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Published on: March 15, 2017
Microsomal hydroxylation and glucuronidation of [6]-gingerol
Erika Pfeiffer1, Franziska F Heuschmid, Stefan Kranz
1Institute of Applied Biosciences, Chair of Food Chemistry, University of Karlsruhe, P.O. Box 6980, D-76128 Karlsruhe, Germany.
[6]-Gingerol, a key compound in ginger, undergoes complex metabolism in the body. Understanding these metabolic pathways is crucial for its diverse biological activities.
Area of Science:
- Pharmacology
- Biochemistry
- Natural Products Chemistry
Background:
- [6]-Gingerol is the primary pungent compound in ginger, commonly consumed via condiments and supplements.
- Its biological activities are linked to its chemical structure and how the body processes it.
Purpose of the Study:
- To elucidate the metabolic pathways of [6]-gingerol in mammalian systems.
- To identify metabolites formed by hepatic and intestinal microsomes and characterize glucuronidation by specific human UDP-glucuronosyltransferase (UGT) enzymes.
Main Methods:
- Incubation of [6]-gingerol with NADPH-fortified rat hepatic microsomes followed by Gas Chromatography-Mass Spectrometry (GC-MS) analysis.
- Incubation with UDP-glucuronic acid (UDPGA)-fortified rat and human hepatic microsomes, and human intestinal microsomes, analyzed by Liquid Chromatography-Mass Spectrometry/Mass Spectrometry (LC-MS/MS).
- Assays using Supersomes containing specific human UGT enzymes (UGT1A1, 1A3, 1A9, 2B7).
Main Results:
- Rat hepatic microsomes produced eight metabolites, including aromatic and aliphatic hydroxylation products and [6]-gingerdiol diastereomers.
- Glucuronidation occurred predominantly at the phenolic hydroxyl group, with minor aliphatic glucuronidation observed in rat and human hepatic microsomes.
- Human intestinal microsomes exclusively formed the phenolic glucuronide.
- Specific UGT enzymes showed distinct activities: UGT1A9 favored alcoholic glucuronidation, while UGT2B7 predominantly formed the phenolic glucuronide.
Conclusions:
- [6]-Gingerol exhibits complex metabolic transformations involving hydroxylation and glucuronidation.
- Differential activity of UGT enzymes contributes to varied metabolic profiles.
- The identified metabolic pathways are important considerations for the pharmacological effects and therapeutic applications of [6]-gingerol.
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