Oxidative metabolism of cannabidiol monomethyl ether (CBDM), one of the components of marihuana, was studied in the guinea pig. Cannabielsoin monomethyl ether (CBEM) was found to be formed with hepatic microsomes by gas chromatography-mass spectrometry (GC-MS). Experiments using various modifiers of enzymatic reaction suggested that, as in the case of cannabielsoin (CBE) formation from canabidiol (CBD), CBEM was formed from CBDM by the monooxygenase system including cytochrome P450. When cannabidiol dimethyl ether (CBDD), in which phenolic hydroxyl groups of CBD are masked with methyl groups, was incubated with liver microsomes and an reduced nicotinamide adenine dinucleotide phosphate-generating system, 1S, 2R-epoxy-CBDD was identified by GC-MS. The epoxy metabolite was also found in the liver of a guinea pig pretreated with CBDD (100mg/kg, intraperitoneally) 1h before sacrifice. Rate of 1S, 2R-epoxide metabolism was slower than that of 1R, 2S-epoxy-CBDD under the conditions, as in the microsomal oxidation of CBDD described above. These results indicate that 1S, 2R-epoxides are formed from CBD, CBDM and CBDD and that the epoxides are quickly converted to elsoin-type metabolites in the cases of CBD and CBDM.
研究了
大麻成分之一的CBD单
甲醚(CB
DM)在豚鼠中的氧化代谢。通过气相色谱-质谱联用技术(GC-MS),发现通过肝微粒体形成了
大麻醇单
甲醚(CB
EM)。使用各种酶促反应调节剂的实验表明,CB
EM的形成与
大麻二酚(CBD)转变为
大麻醇(CBE)类似,是通过包括细胞色素P450在内的单氧合酶系统从CB
DM生成的。当掩盖了CBD
酚羟基的甲基化合物CBD二
甲醚(C
BDD)与肝微粒体及还原型烟酰胺
腺嘌呤二核苷酸
磷酸(
NADPH)生成系统共同孵育时,通过GC-MS鉴定出1S, 2R-氧化C
BDD。该氧化代谢物也在接受C
BDD(100mg/kg,腹腔注射)预处理1小时后被处死的豚鼠肝脏中被发现。在上述条件下,1S, 2R-氧化物的代谢速率低于1R, 2S-氧化C
BDD。这些结果表明,1S, 2R-氧化物是从CBD、CB
DM和C
BDD生成的,并且在CBD和CB
DM的情况下,这些氧化物迅速转化为
大麻醇类代谢物。