Abstract
Pediatric inflammatory multisystem syndrome temporally associated with SARS-CoV-2 (MIS-C) is characterized by persistent fever and evidence of single or multiorgan dysfunction, and laboratory evidence of inflammation, elevated neutrophils, reduced lymphocytes, and low albumin. The pathophysiological mechanisms of MIS-C are still unknown. Proinflammatory mediators, including reactive oxygen species and decreased antioxidant enzymes, seems to play a central role. Virus entry activates NOXs and inhibits Nrf-2 antioxidant response inducing free radicals. The biological functions of nonphagocytic NOXs are still under study and appear to include: defense of epithelia, intracellular signaling mechanisms for growth regulation and cell differentiation, and post-translational modifications of proteins. This educational review has the aim of analyzing the newest evidence on the role of oxidative stress (OS) in MIS-C. Only by relating inflammatory mediators to OS evaluation in children following SARS-CoV-2 infection will it be possible to achieve a better understanding of these mechanisms and to reduce long-term morbidity. The link between inflammation and OS is key to developing effective prevention strategies with antioxidants to protect children.
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