(E)-10-羟氮卓特林 ((E)-10-OH-NT) 是诺 tripletline (HY-B1417) 的代谢产物。而诺 tripletline 是一种三环类抗抑郁药,其主要活性代谢物为氨 tripletline (HY-B0527A)。
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | (+)-(E)-10-Hydroxy-Amitriptyline | 129312-49-8 | C20H23NO | 293.409 |
—— | (+)-E-5-(γ-bromopropylidene)-10,11-dihydro-10-hydroxy-5H-dibenzo[a,d]-cycloheptene | 156458-95-6 | C18H17BrO | 329.236 |
去甲替林 | 3-(10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-ylidene)-N-methyl-1-propanamine | 72-69-5 | C19H21N | 263.382 |
阿米替林 | Amitriptyline | 50-48-6 | C20H23N | 277.409 |
—— | (E)-5-(γ-bromopropylidene)-10,11-dihydro-10-oxo-5H-dibenzocycloheptene | 156458-94-5 | C18H15BrO | 327.22 |
Kinetic analysis of the metabolism of amitriptyline and nortriptyline using liver microsomes from Wistar rats showed that more than one enzyme was involved in each reaction except for monophasic amitriptyline N-demethylation. The Vmax values particularly in the high-affinity sites for E-10-hydroxylation of both drugs were larger than those for Z-10-hydroxylations. Their E- and Z-10-hydroxylase activities in Dark-Agouti rats, which are deficient for CYP2D1, were significantly lower than those in Wistar rats at a lower substrate concentration (5 μM). The strain difference was reduced at a higher substrate concentration (500 μM). A similar but a smaller strain difference was also observed in nortriptyline N-demethylase activity, and a pronounced sex difference (male > female) was observed in N-demethylation of both drugs in Wistar and Dark-Agouti rats. The reactions with the strain difference were inhibited concentration-dependently by sparteine, a substrate of the CYP2D subfamily, and an antibody against a CYP2D isoenzyme. The profiles of these decreased metabolic activities corresponded to that of the lower metabolic activities in Dark-Agouti rats.
These results indicated that a cytochrome P450 isozyme in the CYP2D subfamily was involved in E- and Z- 10-hydroxylations of amitriptyline and nortriptyline in rat liver microsomes as a major isozyme in a low substrate concentration range. It seems likely that the CYP2D enzyme contributes to nortriptyline N-demethylation.