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Pharmacokinetic alterations of rhubarb anthraquinones in experimental colitis induced by dextran sulfate sodium in the rat
Wu, Wen-Jin; Yan, Ru; Li, Ting; Li, Ya-Ping; Zhou, Rui-Na; Wang, Yi-Tao
2017-02-23
Source PublicationJOURNAL OF ETHNOPHARMACOLOGY
ISSN0378-8741
Volume198Pages:600-607
Abstract

Ethnopharmacological relevance

Rhubarb (Rhei Rhizoma et Radix) is used for the treatment of digestive diseases in traditional medicinal practice in China. Recent studies also support its beneficial activities in alleviating ulcerative colitis (UC).

Aim of the study

This study aimed to characterize the oral pharmacokinetics of rhubarb anthraquinones, the main bioactive components of this herb, in the experimental chronic colitis rat model induced by dextran sulfate sodium (DSS) and to identify the factors causing the pharmacokinetic alterations.

Materials and methods

Rats received drinking water (normal group) or 5% DSS for the first 7 days and 3% DSS for additional 14 days (UC group). On day 21 both groups received an oral dose of the rhubarb extract (equivalent to 5.0 g crude drug/kg body weight). Plasma anthraquinone aglyconeslevels were determined directly by an LC-MS/MS method and the total of each anthraquinone (aglycone+conjugates) was quantified after β-glucuronidases hydrolysis.

Results

Rhubarb anthraquinones predominantly existed as conjugates in plasma samples from both groups and only free aloe-emodinrhein and emodin were detected. Compared to the normal rats, both Cmax and AUC of the three free anthraquinones were increased, while the systemic exposure (AUC) of the total (aglycone+conjugates) of most anthraquinones decreased by UC accompanied by the disappearance of multiple-peak phenomenon in the plasma concentration-time profiles. Gut bacteria from UC rats exhibited a decreased activity in hydrolyzing anthraquinone glycosides to form respective aglycone and there were significant decreases in microbial β-glucosidases and β-glucuronidases activities. Moreover, the intestinal microsomes from UC rats catalyzed glucuronidation of free anthraquinones with higher activities, while the activities of hepatic microsomes were comparable to normal rats.

Conclusions

The decreases of β-glucuronidases activity in DSS-induced chronic rat colitis should mainly account for the decreases in systemic exposure and abrogation of enterohepatic recirculation of most rhubarb anthraquinones after oral intake.

DOIhttp://doi.org/10.1016/j.jep.2017.01.049
URLView the original
Indexed BySCI
Language英语
WOS Research AreaPlant Sciences ; Pharmacology & Pharmacy ; Integrative & Complementary Medicine
WOS SubjectPlant Sciences ; Chemistry, Medicinal ; Integrative & Complementary Medicine ; Pharmacology & Pharmacy
WOS IDWOS:000397363100056
PublisherELSEVIER IRELAND LTD
The Source to ArticleWOS
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Cited Times [WOS]:9   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionInstitute of Chinese Medical Sciences
AffiliationState Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macao, China
First Author AffilicationInstitute of Chinese Medical Sciences
Recommended Citation
GB/T 7714
Wu, Wen-Jin,Yan, Ru,Li, Ting,et al. Pharmacokinetic alterations of rhubarb anthraquinones in experimental colitis induced by dextran sulfate sodium in the rat[J]. JOURNAL OF ETHNOPHARMACOLOGY,2017,198:600-607.
APA Wu, Wen-Jin,Yan, Ru,Li, Ting,Li, Ya-Ping,Zhou, Rui-Na,&Wang, Yi-Tao.(2017).Pharmacokinetic alterations of rhubarb anthraquinones in experimental colitis induced by dextran sulfate sodium in the rat.JOURNAL OF ETHNOPHARMACOLOGY,198,600-607.
MLA Wu, Wen-Jin,et al."Pharmacokinetic alterations of rhubarb anthraquinones in experimental colitis induced by dextran sulfate sodium in the rat".JOURNAL OF ETHNOPHARMACOLOGY 198(2017):600-607.
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