Cited by 46Pharmacogenetics and Drug MetabolismDrug-Induced Hepatotoxicity and ProtectionAlcohol Consumption and Health Effects

Expression of constitutive and inducible cytochrome P450 2E1 in rat brain

Yadav, Sanjay, Dhawan, Alok, Singh, Ram L., Seth, Prahlad K., Parmar, Devendra·2006·Molecular and Cellular Biochemistry

Abstract

Studies initiated to investigate the expression of cytochrome P450 2E1 (CYP2E1) in rat brain demonstrated low but detectable protein and mRNA expression in control rat brain. Though mRNA and protein expression of CYP2E1 in brain was several fold lower as compared to liver, relatively high activity of N-nitrosodimethylamine demethylase (NDMA-d) was observed in control rat brain microsomes. Like liver, pretreatment with CYP2E1 inducers such as ethanol or pyrazole or acetone significantly increased the activity of brain microsomal NDMA-d. Kinetic studies also showed an increase in the Vmax and affinity (Km) of the substrate towards the brain enzyme due to increased expression of CYP2E1 in microsomes of brain isolated from ethanol pretreated rats. In vitro studies using organic inhibitors, specific for CYP2E1 and anti-CYP2E1 significantly inhibited the brain NDMA-d activity indicating that like liver, NDMA-d activity in rat brain is catalyzed by CYP2E1. Olfactory lobes exhibited the highest CYP2E1 expression and catalytic activity in control rats. Furthermore, several fold increase in the mRNA expression and activity of CYP2E1 in cerebellum and hippocampus while a relatively small increase in the olfactory lobes and no significant change in other brain regions following ethanol pretreatment have indicated that CYP2E1 induction maybe involved in selective sensitivity of these brain areas to ethanol induced free radical damage and neuronal degeneration.

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Crossref · 10.1007/s11010-005-9109-z

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Authors
Yadav, S., Dhawan, A., Singh, R. L., Seth, P. K., & Parmar, D.
Affiliations
  • Indian Institute of Toxicology Research (IN)
  • Dr. Ram Manohar Lohia Avadh University (IN)
Corresponding author
Parmar, Devendra
Venue
Molecular and Cellular Biochemistry
Published
2006-04-21
Volume
286
Issue
1-2
Pages
171-180
ISSN
  • 0300-8177 (ISSN-L)
  • 1573-4919
OpenAlex
W1972609199
Cited by
45
References
44
Citations by year
2026: 1 · 2025: 2 · 2024: 2 · 2022: 1 · 2021: 2 · 2019: 4 · 2017: 3 · 2016: 3 · 2015: 2 · 2014: 3 · 2013: 4 · 2012: 1
FWCI
4.25
Type
journal article
Language
en
Open access
closed
Locations
  • Molecular and Cellular Biochemistry (publishedVersion)
  • PubMed (publishedVersion)
Funders
Iran Telecommunication Research Center
Topics
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Pharmacogenetics and Drug Metabolism
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Drug-Induced Hepatotoxicity and Protection
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Alcohol Consumption and Health Effects
Keywords
CYP2E1, brain microsomes, ethanol induction, pyrazole derivatives, acetone, olfactory lobe, cerebellum, hippocampus, oxidative damage, neurodegeneration, rat brain
MeSH terms
Acetone, Ethanol, Animals, Brain, Central Nervous System Depressants, Enzyme Inhibitors, Kinetics, Liver, Male, Microsomes, Pyrazoles, RNA, Messenger, Blotting, Western, Gene Expression Regulation, Enzymologic, Cytochrome P-450 CYP2E1, Reverse Transcriptase Polymerase Chain Reaction, Rats, Cytochrome P-450 CYP2E1 Inhibitors

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