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Human cytochrome (CYP)2B6 cDNA was cloned and expressed in bacteria and in yeast. Its expression in Saccharomyces cerevisiae enabled us to obtain, at a high level, an active yeast-expressed CYP2B6 protein, so as to assess its role in the metabolism of ethoxyresorufin, pentoxyresorufin, benzyloxyresorufin, ethoxycoumarin, testosterone and cyclophosphamide.(More)
OBJECTIVE The aim of this work was to study simultaneously the expression profile of the 23 CYP mRNAs of CYP1, CTP2 and CYP3 families in 22 different human tissues namely adrenal gland, bladder, bone marrow, colon, fetal liver, heart, kidney, liver, lung, mammary gland, ovary, placenta, prostate, salivary gland, skeletal muscle, small intestine, spleen,(More)
Cytochrome P450 (P450) enzymes and ATP-binding cassette (ABC) transporters modulate the transport and metabolism of both endogenous and exogenous substrates and could play crucial roles in the human brain. In this study, we report the transcript expression profile of seven ABC transporters (ABCB1, ABCC1-C5, and ABCG2), 24 P450s (CYP1, CYP2, and CYP3(More)
The organ distribution of microsomal cytochrome P 450 isoenzymes (P 450), microsomal epoxide hydrolase (EH) and cytosolic glutathione-S-transferases was investigated by immunoblotting and enzyme measurements in rats and humans. In rats, P 450 IA1 was detected only in the duodenum, and P 450 IA2 and IIC11 were detected only in the liver. The highest(More)
We have established the expression patterns of the genes encoding ATP-binding cassette (ABC) transporters and cytochromes P450 (CYPs) at the adult human blood-brain barrier (BBB) using isolated brain microvessels and cortex biopsies from patients with epilepsia or glioma. Microves synaptophysin (neurons) and neuron-glial antigen 2 (NG2) (pericytes). ABCG2(More)
UNLABELLED The gut microbiota enhances the host's metabolic capacity for processing nutrients and drugs and modulate the activities of multiple pathways in a variety of organ systems. We have probed the systemic metabolic adaptation to gut colonization for 20 days following exposure of axenic mice (n = 35) to a typical environmental microbial background(More)
To investigate whether interindividual variation in CYP2E1 levels can be explained by genetic polymorphism, we analysed DNA samples from 40 healthy individuals by single-strand conformational polymorphism analysis for polymorphisms in the CYP2E1 coding sequence and promoter region. DNA sequencing of samples showing mobility shifts on single-strand(More)
Cytochrome P450 mediated metabolism of methyleugenol to the proximate carcinogen 1'-hydroxymethyleugenol has been investigated in vitro. Kinetic studies undertaken in liver microsomes from control male Fischer 344 rats revealed that this reaction is catalyzed by high affinity (Km of 74.9 +/- 9.0 microM, Vmax of 1.42 +/- 0.17 nmol/min/nmol P450) and low(More)
Drug metabolism in humans is essentially performed by three cytochrome P450 (P450) families (1 to 3), including 23 isoforms. The expression of these P450s is highly variable, and the rate and nature of the metabolites produced depend on the nature and the concentration of individual isoforms. P450 expression pattern is therefore a necessary tool to evaluate(More)
Ethylene dibromide (1,2-dibromoethane, EDB) is metabolized by two routes: a conjugative route catalyzed by glutathione S-transferases (GST) and an oxidative route catalyzed by cytochrome P450 (P450). The GST route is associated with carcinogenicity. An approach is presented to use human purified GST and P450 enzymes to explore the importance of these(More)