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Related Experiment Videos

[Xanthine oxidase (xanthine dehydrogenase)]

S Sumi1, Y Wada

  • 1Department of Pediatrics, Nagoya City University Medical School.

Nihon Rinsho. Japanese Journal of Clinical Medicine
|December 1, 1996
PubMed
Summary

Xanthine oxidase, an enzyme involved in cellular metabolism, produces superoxide radicals during reperfusion, potentially causing tissue injury. Its inhibition by allopurinol may lead to severe toxicity with 6-mercaptopurine.

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Area of Science:

  • Biochemistry
  • Molecular Biology

Context:

  • Xanthine oxidase (XO), also known as xanthine dehydrogenase (XDH), is a key enzyme in purine metabolism.
  • The enzyme exists as a dimer, with each subunit approximately 150,000 daltons and containing four redox-active cofactors.
  • In vivo, it predominantly functions as the dehydrogenase form, which is NAD-dependent.

Purpose:

  • To detail the molecular characteristics of human xanthine oxidase.
  • To explore the role of xanthine oxidase in postischemic reperfusion injury.
  • To discuss the implications of xanthine oxidase inhibition on drug toxicity.

Summary:

  • Human liver xanthine oxidase cDNA has been cloned, and its amino acid sequence elucidated.
  • The enzyme's potential role in generating superoxide during postischemic reperfusion and its contribution to tissue damage are discussed.
  • The interaction between allopurinol, a xanthine oxidase inhibitor, and 6-mercaptopurine toxicity is highlighted.

Impact:

  • Provides foundational knowledge on xanthine oxidase structure and function.
  • Highlights the enzyme's pathological relevance in ischemia-reperfusion injury.
  • Informs clinical practice regarding potential drug interactions and toxicity management.

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