代谢
体外研究中,比较了洛非普拉明(lofepramine)与依米帕明(imipramine)的代谢情况。两种化合物在大鼠和人体肝脏微粒体中通过NADPH生成系统被羟基化和去甲基化。两种药物共有的三种代谢物分别是去甲丙咪嗪(DMI)、2-羟基去甲丙咪嗪(2-OH-DMI)和二去甲基依米帕明(DDMI)。洛非普拉明还代谢为三种独特的三环代谢物。与真实参考化合物的比较表明,其中两种代谢物是2-羟基洛非普拉明和去甲基洛非普拉明。DDMI与DMI的浓度比值在洛非普拉明中高于依米帕明。这可能是由于洛非普拉明通过两条平行代谢途径形成DDMI,即DMI和去甲基洛非普拉明。推测洛非普拉明与去甲丙咪嗪和依米帕明不同的代谢模式对药物的治疗特性具有重要意义。
The in vitro metabolism of lofepramine was studied in comparison with imipramine. Both compounds were hydroxylated and demethylated by a NADPH-generating system in rat and human liver microsomes. Three metabolites were in common for the two drugs, namely desipramine (DMI), 2-hydroxydesipramine (2-OH-DMI) and didesmethylimipramine (DDMI). Lofepramine was also metabolized to three unique tricyclic metabolites. Comparisons with authentic reference compounds suggested that two of these metabolites were 2-hydroxylofepramine and desmethyllofepramine. The ratio between the concentrations of DDMI and DMI was higher for lofepramine than imipramine. This is probably due to DDMI formation via two parallel metabolic pathways of lofepramine, i.e. DMI and desmethyllofepramine, respectively. It is speculated that the different metabolic pattern of lofepramine as compared with desipramine and imipramine is of importance for the therapeutic profile of the drug.
来源:Hazardous Substances Data Bank (HSDB)