Expression, Catalytic Activity, and Inducibility of Cytochrome P450 2E1 (CYP2E1) in the Rat Central Nervous System
Expression, Catalytic Activity, and Inducibility of Cytochrome P450 2E1 (CYP2E1) in the Rat Central Nervous System
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细胞色素 P450 2E1 (CYP2E1) 在大鼠中枢神经系统中的表达、催化活性和诱导能力
DOI:
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发表时间:
1996
影响因子:
4.7
通讯作者:
M. Ingelman
中科院分区:
文献类型:
--
作者:
N. Tindberg;M. Ingelman
Abstract: Cytochrome P450 2E1 (CYP2E1) metabolizes several neuroactive substrates, including exogenous compounds such as anesthetics, organic solvents, and muscle relaxants as well as endogenous substrates such as arachidonic acid. CYP2E1 and its mRNA were found to be expressed in the rat hippocampus, where the enzyme was localized mainly to the microsomal fraction. Chlorzoxazone (CZN), a CYP2E1 substrate, was 6‐hydroxylated in hippocampal homogenates with a Km of 25.5 µM and a Vmax of 0.22 pmol/mg/min. CYP2E1 was also expressed in vitro in cortical glial cultures, where CYP2E1 mRNA levels were found to be 1,000‐fold lower than in rat liver. Exposure of cortical glial cultures to 25 or 100 mM ethanol for 24 h caused a fourfold and sixfold increase, respectively, in the rate of CYP2E1‐dependent 6‐hydroxylation of CZN. After a continuous exposure to 100 mM ethanol for 48 or 72 h, however, the hydroxylation rate was down‐regulated. Chlormethiazole, a potent inhibitor of hepatic CYP2E1 transcription, inhibited the ethanol‐dependent induction of CYP2E1 by 50%. In vivo, acute ethanol treatment of rats (24 h, 3 g/kg) resulted in a 1.8‐fold increase in the rate of CZN 6‐hydroxylation in hippocampal homogenates. It is concluded that CYP2E1 is expressed and catalytically active in the rat CNS, and that CYP2E1 can be induced by a relatively low concentration of ethanol in cortical glial cultures. It is suggested that CYP2E1 substrates may be metabolically activated in situ in the CNS.
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DOI:
--
发表时间:
1987
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Sundin,M;Warner,M;Haaparanta,T;Gustafsson,JA
通讯作者:
Gustafsson,JA
DOI:
10.1177/39.8.1649855
发表时间:
1991
期刊:
The journal of histochemistry and cytochemistry : official journal of the Histochemistry Society
影响因子:
--
作者:
Cammer,W;Downing,M;Clarke,W;Schenkman,JB
通讯作者:
Schenkman,JB
DOI:
10.1006/bbrc.1993.1821
发表时间:
1993-07-15
影响因子:
3.1
作者:
ANANDATHEERTHAVARADA, HK;WILLIAMS, JF;WECKER, L
通讯作者:
WECKER, L
DOI:
--
发表时间:
1985
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Koop,DR;Casazza,JP
通讯作者:
Casazza,JP
DOI:
--
发表时间:
1995
期刊:
Drug metabolism and disposition: the biological fate of chemicals.
影响因子:
--
作者:
Yamazaki,H;Guo,Z;Guengerich,FP
通讯作者:
Guengerich,FP