作者:Yumina Kitagawara、Tomoyuki Ohe、Kumiko Tachibana、Kyoko Takahashi、Shigeo Nakamura、Tadahiko Mashino
DOI:10.1124/dmd.115.065037
日期:2015.9
Benzbromarone (BBR) is a hepatotoxic drug, but the detailed mechanism of its toxicity remains unknown. We identified 2,6-dibromohydroquinone (DBH) and mono-debrominated catechol (2-ethyl-3-(3-bromo-4,5-dihydroxybenzoyl)benzofuran; CAT) as novel metabolites of BBR in rat and human liver microsomal systems by comparison with chemically synthesized authentic compounds, and we also elucidated that DBH is formed by cytochrome P450 2C9 and that CAT is formed mainly by CYP1A1, 2D6, 2E1, and 3A4. Furthermore, CAT, DBH, and the oxidized form of DBH are highly cytotoxic in HepG2 compared with BBR. Taken together, our data demonstrate that DBH, a novel reactive metabolite, may be relevant to BBR-induced hepatotoxicity.
苯溴马隆(BBR)是一种具有肝毒性的药物,但其毒性的详细机制仍不清楚。我们通过与化学合成的标准化合物对比,在鼠和人肝微粒体系统中鉴定出两种新的BBR代谢产物:2,6-二溴氢醌(DBH)和单脱溴儿茶酚(2-乙基-3-(3-溴-4,5-二羟基苯甲酰)苯并呋喃;CAT)。我们还阐明了DBH是由细胞色素P450 2C9形成的,而CAT主要由CYP1A1、2D6、2E1和3A4形成。此外,在HepG2细胞中,CAT、DBH以及DBH的氧化形式都比BBR具有更高的细胞毒性。综上所述,我们的数据表明,新型活性代谢物DBH可能与BBR诱导的肝毒性有关。