Formation Pathways of γ-Butyrolactone from the Furan Ring of Tegafur during Its Conversion to 5-Fluorouracil
作者:Ikuo Yamamiya、Kunihiro Yoshisue、Eiji Matsushima、Sekio Nagayama
DOI:10.1124/dmd.110.032797
日期:2010.8
procedures and clarified the metabolic pathway of FT to GBL/GHB. Succinaldehyde (SA) and 4-hydroxybutanal (4-OH-BTL) were produced as the metabolites because of the cleavage of the furan ring of FT during its conversion to 5-FU in cDNA-expressed CYP2A6 and purified TPase, respectively; however, GBL/GHB was hardly detected in cDNA-expressed CYP2A6 and purified TPase. GBL/GHB was formed after human hepatic
Tegafur(FT)是一种5-氟尿嘧啶(5-FU)前药,已在临床上用于各种癌症化学疗法。在患者中鉴定出以下FT代谢物:5-FU,氟-β-丙氨酸和γ-丁内酯(GBL)及其酸性形式,γ-羟基丁酸酯(GHB)。GBL / GHB可能是从FT的呋喃环生成的,它抑制肿瘤细胞的血管生成,有助于FT疗法的抗肿瘤作用。在本研究中,我们使用2,4-二硝基苯肼肼衍生化方法鉴定了CYP2A6和胸苷磷酸化酶(TPase)由FT的呋喃环形成的代谢物,并阐明了FT转化为GBL / GHB的代谢途径。产生琥珀醛(SA)和4-羟基丁醛(4-OH-BTL)的代谢产物是因为FT的呋喃环在cDNA表达的CYP2A6和纯化的TPase中分别转化为5-FU时被裂解。然而,在表达cDNA的CYP2A6和纯化的TPase中几乎未检测到GBL / GHB。将人肝微粒体或与细胞溶质混合的cDNA表达的CYP2A6与FT孵育后,形成GBL