代谢
在大鼠代谢研究中,韩威斯特大鼠接受了一次口服给药,剂量为10和1000毫克/千克的(吲哚-(14)C)或(三唑-(14)C)氨磺溴(放射性纯度>或=95.2%),载体为水中的0.5%甲基纤维素。随后进行了一系列实验(每个剂量组4只/性别),评估每个剂量水平在给药后最多120小时内的放射性排泄和组织分布,并确定了血浆和全血的动力学。此外,还进行了一项实验,研究在单次口服给药10或1000毫克/千克的(吲哚-(14)C)NC-224后,从胆管插管的大鼠中排泄放射性物质。为了检查放射性物质在组织中的分布随时间的变化,大鼠还接受了10或1000毫克/千克的(吲哚-(14)C)氨磺溴的给药,然后在给药后2和24小时(10毫克/千克)或12和72小时(1000毫克/千克)处死了每个时间点的3只/性别的大鼠。对这些实验的排泄物和组织/器官样本进行了放射性分析,并对粪便、尿液、胆汁、肝脏和血浆的选定混合样本进行了分析,以确定代谢轮廓。...在两个性别的粪便中,母化合物是主要的(14)C残留物,占给药剂量的40-52%(10毫克/千克)和83-89%(1000毫克/千克)。从粪便、尿液和胆汁中分离出的其他组分/代谢物,每个组分占给药剂量的<5%,除了从低剂量大鼠胆汁中分离出的一个组分,占给药剂量的5.3%。这个组分暂时被识别为Metabolite IT-2的一种未特指的共轭物。除了母化合物外,尿液中还鉴定出了九种初级代谢物和一种代谢物的一种葡萄糖苷酸共轭物。其中两种代谢物(IT-4和IT-5)也被确定为肝脏(每个占肝脏总放射性残留物的12-20%;TRR in liver)和血浆(每个占血液中TRR的14-56%)在Tmax时的主要(14)C残留物。根据代谢轮廓,大鼠对氨磺溴的代谢涉及一系列反应,包括三唑环上磺酰氨基侧链的断裂,脱溴,氧化/羟基化,吲哚和三唑基团之间的磺酰桥有限的断裂,吲哚环的开启,以及初级代谢物的共轭。氨磺溴在大鼠中的主要代谢途径似乎涉及初始断裂磺酰氨基侧链以形成IT-4,随后羟基化为IT-5,然后这些初级代谢物进一步降解或共轭。
In a rat metabolism study, Han Wistar rats were treated with a single gavage dose of (indole- (14) C) or (triazole- (14)C) amisulbrom (radiochemical purity > or = 95.2%) at 10 and 1000 mg/kg in aqueous 0.5% methy1cellulose. A series of experiments were then performed (4/sex/dose group) evaluating the excretion and tissue distribution of radioactivity at each dose level at up to 120 hours post-dose, and plasma and whole blood kinetics were determined. An additional experiment was conducted examining the excretion of radioactivity from bile duct-cannulated rats following a single oral dose of (indole-(14)C) NC-224 at 10 or 1000 mg/kg. To examine the distribution of radioactivity in tissues over time, rats were also dosed with (indole- (14) C) amisulbrom at 10 or 1000 mg/kg and 3 rats/sex/time point were then sacrificed at 2 and 24 hours post-dose (10 mg/kg) or 12 and 72 hours post-dose (1000 mg/kg). Excreta and tissue/organ samples from these experiments were radioassayed, and selected pooled samples of feces, urine, bile, liver, and plasma were analyzed to determine the metabolic profile. ... Parent compound was the major (14)C-residue identified in feces of both sexes and (14)C-labels, accounting for 40-52% of the administered dose at 10 mg/kg and 83-89% at 1000 mg/kg. Other components/metabolites isolated from feces, urine and bile each accounted for <5% of the administered dose, with the exception of one component isolated from the bile of the low-dose rats that accounted for 5.3% of the administered dose. This component was tentatively identified as an unspecified conjugate of Metabolite IT-2. In addition to parent, nine primary metabolites and a glucuronide conjugate of one metabolite were identified in urine, feces and/or bile. Two of these metabolites (IT-4 and IT-5) were also identified as being the major (14)C-residues in liver (each 12-20% of the total radioactive residues; TRR in liver) and plasma (each 14-56% of the TRR in blood) at Tmax. Based on the metabolic profile, the metabolism of amisulbrom in the rat involves a series of reactions including cleavage of the sulfonyl amino side chain on the triazole ring, debromination, oxidation/hydroxylation, limited cleavage of the sulfonyl bridge between the indole and triazole moieties, indole ring opening, and conjugation of primary metabolites. The major route of metabolism of amisulbrom in rats appears to involve the initial cleavage of the sulfonylamino side to form IT-4 and it subsequent hydroxylation to IT-5, followed by further degradation or conjugation of these primary metabolites.
来源:Hazardous Substances Data Bank (HSDB)