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Patients with acute COVID-19 infection have higher amounts of the cytokine IL-26 in their blood, according to researchers at Sweden's Karolinska Institutet. Furthermore, high IL-26 levels are associated with an increased inflammatory response, which indicates severe cases of the disease. The findings, published in Frontiers in Immunology, suggest that IL-26 may be a biomarker for severe COVID-19.Vaccines for SARS-CoV-2 have proved effective at reducing the number of cases of severe COVID-19. However, the emergence of new viral variants, limited distribution of the vaccine and declining immunity are problems that drive scientists to find more efficacious treatments for the disease."We need to understand more about underlying immunological mechanisms in order to find better treatments. There is also a need for improved diagnostics in COVID 19-patients," says Eduardo Cardenas, postdoc researcher at the Institute of Environmental Medicine, Karolinska Institutet, and principal author of the new pilot study.The researchers have tried, for the first time, to ascertain whether immune signalling via the cytokine interleukin-26 (IL-26) is involved in severe COVID-19."We already know that IL-26 is engaged in mobilising immune cells that combat bacterial infections in the lungs and also in chronic respiratory disease in humans," says the study's last author Anders Linden, consultant and professor at the Institute of Environmental Medicine, Karolinska Institutet. "What's more, IL-26 has antiviral and antibacterial effects."To study how the molecule is involved in COVID-19, the scientists recruited 49 patients who had been hospitalised with SARS-CoV-2-infection, 44 of whom had severe symptoms and needed oxygen therapy. The patients were recruited at a hospital in Stockholm from June 2020 to January 2021. A control group of 27 healthy individuals was also recruited during the same period. The researchers then measured levels of IL-26 protein and other inflammatory compounds in the blood."We can show for the first time that blood levels of the cytokine IL-26 are much higher in patients with COVID-19 than in healthy controls," says Dr Cardenas.The researchers could also see that the increase was associated with the so-called cytokine storm - an excessive and dangerous inflammatory response that signifies severe cases of COVID-19."Our discovery gives us a potential biomarker for severe COVID-19, but given the antiviral effects of IL-26, we may also have identified a new therapeutic target," says Professor Linden.According to Dr Cardenas, the results are promising but are preliminary and warrant further study with a larger patient cohort."Such a study is on the way and can give more information on the clinical value of measuring IL-26 in COVID-patients, such as whether the levels reflect the severity of the disease.( With inputs from ANI )Disclaimer: This post has been auto-published from an agency feed without any modifications to the text and has not been reviewed by an editor

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