Potential Therapeutic Approach of Melatonin against Omicron and Some Other Variants of SARS-CoV-2.

The Omicron variant (B.529) of COVID-19 caused disease outbreaks worldwide because of its contagious and diverse mutations. To reduce these outbreaks, therapeutic drugs and adjuvant vaccines have been applied for the treatment of the disease. However, these drugs have not shown high efficacy in reducing COVID-19 severity, and even antiviral drugs have not shown to be effective. Researchers thus continue to search for an effective adjuvant therapy with a combination of drugs or vaccines to treat COVID-19 disease. We were motivated to consider melatonin as a defensive agent against SARS-CoV-2 because of its various unique properties. Over 200 scientific publications have shown the significant effects of melatonin in treating diseases, with strong antioxidant, anti-inflammatory, and immunomodulatory effects. Melatonin has a high safety profile, but it needs further clinical trials and experiments for use as a therapeutic agent against the Omicron variant of COVID-19. It might immediately be able to prevent the development of severe symptoms caused by the coronavirus and can reduce the severity of the infection by improving immunity.

Why are people with glycative stress so susceptible to COVID-19 infection?

People with diabetes show an increased susceptibility to infection by SARS-CoV-2, greater incidence of pneumonia, and worse clinical outcomes. As diabetes involves high glycative stress, here we present a review of the literature regarding the potential interactions of glycative stress and COVID-19 that may help to explain some of the observed differences in outcomes of diabetic patients. Glycative stress directly suppresses immune function, leaving the body less able to deal with infection. Increased colonization of potentially pathogenic bacteria, mediated by glycative stress, such as Staphylococcus aureus, may also lead to negative outcomes during infection. The presence of S. aureus on the skin may weaken its barrier function and increase the risk of infection through the skin. Proteolytic activity necessary for the virus to enter cells may be enhanced in tissue exposed to S. aureus as well as by the bacteria's own secreted proteases. Finally, S. aureus carriage could be a risk factor for the development of secondary bacterial pneumonia during primary COVID-19 infection. In order to avoid infection and severe disease outcomes, it is important for those suspected of having diabetes to maintain strict glycemic control and take measures to avoid exposure to the virus.