attribution License. Zinc is known to modulate antiviral and antibacterial immunity and regulate inflammatory response. This effect may underlie therapeutic efficiency of chloroquine known to act as zinc ionophore. However, further clinical and experimental studies are required. Introduction Zinc is an essential metal being involved in a variety of biological processes due to its function as a cofactor, signaling molecule, and structural element.
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It is involved in the regulation of carbohydrate and lipid metabolism, as well as the functioning of the reproductive, cardiovascular, and nervous system 1. At the same time, the most critical role of zinc is demonstrated for the immune system.
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- Zinc and respiratory tract infections: Perspectives for COVID‑19 (Review)
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Briefly, zinc regulates proliferation, differentiation, maturation, and functioning of leukocytes spb diabetes treatment center lymphocytes 2. Zinc plays a signaling role involved in the modulation of inflammatory responses 3.
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It is also a component of nutritional immunity 4. Correspondingly, alteration of zinc status significantly affects immune response resulting in increased susceptibility to inflammatory and infectious diseases including acquired immune deficiency syndrome, measles, malaria, tuberculosis, and pneumonia 5. Earlier data demonstrate that populational Zn status is associated with the prevalence of respiratory tract infections in children and adults 67.
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Moreover, certain groups of people, including infants, especially preterm ones, and elderly, are considered to be at high risk of zinc deficiency and its adverse effects 9. Under zinc deficiency condition, organisms are more susceptible to toxin-producing bacteria or enteroviral pathogens that activate guanylate and adenylate cyclases, stimulating chloride secretion, causing diarrhea and diminishing absorption of nutrients, thus exacerbating an already compromised mineral status.
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In addition, zinc deficiency may impair the absorption of water and electrolytes, delaying the termination of normally self-limiting gastrointestinal disease episodes During chronic deficiency, the production of pro-inflammatory cytokines increases, influencing the outcome of a large number of inflammatory, metabolic, neurodegenerative and immune diseases Diseases such as rheumatoid arthritis, diabetes 12atherosclerosis and obesity 13impaired cognitive function 14as well as age-related macular degeneration AMD may be due to zinc deficiency, worsening chronic inflammation spb diabetes treatment center triggering oxidative stress.
The viruses from the Coronaviridae family are zoonotic viruses that can be transmitted from animals to humans. The bat is considered the reservoir diabeteses retinopathia kezelése these viruses, but other intermediate animals can also transmit the virus to humans Currently, the prevalence of COVID exceeds 1, cases resulting in 92, deaths worldwide COVID predominantly affects the respiratory system resulting in pneumonia and acute respiratory distress syndrome 24leading to the requirement of mechanical ventilation The risk is also increased by modern life in which individuals are exposed to a multitude of chemicals, even in low doses that in the long-term predispose to chronic diseases and metabolic disturbances 27 - Preexisting chronic metabolic diseases including diabetes, cardiovascular diseases 32and obesity 33 are considered as risk factors for increased COVID susceptibility and mortality.
Due to the clearly demonstrated role of zinc in immunity 2and impaired zinc status in ageing 35metabolic diseases including spb diabetes treatment center, obesity, and cardiovascular diseases 13it is speculated that zinc compounds may be used as an adjunct therapy in COVID treatment 36 for increasing antiviral resistance Of note, zinc was earlier suggested as the potential agent for immune support and prevention of H1N1 influenza 'swine flu' Zinc is considered as the potential supportive treatment in therapy of COVID infection due to its immune modulatory effect, as well as direct antiviral effect However, the existing data will be only mechanistically discussed in this review, as direct data on anti-COVID effects of zinc are absent to date.
Of note, recent trials have indicated efficiency of chloroquine antiviral activity as a treatment of COVID 40although the intimate mechanisms of its antiviral activity require further investigation Moreover, the authors also propose that chloroquine-mediate zinc influx may underlie anticancer activity of the compound In this view zinc supplementation without chloroquine might have similar positive effects without adverse side-effects spb diabetes treatment center chloroquine treatment Hypothetically, such an effect may be also observed using other zinc ionophores like quercetin and epigallocatechin-gallate 44 with substantially lower toxicity, although clinical trials supported by experimental in spb diabetes treatment center studies are required to support this hypothesis.
In view of the presence of similar critical Zn-containing sites, Zn-ejector drugs e.
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Speth et al 50 demonstrated that zinc exposure µM was shown to reduce recombinant human ACE-2 activity in rat lungs.
Although this concentration is close to physiological values of total zinc, the modulating effect of spb diabetes treatment center on SARS-CoVACE2 interaction seem to be only hypothetical The latter may not only alter viral particle removal, but also predispose to bacterial co-infection as observed for influenza virus In turn, Zn supplementation was shown to improve ciliary budapest foglalkoztatottak száma in bronchial epithelium of Zn-deficient rats 55as well as increase ciliary beat frequency in vitro Therefore, zinc may hypothetically ameliorate nCoVinduced dysfunction of mucociliary clearance.
Generally, zinc was shown to be essential for respiratory epithelium due to antioxidant and anti-inflammatory activity 57as well as regulation of tight junction proteins ZO-1 and Claudin-1 58thus increasing its barrier functions. In turn, downregulation of tight junction protein complexes e.
In addition, loss of TJ perm selectivity in the airways results in an un-controlled leakage of high molecular weight proteins and water into the airways, which results spb diabetes treatment center the formation of alveolar edema and ARDS Zinc was shown to have a significant impact on viral infections through modulation of viral particle entry, fusion, replication, viral protein translation and further release for a number of viruses including those involved in respiratory system pathology 37 Specifically, increasing intracellular Zn levels through application of Zn ionophores such as pyrithione and hinokitiol significantly alters replication of picornavirus, the leading cause of common cold These findings generally correspond to the earlier indications of suppressive effect of zinc on rhinovirus replication originating from the early s In addition, Spb diabetes treatment center treatment was shown to increase interferon α IFNα production by leukocytes 64 and potentiate its antiviral activity in rhinovirus-infected cells Certain studies also revealed the association between Zn status and respiratory syncytial virus RSV infection.
Particularly, it has been demonstrated that whole spb diabetes treatment center zinc was significantly lower in children with RSV pneumonia Impaired zinc metabolism in perinatal alcohol exposure is associated with immunosuppression and altered alveolar macrophage activity resulting in increased susceptibility to RSV infection In turn, Zn compounds were shown to inhibit respiratory syncytial virus replication and RSV plaque formation with a more than 1,fold reduction at 10 µm Zn preincubation It is also notable that zinc deficiency was associated with higher mortality and adverse long-term outcome in influenza-MRSA bacterial superinfection 73also underlining the importance of considering the risk of bacterial coinfection.
Despite the presence of experimental findings on the protective effect of zinc supplementation against respiratory virus infections, clinical and epidemiological data are still to be elaborated and spb diabetes treatment center.
Pneumonia in adults and the elderly Zinc is essential spb diabetes treatment center the immune system and elderly people have an increased probability for zinc deficiency Low Zn status was considered as the potential risk factor for pneumonia in elderly. The incidence of severe pneumonia was significantly higher in Irani patients with low Zn status, although the mean duration of fever, tachycardia, and tachypnea only tended to be longer, although not significant Correspondingly, serum Zn levels were found deficient at the onset of acute respiratory failure with the lowest values observed in septic shock patients.
However, no association between serum Zn values and day mortality or period of stay in intensive cukorbetegség sarok unit was observed At the same time, certain studies failed to reveal any improvement in pneumonia when administered along with standard antibiotic treatment, although the period of supplementation was only 4 days A detailed study by Boudreault et al 82 demonstrated that low plasma Zn predisposes to ventilator-induced injury in intensive care, being related to the role of metallothionein system in lung protection.
These data corroborate the results of the experimental study demonstrating aggravation of ventilation-induced lung injury in Zn deficient rats In Indian patients high plasma zinc levels were found to be associated with reduced mortality from sepsis as well as lower h SOFA scores Moreover, persistent low serum Zn levels were associated with increased risk of recurrent sepsis in critically ill patients Altogether, the existing data demonstrate an association between zinc status and pneumonia in adults and elderly, as well as its complications including respiratory failure, ventilator-induced injury, and sepsis.
In view of high incidence of Zn deficiency in infants, the existing data on the association between Zn status and pneumonia in children is also discussed.
High incidence of pneumonia in developing countries has been considered as the consequence of zinc deficiency in the population 7. Correspondingly, a 2-fold lower level of serum Zn was observed in pediatric acute lower respiratory infection patients Significantly lower serum zinc levels were observed in children with pneumonia complicated by sepsis, mechanical ventilation, and spb diabetes treatment center of lethality Generally, indications of low zinc status in children with pneumonia provide a rationale for preventive Zn supplementation.
In contrast to the demonstrated preventive effects of Zn supplementation, data on the therapeutic effect of zinc in treatment of childhood pneumonia are conflicting Moreover, Zn spb diabetes treatment center in Zn-deficient children with pneumonia until achievement of normal serum Zn levels did not improve clinical appearance of the disease A number of studies revealed the potential efficiency of Zn supplementation in prevention of non-specified acute lower respiratory infections including bronchitis, bronchiolitis, pneumonitis.
Specifically, supplementation with 10 mg zinc gluconate in Zn-deficient children resulted in a nearly twofold reduction of the number of episodes of acute lower respiratory infections as well as the time to recovery In parallel, the impact of Zn supplementation in relation to upper respiratory tract infections was also demonstrated.
Certain studies also revealed protective effect of zinc supplementation against both acute upper and lower respiratory diseases in children Zinc and lung inflammation Inflammation plays the key role in COVID pathogenesis both at local pneumonia and systemic cytokine storm levels, and the search for adequate anti-inflammatory agents is of particular importance