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Xenobiotica
the fate of foreign compounds in biological systems
Volume 41, 2011 - Issue 7
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General Xenobiochemistry

Intestinal transport of scutellarein and scutellarin and first-pass metabolism by UDP-glucuronosyltransferase-mediated glucuronidation of scutellarein and hydrolysis of scutellarin

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Pages 538-548 | Received 17 Feb 2011, Accepted 04 Apr 2011, Published online: 11 May 2011
 

Abstract

  1. Scutellarin (SG) is a bioactive flavonoid used to treat cardiovascular disease. Scutellarein (S) is the aglycone form of SG. This study aimed to characterize their intestinal transport and first-pass metabolism by UDP-glucuronosyltransferase-mediated glucuronidation and β-glucuronidase-mediated hydrolysis.

  2. Results showed that S is more readily passed through Caco-2 cell monolayers by passive diffusion than SG. SG was the predominant metabolite of S, which was formed during the transportation of S across Caco-2 cell monolayers or following incubation of S with human microsomes. SG was extensively generated in human liver microsomes (HLMs), which was demonstrated by its higher catalyzing efficiency (Clint) in liver microsomes than in human intestinal microsomes (HIMs).

  3. Enzymatic kinetic analysis indicated that the catalyzing efficiency of UGT1A9 was the highest among the tested UGTs under the present experimental conditions, followed by UGT1A1 and UGT1A3. No significant P450-mediated hydroxylation of S was found. SG may be hydrolyzed into S in both HLMs and HIMs.

Acknowledgements

Authors would like to thank Ms. Li Yan and Mr. Wu Wenjin for their help on the experiments with UGT1A10.

Declaration of interest

This project was supported by the Macau Science and Technology Development Fund (008/2007/A1).

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