The enzyme xanthine oxidase has been implicated as a generator of toxic oxygen metabolites that contribute to ischemic injury. Because substantial species variability has been demonstrated and because there are minimal human data available, the relevance of xanthine oxidase to human heart damage has been in doubt. We report the absence of xanthine oxidase activity in nine human heart biopsy spe...

In 1948 Keith et al. (1) demonstrated that in chicks fed a folic aciddeficient diet liver xanthine oxidase activity was far higher than that observed in birds receiving adequate levels of folic acid. It was postulated (2, 3) that 6-formylpteridine, a potent inhibitor of xanthine oxidase in vitro, was biologically active in controlling the oxidation of xanthine and hypoxanthine in vivo, since 6-...

Xanthine oxidase is a key enzyme responsible for hyperuricemia, a pre-disposing factor for Gout and oxidative stress-related diseases. Only two clinically approved xanthine oxidase inhibitors Allopurinol and Febuxostat are currently used for treatment of hyperuricemia. However, owing to their side effects there is a need for new non-purine-based selective inhibitors of xanthine oxidase. In the ...

One of the earliest studies reporting the presence of xanthine oxidase in rat skin was made by Barry et al. (1). Westerfeld and Richer-t (2), in a study of the distribution of this enzyme in the tissues of the white rat, confirmed this finding and reported that activity in the skin accounted for approximately 20% of the total xanthine oxidase of the rat. These authors did not study the enzyme i...

I . The oral administration of sodium molybdate caused a rapid rise of molybdenum in the milk of cows and goats fed on a low-molybdenum diet, but did not affect the xanthine oxidase activities of the milk of either species. 2. In the milks of cows not dosed with sodium molybdate, the regression of the xanthine oxidase activity ( y ) on the molybdenum content (x) was found to be (r = +0.9386; P ...

Application of cisplatin for the treatment various solid tumors is known to cause liver damage, through an increase in lipid peroxidation and reactive oxygen species production. Lycopene a powerful antioxidant agent capable preventing cells formation stronger intercellular bonds faster cellular metabolism. This study aims estimate potential lycopene induced tissue damage by studying levels seve...

1878-3317/$ e see front matter Copyright 2011, Ta doi:10.1016/j.jecm.2011.04.006 Background: Coumarin is a well-known plant-derived natural product, which is extensively used as a biologically active compound. Coumarins that possess hydroxyl groups in their benzenoid ring were shown to have potent antioxidant and radical-scavenging properties in various experimental models. Purposes: During our...

Background: Dyslipidemia constitutes a serious public health concern globally. It has been established that excessive fructose intake results in dyslipidemia; however, whether dexamethasone aggravates or alleviates fructose-induced dyslipidemia is unknown. Thus, we examined the effects of dexamethasone on dyslipidemia and hyperuricemia in high fructose-taking Wister rats. Methods: Twenty male...

The antioxidant activity of two edible medicinal plants commonly used in Malaysian traditional medicine i.e. Piper sarmentosum (kadok) and Morinda elliptica (mengkudu) were tested for antioxidant activity. The methanolic leave extracts of kadok and mengkudu, at 250ug/ml, were tested using the Xanthine/Xanthine Oxidase (X/XOD) Superoxide Scavenging assay. Both extracts showed high superoxide sca...