Linked Life Data

2365281

Source:http://linkedlifedata.com/resource/pubmed/id/2365281

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
1990-8-15
pubmed:abstractText
In the iron-loaded liver there may be an increase in the putative intracellular transit pool of iron, components of which could be catalytically active in stimulating lipid peroxidation. To study the levels of low-molecular-weight, catalytically active iron in the liver, cytosolic ultrafiltrates were tested in an assay containing rat liver microsomes and NADPH. Malondialdehyde production was used as an index of lipid peroxidation. This assay system was sensitive enough to detect 0.25 mumol/L ferrous iron; progressive but non-linear increases in malondialdehyde were produced as the iron concentration was increased to 5 mumol/L. Ultrafiltrates from hepatic cytosol of iron-loaded rats had greater prooxidant action than did those from controls. When added to the assay, deferoxamine, an iron chelator, completely suppressed the prooxidant action of hepatic ultrafiltrates, showing that this activity is iron-dependent. Deferoxamine administered intraperitoneally to control animals at a dose of 1 gm/kg completely inhibited the prooxidant effect of hepatic ultrafiltrates prepared from rats killed after 1, 2 and 3 hr. Partial inhibition was observed at 4 hr; by 6 hr the inhibitory effect of deferoxamine was completely lost. Administration of deferoxamine (1 gm/kg intraperitoneally, 1 hr before killing) completely inhibited the prooxidant action of hepatic ultrafiltrates in moderately iron-loaded rats and controls but had no protective effect in heavily iron-loaded rats. These results support the concept that iron overload results in an increase in a hepatic cytosolic pool of low-molecular-weight iron that is catalytically active in stimulating lipid peroxidation. This pool can be chelated transiently in vivo by deferoxamine in moderate, but not heavy, iron overload.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
0270-9139
pubmed:author
pubmed:issnType
Print
pubmed:volume
11
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1038-43
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1990
pubmed:articleTitle
Increased prooxidant action of hepatic cytosolic low-molecular-weight iron in experimental iron overload.
pubmed:affiliation
Department of Medicine, Louisiana State University School of Medicine, Shreveport 71130.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't