Linked Life Data

1423267

Source:http://linkedlifedata.com/resource/pubmed/id/1423267

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
22
pubmed:dateCreated
1992-12-9
pubmed:abstractText
The nitrated polycyclic aromatic hydrocarbon 1-nitropyrene is a ubiquitous environmental pollutant. The role of cytochromes P-450 in the human metabolism of [3H]-1-nitropyrene was investigated using human liver microsomes. The range of microsomal metabolism from 16 individual liver specimens was 0.13 to 0.99 nmol/min/mg protein. Using 3 microsomal samples exhibiting different maximal velocities, the Km of 1-nitropyrene metabolism was 3.3 +/- 0.5 microM, indicating that perhaps a single or similar cytochromes P-450 was involved in the metabolism of 1-nitropyrene in these samples. The P-450 3A inhibitor triacetyloleandomycin inhibited 86 +/- 8% of the microsomal metabolism of 1-nitropyrene. Further evidence for the role of P-450 3A in human microsomal metabolism of 1-nitropyrene was gained using inhibitory anti-P-450 3A antibodies. Using 3 separate microsomal samples, antibody conditions that inhibited approximately 90% of the metabolism of the P-450 3A4-specific substrate nifedipine inhibited approximately 60-70% of the metabolism of 1-nitropyrene. Human liver microsomes demonstrated a preference for 1-nitropyren-3-ol formation over 1-nitropyren-6-ol or 1-nitropyren-8-ol, which is in contrast to that noted in rodents where the 6-ol and 8-ol are preferentially formed over the 3-ol, yet in agreement with earlier studies on the metabolism of 1-nitropyrene using Vaccinia-expressed human cytochromes P-450. These results indicate that the human hepatic metabolism of 1-nitropyrene is carried out by at least two or more P-450s including those in the P-450 3A subfamily. These studies also suggest that the metabolism of this compound by humans may differ from that in rodents in both the cytochromes that are involved and the specific metabolites that are formed.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
http://linkedlifedata.com/resource/pubmed/chemical/1-nitropyrene, http://linkedlifedata.com/resource/pubmed/chemical/Antibodies, http://linkedlifedata.com/resource/pubmed/chemical/CYP3A protein, human, http://linkedlifedata.com/resource/pubmed/chemical/Cytochrome P-450 CYP3A, http://linkedlifedata.com/resource/pubmed/chemical/Cytochrome P-450 Enzyme System, http://linkedlifedata.com/resource/pubmed/chemical/Isoenzymes, http://linkedlifedata.com/resource/pubmed/chemical/Mixed Function Oxygenases, http://linkedlifedata.com/resource/pubmed/chemical/Oxygenases, http://linkedlifedata.com/resource/pubmed/chemical/Phenols, http://linkedlifedata.com/resource/pubmed/chemical/Pyrenes, http://linkedlifedata.com/resource/pubmed/chemical/Tritium, http://linkedlifedata.com/resource/pubmed/chemical/dimethylaniline monooxygenase...
pubmed:status
MEDLINE
pubmed:month
Nov
pubmed:issn
0008-5472
pubmed:author
pubmed:issnType
Print
pubmed:day
15
pubmed:volume
52
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
6237-43
pubmed:dateRevised
2010-11-18
pubmed:meshHeading
pubmed:year
1992
pubmed:articleTitle
Cytochrome P-450 3A4 (nifedipine oxidase) is responsible for the C-oxidative metabolism of 1-nitropyrene in human liver microsomal samples.
pubmed:affiliation
Department of Environmental Health Sciences, School of Medicine, Case Western Reserve University, Cleveland, Ohio 44106-4940.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.