生物活性方面,去甲阿米替林(Desmethylnortriptyline)是文拉法辛(Nortriptyline)的代谢产物。文拉法辛是一种三环类抗抑郁药,主要活性代谢物为阿米替林(Amitriptyline),用于缓解抑郁症症状。
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
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 |
—— | 3-(10,11-dihydro-5H-dibenzo[a,d][7]annulen-5-ylidene)propanenitrile | 40443-02-5 | C18H15N | 245.324 |
—— | 5-Ethyliden-10,11-dihydro-5H-dibenzocycloheptan | 28860-39-1 | C17H16 | 220.314 |
—— | 2-(10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-ylidene)ethyl bromide | 13099-16-6 | C17H15Br | 299.21 |
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
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 |
—— | amitriptyline-methanol | —— | C21H25NO | 307.436 |
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.