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Related Experiment Videos

Changes in xanthine oxidase in ischemic rat brain.

Y Kinuta1, M Kimura, Y Itokawa

  • 1Department of Neurosurgery, Faculty of Medicine, Kyoto University, Japan.

Journal of Neurosurgery
|September 1, 1989
PubMed
Summary

Cerebral ischemia in rats converts xanthine oxidase to a superoxide-producing form, suggesting its role in brain injury. This highlights the xanthine oxidase pathway

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Pathophysiology

Background:

  • Xanthine oxidase (XO) is implicated in free radical generation in ischemic organs.
  • The role of XO in the ischemic rat brain remains less understood.

Purpose of the Study:

  • To investigate xanthine oxidase activity and its isoforms in the rat brain during cerebral ischemia.
  • To determine the contribution of the xanthine oxidase pathway to ischemic brain injury.

Main Methods:

  • High-performance liquid chromatography with electrochemical detection was used to measure uric acid and quantify XO activity.
  • Global cerebral ischemia was induced in rats using a four-vessel occlusion model.
  • XO activity was assessed in control and ischemic conditions.

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Main Results:

  • In control rats, 92.4% of XO activity was the NAD-dependent dehydrogenase form, with only 7.6% as the oxygen-dependent oxidase form.
  • After 30 minutes of global ischemia, the oxidase form increased to 43.7%, while total XO activity remained unchanged.
  • Uric acid synthesis was confirmed in the rat brain.

Conclusions:

  • Cerebral ischemia induces a significant conversion of xanthine oxidase from its dehydrogenase to its oxidase form in the rat brain.
  • The shift towards the oxidase form suggests the generation of oxygen-derived free radicals via the XO pathway during ischemic brain injury.
  • This pathway is likely involved in the pathogenesis of ischemic brain damage.