title: Mediators of rat ischemic hepatic preconditioning after cold preservation identified by microarray analysis.
abstract: Hepatic ischemia-reperfusion injury associated with liver transplantation is an as yet unresolved problem in clinical practice. Preconditioning protects the liver against the deleterious effects of ischemia, although the mechanism underlying this preconditioning is still unclear. To profile gene expression patterns involved in hepatic ischemic preconditioning, we analyzed the changes in gene expression in rat livers by DNA microarray analysis. Approximately 116 genes were found to have altered gene expression after 8 hours of cold ischemia. Moreover, the expression of 218 genes was modified by classic preconditioning followed by the same ischemia process. Given the importance of the effects of ischemic preconditioning (IP) in minimizing the liver damage induced by sustained ischemia before reperfusion, this study analyzed the putative genes involved in the beneficial role of IP in liver grafts undergoing cold ischemia before its implantation in the recipient (IP+I). Great differences were found in the gene expression pattern of ischemic preconditioning + long cold ischemia (IP+I) group when compared with the long cold ischemia alone condition (I), which could explain the protective regulatory mechanisms that take place after preconditioning. Twenty-six genes that were downregulated in cold ischemia were found upregulated after preconditioning preceding a long cold ischemia period. These would be genes activated or maintained by preconditioning. Heat shock protein genes and 3-hydroxy-3-methylglutaryl-coenzyme A reductase are among the most markedly induced transcripts.
authors.affiliation: Unitat de Bioquímica, Departament de Ciències Fisiològiques II, Campus de Bellvitge, IDIBELL-Universitat de Barcelona, Feixa Llarga s/n E-08907 L'Hospitalet, Spain.
authors.forename: Aurea
authors.initials: A
authors.lastname: Navarro-Sabaté
authors.forename: Carmen
authors.initials: C
authors.lastname: Peralta
authors.forename: Maria Nieves
authors.initials: MN
authors.lastname: Calvo
authors.forename: Anna
authors.initials: A
authors.lastname: Manzano
authors.forename: Marta
authors.initials: M
authors.lastname: Massip-Salcedo
authors.forename: Joan
authors.initials: J
authors.lastname: Roselló-Catafau
authors.forename: Ramon
authors.initials: R
authors.lastname: Bartrons
mesh_terms: D000818:Animals; D050377:Cold Ischemia; D003199:Computer Systems; D015536:Down-Regulation; D015870:Gene Expression; D020869:Gene Expression Profiling; D005786:Gene Expression Regulation; D006360:Heat-Shock Proteins / Q000235:genetics; D006903:Hydroxymethylglutaryl CoA Reductases / Q000235:genetics; D019194:Ischemic Preconditioning; D008099:Liver / Q000098:blood supply* / Q000378:metabolism*; D008297:Male; D020411:Oligonucleotide Array Sequence Analysis; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D013997:Time Factors; D015854:Up-Regulation
chemical_list: D006360:Heat-Shock Proteins; D012333:RNA, Messenger; D006903:Hydroxymethylglutaryl CoA Reductases