Linked Life Data

9731571

Source:http://linkedlifedata.com/resource/pubmed/id/9731571

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1998-9-17
pubmed:abstractText
The present work investigates the relationship between adenosine, nitric oxide (NO), and free radicals during ischemic preconditioning in rat liver. For this purpose, we evaluated: 1) the efficacy of different periods of preconditioning; 2) the changes in the concentration of adenine nucleotides during preconditioning; 3) the importance of adenosine and xanthine concentrations in the induction of preconditioning; and 4) the possible effect of xanthine oxidase-derived superoxide anion on NO during preconditioning. Results show that just a 10- to 15-minute period of ischemia followed by 10-minute reperfusion prevents the ischemic damage that would be induced by a subsequent 90 minutes of ischemia followed by 90 minutes of reperfusion. Administration of xanthine or metabolization of endogenous adenosine abolishes the protective effect of preconditioning. When rats have been subjected to a period of preconditioning not within the effective time window (10-15 minutes), and thus offering no protection, the administration of a NO donor was found to restore the protection. The dose needed to restore protection appears to be proportional to the endogenous xanthine concentration. In addition, when xanthine oxidase was inhibited, preconditioning effectively offered protection in front of ischemia and reperfusion, independently of the xanthine concentration. Altogether, this indicates that the time window of ischemia capable to induce preconditioning in liver is defined by the relative tissue concentrations of adenosine and xanthine. The lower limit of this window (10 minutes) is defined by the amount of adenosine able to induce NO generation. Its upper limit (15 minutes) is defined by the concentration of xanthine able to remove the generated NO.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
0270-9139
pubmed:author
pubmed:issnType
Print
pubmed:volume
28
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
768-73
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1998
pubmed:articleTitle
Hepatic preconditioning in rats is defined by a balance of adenosine and xanthine.
pubmed:affiliation
Department of Medical Bioanalysis, IIBB-CSIC, IDIBAPS, Barcelona, Spain.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't