Xanthine, a product of purine metabolism, is a congenital metabolic disorder in which a large amount of xanthine is present in the urine. It is thought to be caused by a lack of the enzyme (xanthine oxidase) that oxidizes xanthine to uric acid, or by increased excretion of xanthine in the kidneys. It sometimes causes xanthine stones. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
プリンの代謝産物であるキサンチンが尿中に多量に存在している状態で,先天性の代謝異常である。原因はキサンチンを酸化して尿酸にする酵素 (キサンチンオキシダーゼ) の欠如,または腎臓でのキサンチンの排出亢進によると考えられている。ときにキサンチン結石の原因になる。
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