0000000000547834

AUTHOR

J.a. Beamand

showing 4 related works from this author

Metabolism of coumarin by precision-cut calf liver slices and calf liver microsomes.

1995

1. The metabolism of 50 microM [3-14C]coumarin has been studied in precision-cut-calf liver slices. 2. The metabolism of 50 microM coumarin to 7-hydroxycoumarin has also been examined in calf, rat, Cynomolgus monkey and human liver microsomal preparations. 3. In precision-cut calf liver slices, [3-14C]coumarin was metabolized to various polar products and to metabolite(s) that bound covalently to calf liver slice proteins. The polar products included 7-hydroxycoumarin (which was extensively conjugated with D-glucuronic acid and/or sulphate), metabolites of the 3-hydroxylation pathway (mainly o-hydroxyphenylethanol and o-hydroxyphenylacetic acid), and unknown metabolites. 4. Coumarin 7-hydro…

MaleHealth Toxicology and MutagenesisMetaboliteIn Vitro TechniquesToxicologyBiochemistryRats Sprague-Dawleychemistry.chemical_compoundSpecies SpecificityCoumarinsmedicineAnimalsHumansPharmacologybiologyMethoxsalenReproducibility of ResultsGeneral MedicineMetabolismbiology.organism_classificationCoumarinEnzyme assayRatsMacaca fascicularischemistryMicrosomaBiochemistryLiverMicrosomebiology.proteinMicrosomes LiverCattleDrug metabolismmedicine.drugXenobiotica; the fate of foreign compounds in biological systems
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Effect of some indole derivatives on xenobiotic metabolism and xenobiotic-induced toxicity in cultured rat liver slices.

1999

In this study the effect of some indole derivatives on xenobiotic metabolizing enzymes and xenobiotic-induced toxicity has been examined in cultured precision-cut liver slices from male Sprague-Dawley rats. While treatment of rat liver slices for 72 hours with 2-200 microM of either indole-3-carbinol (I3C) or indole-3-acetonitrile (3-ICN) had little effect on cytochrome P-450 (CYP)-dependent enzyme activities, enzyme induction was observed after in vivo administration of I3C. The treatment of rat liver slices with 50 microM 3,3'-diindolylmethane (DIM; a dimer derived from I3C under acidic conditions) for 72 hours resulted in a marked induction of CYP-dependent enzyme activities. DIM appears…

Male33'-DiindolylmethaneAflatoxin B1IndolesCarcinogenicity TestsDiindolylmethaneIn Vitro TechniquesToxicologyXenobioticsRats Sprague-Dawleychemistry.chemical_compoundCytochrome P-450 Enzyme SystemAnimalsAnticarcinogenic AgentsDrug InteractionsEnzyme inducerMonocrotalinebiologyCytochrome P450General MedicineGlutathioneRatschemistryBiochemistryLiverToxicitybiology.proteinCarcinogensXenobioticDrug metabolismFood ScienceFood and chemical toxicology : an international journal published for the British Industrial Biological Research Association
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Induction of cytochrome P450 isoenzymes in cultured precision-cut rat and human liver slices

1996

1. The effect of some xenobiotics on levels of selected cytochrome P450 (CYP) isoenzymes determined by Western immunoblotting and associated enzyme activities has been studied in 72-h cultured rat and human precision-cut liver slices. 2. In cultured rat liver slices, 0.5 mM sodium phenobarbitone (PB), 25 microM beta-naphthoflavone (BNF), and 20 micrograms/ml Aroclor 1254 (ARO) induced mixed-function oxidase enzyme activities. Western immunoblotting of liver slice microsomes was performed with antibodies to rat CYP1A2, 2B1/2 and 3A. Compared with 72-h control (dimethyl sulphoxide only treated) rat liver slice microsomes, PB induced CYP2B1/2 and 3A, BNF induced CYP1A2, and ARO induced CYP1A2,…

MaleAroclorsmedicine.medical_specialtyHealth Toxicology and MutagenesisToxicologyMicrobodiesBiochemistryIsozymeRats Sprague-DawleyClofibric AcidCytochrome P-450 Enzyme Systembeta-NaphthoflavoneCulture TechniquesInternal medicinemedicineAnimalsHumansEnzyme inducerBenzoflavonesPharmacologychemistry.chemical_classificationOxidase testbiologyFibric AcidsCytochrome P450General MedicineChlorodiphenyl (54% Chlorine)In vitroRatsIsoenzymesPyrimidinesEndocrinologyEnzymeLiverchemistryEnzyme InductionPhenobarbitalClofenapatebiology.proteinMicrosomeCiprofibratemedicine.drugXenobiotica
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Comparison of the metabolism of 7-ethoxycoumarin and coumarin in precision-cut rat liver and lung slices

1995

The metabolism of 7-ethoxycoumarin and [3-(14)C]coumarin was compared in precision-cut rat liver and lung slices. The lung slices were prepared using an agarose gel instilling technique enabling the production of tissue cylinders followed by lung slices employing a Krumdieck tissue slicer. Both 50 microM 7-ethoxycoumarin and 50 microM [3-(14)C]coumarin were metabolized by rat liver and lung slices. 7-Ethoxycoumarin was converted to 7-hydroxycoumarin (7-HC) which was conjugated with both D-glucuronic acid and sulfate. 7-HC sulfate was the major metabolite formed by both liver and lung slices. [3-(14)C]Coumarin was metabolized by rat liver and lung slices to both polar products and to metabol…

MaleMetaboliteGlucuronatesBiologyToxicologyRats Sprague-Dawleychemistry.chemical_compoundGlucuronic AcidCoumarinsCulture TechniquesmedicineAnimalsUmbelliferonesLungLungSulfatesCytochrome P450General MedicineMetabolismCoumarinGlucuronic acidRatsmedicine.anatomical_structureLiverchemistryBiochemistryIsotope Labelingbiology.proteinAgaroseDrug metabolismFood ScienceFood and Chemical Toxicology
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