Linked Life Data

14610229

Source:http://linkedlifedata.com/resource/pubmed/id/14610229

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2004-1-28
pubmed:abstractText
CYP2G1 is a cytochrome P450 monooxygenase expressed uniquely in the olfactory mucosa (OM). We have generated Cyp2g1-null mice to identify the roles of CYP2G1 in the biology and the tissue-specific toxicity of xenobiotic compounds in the nose. Homozygous Cyp2g1-null mice are viable and fertile; they show no evidence of embryonic lethality, morphological abnormality, or developmental deficits; and they seem to have normal olfactory ability. However, OM microsomes from Cyp2g1-null mice were found to have significantly lower activities than microsomes from wild-type mice in the metabolism of testosterone and progesterone (approximately 60% decrease) and in the metabolic activation of coumarin (>70% decrease). Unexpectedly, a significant reduction in the expression of the Cyp2a5 gene was found in the liver, the lateral nasal gland (LNG), and, to a lesser extent, the kidney of adult Cyp2g1-null mice. The loss of CYP2G1 expression, and the associated decrease in the hepatic expression of CYP2A5, did not decrease systemic clearance, extent of hepatotoxicity, or OM toxicity of acetaminophen (AP). However, the LNG was protected from AP (at 400 mg/kg) toxicity in the Cyp2g1-null mice. Paradoxically, the LNG did not have detectable CYP2G1, and the decrease in LNG CYP2A5 expression in the Cyp2g1-null mice was not accompanied by decreases in microsomal AP metabolism. We hypothesize that OM CYP2G1 (through a paracrine pathway) or LNG CYP2A5 may indirectly influence resistance of the LNG to chemical toxicity, possibly by regulating gene expression in the LNG through steroid hormones or other endogenous P450 substrates and their metabolites.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0022-3565
pubmed:author
pubmed:issnType
Print
pubmed:volume
308
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
719-28
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed-meshheading:14610229-Acetaminophen, pubmed-meshheading:14610229-Animals, pubmed-meshheading:14610229-Anti-Inflammatory Agents, Non-Steroidal, pubmed-meshheading:14610229-Aryl Hydrocarbon Hydroxylases, pubmed-meshheading:14610229-Drug Toxicity, pubmed-meshheading:14610229-Female, pubmed-meshheading:14610229-Gene Expression, pubmed-meshheading:14610229-Male, pubmed-meshheading:14610229-Mice, pubmed-meshheading:14610229-Mice, Inbred C57BL, pubmed-meshheading:14610229-Mice, Inbred CBA, pubmed-meshheading:14610229-Mice, Transgenic, pubmed-meshheading:14610229-Mixed Function Oxygenases, pubmed-meshheading:14610229-Mutation, pubmed-meshheading:14610229-Nasal Mucosa, pubmed-meshheading:14610229-Olfactory Mucosa, pubmed-meshheading:14610229-Steroid Hydroxylases, pubmed-meshheading:14610229-Steroids
pubmed:year
2004
pubmed:articleTitle
Targeted disruption of the olfactory mucosa-specific Cyp2g1 gene: impact on acetaminophen toxicity in the lateral nasal gland, and tissue-selective effects on Cyp2a5 expression.
pubmed:affiliation
Wadsworth Center, New York State Department of Health, School of Public Health, State University of New York at Albany, 12201-0509, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.