RGD Reference Report - Cardiac remodelling hinders activation of cyclooxygenase-2, diminishing protection by delayed pharmacological preconditioning: role of HIF1 alpha and CREB. - Rat Genome Database

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Cardiac remodelling hinders activation of cyclooxygenase-2, diminishing protection by delayed pharmacological preconditioning: role of HIF1 alpha and CREB.

Authors: Feng, J  Lucchinetti, E  Fischer, G  Zhu, M  Zaugg, K  Schaub, MC  Zaugg, M 
Citation: Feng J, etal., Cardiovasc Res. 2008 Apr 1;78(1):98-107. doi: 10.1093/cvr/cvn016. Epub 2008 Jan 24.
RGD ID: 9068462
Pubmed: PMID:18218685   (View Abstract at PubMed)
DOI: DOI:10.1093/cvr/cvn016   (Journal Full-text)

AIMS: We tested whether delayed pharmacologic preconditioning elicited by isoflurane is protective in infarct-remodelled hearts. METHODS AND RESULTS: Male Wistar rats were treated with the preconditioning drug isoflurane 6 weeks after permanent ligation of the left anterior descending coronary artery. Twenty-four and 48 h later, hearts were perfused on the Langendorff system and treated with cyclooxygenase-2 or 12-lipoxygenase inhibitors before exposure to 40 min of ischaemia followed by 90 min of reperfusion. Infarct size was determined by triphenyltetrazolium chloride staining and lactate dehydrogenase release. Cyclooxygenase-2 expression and activity were measured by Western blotting and colorimetric assay. Nuclear translocation of cyclooxygenase-2-inducing transcription factors HIF1alpha, CREB, STAT3, and NFkappaB was determined. Post-infarct, remodelled hearts exhibit alterations in cellular signalling, time course and extent of isoflurane-induced late protection. While remodelled, preconditioned hearts exhibited protection exclusively at 24 h, healthy hearts showed sustained protection for up to 48 h, which correlated with cyclooxygenase-2 protein expression and enzymatic activity. The cyclooxygenase-2 inhibitors celecoxib and NS-398, but not the 12-lipoxygenase inhibitor cinnamyl-3,4-dihydroxycyanocinnamate, abolished delayed protection in both healthy and remodelled hearts, identifying cyclooxygenase-2 as a key mediator of late protection in both models. Isoflurane induced nuclear translocation of HIF1alpha in all hearts, but CREB was exclusively activated in healthy but not remodelled myocardium, which expressed higher levels of the CREB antagonist ICER. Delayed protection by isoflurane in remodelled hearts was more vulnerable to inhibition by celecoxib. CONCLUSION: Isoflurane failed to mobilize cyclooxygenase-2-inducing CREB in ICER-overexpressing, remodelled hearts, which was associated with a shortening of the second window of protection.



Gene Ontology Annotations    Click to see Annotation Detail View

Biological Process

  
Object SymbolSpeciesTermQualifierEvidenceWithNotesSourceOriginal Reference(s)
Hif1aRatresponse to anesthetic  IEP isofluraneRGD 

Objects Annotated

Genes (Rattus norvegicus)
Hif1a  (hypoxia inducible factor 1 subunit alpha)


Additional Information