Diazepam metabolism by rat and human liver in vitro: inhibition by mephenytoin.

Diazepam metabolism by rat and human liver in vitro: inhibition by mephenytoin.
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大鼠和人肝脏体外地西泮代谢:美芬妥英的抑制。

DOI:
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发表时间:
1992
期刊:
Xenobiotica; the fate of foreign compounds in biological systems
影响因子:
--
通讯作者:
T. Inaba
T. Inaba
中科院分区:
--
文献类型:
--
作者:
T. V. Beischlag;W. Kalow;W. Mahon;T. Inaba

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1. 使用人和大鼠肝脏在体外研究了地西泮代谢及其与美芬妥英羟化酶的关联。 2. 获得了大鼠肝脏组分中地西泮 (DZP) 形成对羟基地西泮 (p-羟基-DZP)、N-去甲基地西泮 (NDZ) 和替马西泮 (TMZ) 的酶动力学参数。大鼠中对羟基-DZP、NDZ 和 TMZ 形成的 Km 值分别为 14 +/- 3 (SEM) microM、44 +/- 4 和 63 +/- 8;根据Vmax/Km计算的清除率值分别为5.7、3.2和4.9ml/g/分钟。 3.美芬妥英(MP)在大鼠肝脏中竞争性抑制NDZ的形成,但不抑制对羟基-DZP或TMZ的形成;在人肝脏中,MP 不会抑制 NDZ 和 TMZ 的形成。 4. 在七个不同的人类肝脏中,与 NDZ 和 TMZ 的形成相比,对羟基-DZP 的形成代表次要途径。
1. Diazepam metabolism and its association with mephenytoin hydroxylase were studied in vitro using human and rat livers. 2. Enzyme kinetic parameters were obtained for the formation of p-hydroxydiazepam (p-hydroxy-DZP), N-desmethyldiazepam (NDZ), and temazepam (TMZ) from diazepam (DZP) in rat liver fractions. The Km values for formation in rat of p-hydroxy-DZP, NDZ and TMZ were 14 +/- 3 (SEM) microM, 44 +/- 4 and 63 +/- 8, respectively; clearance values calculated from Vmax/Km were 5.7, 3.2 and 4.9 ml/g per min, respectively. 3. Mephenytoin (MP) competitively inhibited, in rat liver, the formation of NDZ, but not the formation of p-hydroxy-DZP or TMZ; in human liver neither NDZ nor TMZ formation was inhibited by MP. 4. In seven different human livers the formation of p-hydroxy-DZP represented a minor pathway compared to the formation of NDZ and TMZ.
DOI: --
发表时间: 1986-01
期刊: The Journal of biological chemistry
影响因子: --
作者:
T. Shimada;K. Misono;F. Guengerich
通讯作者: T. Shimada;K. Misono;F. Guengerich
DOI: --
发表时间: 1987-03
期刊: Drug metabolism and disposition: the biological fate of chemicals
影响因子: --
作者:
M. Campbell;D. Grant;T. Inaba;W. Kalow
通讯作者: M. Campbell;D. Grant;T. Inaba;W. Kalow