In vivo and in vitro metabolism of cannabidiol monomethyl ether and cannabidiol dimethyl ether in the guinea pig: On the formation mechanism of cannabielsoin-type metabolite from cannabidiol.
作者:Hiroshi GOHDA、Shizuo NARIMATSU、Ikuo YAMAMOTO、Hidetoshi YOSHIMURA
DOI:10.1248/cpb.38.1697
日期:——
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(CBDM)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(CBEM)。使用各种酶促反应调节剂的实验表明,CBEM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CBDM生成的。当掩盖了CBD酚羟基的甲基化合物CBD二甲醚(CBDD)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CBDD。该氧化代谢物也在接受CBDD(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CBDD。这些结果表明,1S, 2R-氧化物是从CBD、CBDM和CBDD生成的,并且在CBD和CBDM的情况下,这些氧化物迅速转化为大麻醇类代谢物。