Oxidative metabolism of curcumin-glucuronide by peroxidases and isolated human leukocytes
| Autor: | Odaine N. Gordon, Fumie Nakashima, Akil I. Joseph, Takahiro Shibata, Koji Uchida, Claus Schneider, Paula B. Luis |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
Curcumin Proton Magnetic Resonance Spectroscopy Biochemistry Mass Spectrometry Article 03 medical and health sciences chemistry.chemical_compound Glucuronides Humans Xanthine oxidase Cells Cultured Chromatography High Pressure Liquid Pharmacology biology Lactoperoxidase Glucuronic acid Metabolic pathway 030104 developmental biology Peroxidases chemistry Myeloperoxidase biology.protein Sodium azide Glucuronide Oxidation-Reduction |
| Zdroj: | Biochemical Pharmacology. 132:143-149 |
| ISSN: | 0006-2952 |
| DOI: | 10.1016/j.bcp.2017.03.002 |
| Popis: | Conjugation with glucuronic acid is a prevalent metabolic pathway of orally administrated curcumin, the bioactive diphenol of the spice turmeric. The major in vitro degradation reaction of curcumin is autoxidative transformation resulting in oxygenation and cyclization of the heptadienedione chain to form cyclopentadione derivatives. Here we show that curcumin-glucuronide is much more stable than curcumin, degrading about two orders of magnitude slower. Horseradish peroxidase-catalyzed oxidation of curcumin-glucuronide occurred at about 80% of the rate with curcumin, achieving efficient transformation. Using LC-MS and NMR analyses the major products of oxidative transformation were identified as glucuronidated bicyclopentadione diastereomers. Cleavage into vanillin-glucuronide accounted for about 10% of the products. Myeloperoxidase and lactoperoxidase oxidized curcumin-glucuronide whereas tyrosinase and xanthine oxidase were not active. Phorbol ester-activated primary human leukocytes showed increased oxidative transformation of curcumin-glucuronide which was inhibited by the peroxidase inhibitor sodium azide. These studies provide evidence that the glucuronide of curcumin is not an inert product and may undergo further enzymatic and non-enzymatic metabolism. Oxidative transformation by leukocyte myeloperoxidase may represent a novel metabolic pathway of curcumin and its glucuronide conjugate. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect