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Oxidative stress is a common component of obesity, being frequently present in insulin-sensitive tissues and the vasculature.
However, despite much effort, it remains unclear to what extent oxidative stress contributes to obesity-associated metabolic
abnormalities such as insulin resistance, steatosis/dyslipidemia and cardiovascular disease while the identities of the sources
of reactive species and the allied redox-sensitive pathways that mediate the effects of oxidative stress in obesity remain elusive.
Data form our laboratory have identified a substantial source of reactive species in obesity to be Xanthine Oxidoreductase
(XOR) which oxidizes hypoxanthine to xanthine and xanthine to Uric Acid (UA) while reducing O2 to O2- and H2O2. This
is evidenced by a significant elevation of XOR activity in both animal models of obesity and in the clinic. However, recent
reports have identified XOR as a nitrite reductase and thus a source of salutary NO under conditions where dietary nitrite
supplementation results in elevated nitrite levels in plasma and tissues. As such, we compared the impact of XOR inhibition
versus dietary nitrite supplementation on metabolic and cardiopulmonary dysfunction in a preclinical model of diet-induced
obesity. Our results demonstrate salutary outcomes from XOR inhibition; yet, the greatest benefitbeing afforded by dietary
nitrite. For example, treatment with nitrite reduced oxidative stress, improved impaired glucose tolerance and diminished
hemodynamic indices related to pulmonary arterial hypertension.We conclude that dietary nitrite supplementation may be a
beneficial strategy to reduce both metabolic and cardiovascular dysfunction associated with obesity by altering XOR product
formation from oxidants to NO.