Confirmation of superoxide generation via xanthine oxidase in streptozotocin-induced diabetic mice

Shingo Matsumoto, Ichiro Koshiishi, Toyoshi Inoguchi, Hajime Nawata, Hideo Utsumi

研究成果: ジャーナルへの寄稿学術誌査読

100 被引用数 (Scopus)


Reactive oxygen species (ROS) may play key roles in vascular inflammation and atherogenesis in patients with diabetes. In this study, xanthine oxidase (XO) system was examined as a potential source of superoxide in mice with streptozotocin (STZ)-induced experimental diabetes. Plasma XO activity increased 3-fold in diabetic mice (50 ± 33 μU/ml) 2 weeks after the onset of diabetes, as compared with non-diabetic control mice (15 ± 6 μU/ml). In vivo superoxide generation in diabetic mice was evaluated by an in vivo electron spin resonance (ESR)/spin probe method. Superoxide generation was significantly enhanced in diabetic mice, and the enhancement was restored by the administration of superoxide dismutase (SOD) and 4,5-dihydroxy-1,3-benzene disulfonic acid (Tiron), which was reported to scavenge superoxide. Pretreatment of diabetic mice with XO inhibitors, allopurinol and its active metabolite oxipurinol, normalized the increased superoxide generation. In addition, there was a correlation (r = 0.78) between the level of plasma XO activity and the relative degree of superoxide generation in diabetic and non-diabetic mice. Hence, the results of this study strongly suggest that superoxide should be generated through the increased XO seen in the diabetic model mice, which may be involved in the pathogenesis of diabetic vascular complications.

ジャーナルFree Radical Research
出版ステータス出版済み - 7月 1 2003

!!!All Science Journal Classification (ASJC) codes

  • 生化学


「Confirmation of superoxide generation via xanthine oxidase in streptozotocin-induced diabetic mice」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。