Hydrolytic Metabolism of Withangulatin A Mediated by Serum Albumin Instead of Common Esterases in Plasma.

IF 1.9 4区 医学 Q3 PHARMACOLOGY & PHARMACY European Journal of Drug Metabolism and Pharmacokinetics Pub Date : 2023-07-01 DOI:10.1007/s13318-023-00834-8
Yu Zhuang, Yuxiao Wang, Ning Li, Haitao Meng, Zhiyu Li, Jianguang Luo, Zhixia Qiu
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引用次数: 1

Abstract

Background and objectives: The oral bioavailability of withangulatin A (WA) is low and may undergo first-pass metabolism because of the presence of two esters bonds. This study aimed to identify the hydrolysis behavior and mechanism of WA, thus enriching its structure-pharmacokinetic relationship.

Methods: The in vivo pharmacokinetic studies of WA in rats were first investigated, followed by in vitro assays including metabolic stability, phenotyping identification and metabolic kinetics assays. After screening out the responsible enzymes with higher catalytic capacity, molecular docking study was performed to demonstrate the interaction mode between WA and metabolic enzymes. Then, metabolites in human serum albumin (HSA) were identified by LC-TOF-MS/MS.

Results: In rats, the oral bioavailability of WA was only 2.83%. In vitro, WA was hydrolyzed in both rat and human plasma and could not be inhibited by selective esterase inhibitors. Physiologic concentration of HSA not recombinant human carboxylesterases (rhCES) could significantly hydrolyze WA, and it had a similar hydrolytic capacity with human plasma to WA. Furthermore, WA could stably bind to HSA by forming hydrogen bonds with Lys199 and Arg410, accompanied by the metabolic reaction of the lactone ring opening.

Conclusion: The study showed that WA underwent obvious hydrolysis in rat and human plasma, which implied a strong first-pass effect. Serum albumin rather than common esterases primarily contributed to the hydrolytic metabolism of WA in plasma.

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血浆白蛋白代替普通酯酶介导的Withangulatin A的水解代谢。
背景和目的:withangulatin A (WA)的口服生物利用度较低,由于存在两个酯键,可能经历首次代谢。本研究旨在确定WA的水解行为和水解机制,从而丰富其结构-药动学关系。方法:首先进行大鼠体内药代动力学研究,然后进行体外代谢稳定性、表型鉴定和代谢动力学分析。筛选出催化能力较高的相关酶后,进行分子对接研究,验证WA与代谢酶的相互作用模式。采用LC-TOF-MS/MS对人血清白蛋白(HSA)代谢产物进行鉴定。结果:WA在大鼠体内的口服生物利用度仅为2.83%。在体外,WA在大鼠和人血浆中均可水解,且不受选择性酯酶抑制剂的抑制。非重组人羧酸酯酶(rhCES)生理浓度的HSA能显著水解WA,且与人血浆水解WA的能力相似。此外,WA可以与Lys199和Arg410形成氢键与HSA稳定结合,并伴有内酯环打开的代谢反应。结论:研究表明,WA在大鼠和人血浆中均发生了明显的水解,具有较强的首过效应。血清白蛋白而非普通酯酶主要参与血浆中WA的水解代谢。
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来源期刊
CiteScore
3.70
自引率
0.00%
发文量
64
审稿时长
>12 weeks
期刊介绍: Hepatology International is a peer-reviewed journal featuring articles written by clinicians, clinical researchers and basic scientists is dedicated to research and patient care issues in hepatology. This journal focuses mainly on new and emerging diagnostic and treatment options, protocols and molecular and cellular basis of disease pathogenesis, new technologies, in liver and biliary sciences. Hepatology International publishes original research articles related to clinical care and basic research; review articles; consensus guidelines for diagnosis and treatment; invited editorials, and controversies in contemporary issues. The journal does not publish case reports.
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