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题名: Identification of the UDP-Glucuronosyltransferase Isozyme Involved in Senecionine Glucuronidation in Human Liver Microsomes
作者: He, Yu-Qi1;  Liu, Yong2;  Zhang, Bin-Feng1;  Liu, Hui-Xin2;  Lu, Yan-Liu3;  Yang, Li1;  Xiong, Ai-zhen1;  Xu, Ling-Ling1;  Wang, Chang-Hong1;  Yang, Ling2;  Wang, Zheng-Tao1
通讯作者: Wang ZT
刊名: DRUG METABOLISM AND DISPOSITION
发表日期: 2010-04-01
DOI: 10.1124/dmd.109.030460
卷: 38, 期:4, 页:626-634
收录类别: SCI
文章类型: Article
部门归属: 18
项目归属: 1806
产权排名: 2;2
WOS标题词: Science & Technology ;  Life Sciences & Biomedicine
类目[WOS]: Pharmacology & Pharmacy
研究领域[WOS]: Pharmacology & Pharmacy
英文摘要: Senecionine (SEN) is a representative of the hepatotoxic pyrrolizidine alkaloids. Although phase I metabolism for cytochrome P450-mediated metabolic activation of SEN was investigated extensively, phase II metabolism for glucuronidation of this compound has not been investigated until now. In our present study, one unique glucuronidation product of SEN in human liver microsomes (HLMs) was identified as SEN N-glucuronide using an authentically synthesized product for which the structure was identified via (1)H and (13)C NMR analysis. Subsequently, kinetics indicated that SEN N-glucuronidation followed the typical Michaelis-Menten model and only one major isozyme participated in it. Finally, this isozyme was demonstrated to be UDP-glucuronosyltransferase (UGT) 1A4, with the direct evidence that recombinant UGT1A4 exhibited predominant and exclusive activity on SEN N-glucuronidation. This result was confirmed by other experiments including chemical inhibition by selective inhibitors and a correlation study between activities of SEN N-glucuronidation and various UGT isozymes. The exclusive role of UGT1A4 on SEN N-glucuronidation was strengthened additionally by its inhibitory kinetic study in which the selective inhibitor of UGT1A4 showed a similar inhibition pattern and K(i) values in both HLM and recombinant UGT1A4 systems. Because UGT2B10 activity failed to correlate with SEN N-glucuronidation in HLMs from 10 individuals, it was impossible for UGT2B10 to play an important role in this metabolism.
关键词[WOS]: PYRROLIZIDINE ALKALOIDS ;  IN-VITRO ;  METABOLIC-ACTIVATION ;  SPECIES-DIFFERENCES ;  N-GLUCURONIDATION ;  MEDICINAL-PLANTS ;  UGT2B10 ;  RAT ;  BILIRUBIN ;  NICOTINE
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000275670000011
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/103385
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Shanghai Univ Tradit Chinese Med, Inst Chinese Mat Med, MOE Key Lab Standardizat Chinese Med, Shanghai 201203, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian, Peoples R China
3.Shanghai Univ Tradit Chinese Med, Affiliated Longhua Hosp, Shanghai, Peoples R China

Recommended Citation:
He, Yu-Qi,Liu, Yong,Zhang, Bin-Feng,et al. Identification of the UDP-Glucuronosyltransferase Isozyme Involved in Senecionine Glucuronidation in Human Liver Microsomes[J]. DRUG METABOLISM AND DISPOSITION,2010,38(4):626-634.
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