近日,河北醫(yī)科大學藥學院石曉偉課題組遲玉乾老師,使用IPHASE品牌產(chǎn)品:大鼠肝微粒體在《International Journal of Biological Macromolecules》權·威期刊上發(fā)表文章《Metabolic activation and cytochrome P450 inhibition of piperlonguminine mediated by CYP3A4》,影響因子8.2!
本研究的主要目的是在體外鑒定PLG的反應性代謝物,并評估其抑制CYP450的能力。在暴露于PLG的大鼠和人肝微粒體孵育系統(tǒng)中,檢測到兩種氧化代謝物(M1和M2)。此外,在以n-乙酰半胱氨酸作為捕獲劑的微粒體中,發(fā)現(xiàn)了四種異構體o-醌衍生的反應性代謝物的n-乙酰半胱氨酸偶聯(lián)物(M3、M4、M5和M6)。代謝物的形成依賴于NADPH。抑制和重組CYP450酶孵育實驗表明,CYP3A4是負責PLG代謝激活的主要酶。本研究通過化學合成的方法對O-脫烷基化代謝物(M1)進行了表征。半抑制濃度移位實驗顯示,PLG對CYP3A4、2C9、2E1、2C8和2D6的抑制作用呈時間依賴性。本研究有助于理解PLG誘導的酶抑制和生物活化。
摘要
Piperlonguminine (PLG) is a major alkaloid found in Piper longum fruits. It has been shown to possess a variety of biological activities, including anti-tumor, anti-hyperlipidemic, anti-renal fibrosis and anti-inflammatory properties.Previous studies have reported that PLG inhibits various CYP450 enzymes. The main objective of this study was to identify reactive metabolites of PLG in vitro and assess its ability to inhibit CYP450. In rat and human liver microsomal incubation systems exposed to PLG, two oxidized metabolites (M1 and M2) were detected. Additionally, in microsomes where N-acetylcysteine was used as a trapping agent, N-acetylcysteine conjugates (M3, M4, M5 and M6) of four isomeric O-quinone-derived reactive metabolites were found. The formation of metabolites was dependent on NADPH. Inhibition and recombinant CYP450 enzyme incubation experiments showed that CYP3A4 was the primary enzyme responsible for the metabolic activation of PLG. This study characterized the O-dealkylated metabolite (M1) through chemical synthesis.The IC50 shift assay showed timedependent inhibition of CYP3A4, 2C9, 2E1, 2C8 and 2D6 by PLG. This research contributes to the understanding of PLG-induced enzyme inhibition and bioactivation.
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