[Microanalysis of tryptophan metabolites].

Abstract

In tryptophan metabolites, 3-hydroxykynurenine and 3-hydroxyanthranilic acid have been reported to show a carcinogenic action to mice bladder and the relation of the metabolites to human bladder cancer has been discussed. We developed methods for the fluorometric assay of these compounds and showed that the excretion of 3-hydroxyanthranilic acid increased in the patients with bladder cancer. We also devised methods for the fluorometric assay of glucuronide and sulfate of 3-hydroxyanthranilic acid and showed that the minor excretion of these conjugated forms was shown in humans. The distribution of these compounds was also studied and the obtained data suggests that 3-hydroxykynurenine has affinity for the pancreas. We then developed methods for the determination of other metabolites of tryptophan. A fluorescence reaction with UV irradiation was found and applied to the determination. This method is the most sensitive to kynurenic acid but can be applied to kynurenine, nicotinamide and quinolinic acid. Furthermore, this methods also applied to the determination of some medicines, e.g. indomethacin, isoniazid, nalidixic acid, nicorandil and disodium cromoglicate in the serum or urine. We further devised other methods for the determination of xanthurenic acid and 5-hydroxyindoles.

• Authors: M Watanabe
• Journal: Yakugaku zasshi : Journal of the Pharmaceutical Society of Japan (Yakugaku Zasshi) Vol. 117 Issue 10-11 Pg. 657-64 (Nov 1997) ISSN: 0031-6903 [Print] Japan
• PMID: 9414579 (Publication Type: Journal Article, Review)

Chemical References

• 3-Hydroxyanthranilic Acid
• 3-hydroxykynurenine
• Kynurenine
• Tryptophan
• Kynurenic Acid

Topics

• 3-Hydroxyanthranilic Acid (analysis)
• Animals
• Fluorometry (methods)
• Humans
• Kynurenic Acid (analysis)
• Kynurenine (analogs & derivatives, analysis)
• Mice
• Microchemistry (methods)
• Tryptophan (metabolism)
• Ultraviolet Rays
• Urinary Bladder Neoplasms (metabolism)