Linked Life Data

2765498

Source:http://linkedlifedata.com/resource/pubmed/id/2765498

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
10
pubmed:dateCreated
1989-9-28
pubmed:abstractText
The ethanol-inducible form of cytochrome P-450 (P-450IIE1) has previously been shown to exhibit an unusually high rate of oxidase activity with the subsequent formation of reactive oxygen species, e.g., hydrogen peroxide, and to be the main contributor of microsomal oxidase activity in liver microsomes from acetone-treated rats [Ekström & Ingelman-Sundberg (1989) Biochem. Pharmacol. (in press)]. The results here presented indicate that oxygen exposure of rats causes an about 4-fold induction of P-450IIE1 in rat liver and lung microsomes. The induction in liver was not accompanied by any measurable increase in the P-450IIE1 mRNA levels, but the enhanced amount of P-450IIE1 accounted for 60% of the net 50% increase in the level of hepatic P-450 as determined spectrophotometrically. The induction of P-450IIE1 was maximal after 60 h of O2 exposure, and concomitant increases in the rates of liver microsomal CCl4-dependent lipid peroxidation, O2 consumption, NADPH oxidation, O2- formation, H2O2 production, and NADPH-dependent microsomal lipid peroxidation were seen. Liver microsomes from oxygen-treated rats had very similar properties to those of microsomes isolated from acetone-treated rats with respect to the P-450IIE1 content and catalytic properties, but different from those of thyroxine-treated animals. Treatment of rats with the P-450IIE1 inducer acetone in combination with oxygen exposure caused a potentiation of the NADPH-dependent liver and lung microsomal lipid peroxidation and decreased the survival time of the rats. The results reached indicate a role for cytochrome P-450 and, in particular, for cytochrome P-450IIE1 in oxygen-mediated tissue toxicity.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0006-2960
pubmed:author
pubmed:issnType
Print
pubmed:day
16
pubmed:volume
28
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
4499-504
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1989
pubmed:articleTitle
Cytochrome P-450 and oxygen toxicity. Oxygen-dependent induction of ethanol-inducible cytochrome P-450 (IIE1) in rat liver and lung.
pubmed:affiliation
Department of Physiological Chemistry, Karolinska Institute, Stockholm, Sweden.
pubmed:publicationType
Journal Article, In Vitro, Research Support, Non-U.S. Gov't