Linked Life Data

16762476

Source:http://linkedlifedata.com/resource/pubmed/id/16762476

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
9
pubmed:dateCreated
2006-7-10
pubmed:abstractText
In humans, apiaceous vegetables (carrots, parsnips, celery, parsley, etc.) inhibit cytochrome P-450 1A2, a biotransformation enzyme known to activate several procarcinogens, including aflatoxin B1 (AFB). We evaluated eight phytochemicals from apiaceous vegetables for effects on human cytochrome P-450 1A2 (hCYP1A2) activity using a methoxyresorufin O-demethylase (MROD) assay and a trp-recombination assay. Saccharomyces cerevisiae was used for heterologous CYP1A2 expression and this yeast strain is also diploid and auxotrophic for tryptophan due to mutations in the trp5 alleles. When these two alleles undergo AFB-induced mitotic recombination, gene conversion occurs, allowing yeast to grow in the absence of tryptophan. The apiaceous constituents psoralen, 5-methoxypsoralen (5-MOP), 8-methoxypsoralen (8-MOP), and apigenin were potent inhibitors of hCYP1A2-mediated MROD activity in yeast microsomes, whereas quercetin was a modest hCYP1A2 inhibitor. Naringenin, caffeic acid, and chlorogenic acid did not inhibit hCYP1A2-mediated MROD activity. The 2-h pretreatment of intact yeast cells with psoralen, 5-MOP, and 8-MOP significantly improved cell survival after subsequent 4-h AFB treatment and reduced hCYP1A2-mediated mutagenicity of AFB. Apigenin also significantly decreased mutagenicity. These results suggest that in vivo CYP1A2 inhibition by apiaceous vegetables may be due to the phytochemicals present and imply that apiaceous vegetable intake may be chemopreventive by inhibiting CYP1A2-mediated carcinogen activation.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
0278-6915
pubmed:author
pubmed:issnType
Print
pubmed:volume
44
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1474-84
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed-meshheading:16762476-Aflatoxin B1, pubmed-meshheading:16762476-Apiaceae, pubmed-meshheading:16762476-Biotransformation, pubmed-meshheading:16762476-Cell Survival, pubmed-meshheading:16762476-Cytochrome P-450 CYP1A2, pubmed-meshheading:16762476-Cytochrome P-450 Enzyme System, pubmed-meshheading:16762476-Enzyme Inhibitors, pubmed-meshheading:16762476-Flavonoids, pubmed-meshheading:16762476-Humans, pubmed-meshheading:16762476-Inhibitory Concentration 50, pubmed-meshheading:16762476-Microsomes, pubmed-meshheading:16762476-Mutagens, pubmed-meshheading:16762476-Oxidoreductases, pubmed-meshheading:16762476-Plant Extracts, pubmed-meshheading:16762476-Poisons, pubmed-meshheading:16762476-Psoralens, pubmed-meshheading:16762476-Recombination, Genetic, pubmed-meshheading:16762476-Saccharomyces cerevisiae
pubmed:year
2006
pubmed:articleTitle
Apiaceous vegetable constituents inhibit human cytochrome P-450 1A2 (hCYP1A2) activity and hCYP1A2-mediated mutagenicity of aflatoxin B1.
pubmed:affiliation
Interdisciplinary Graduate Program in Nutritional Sciences, University of Washington, and Fred Hutchinson Cancer Research Center, Seattle, WA 98195-4695, USA.
pubmed:publicationType
Journal Article, Research Support, N.I.H., Extramural