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Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-4831

Feng, J; Lucchinetti, E; Fischer, G; Zhu, M; Zaugg, K; Schaub, M C; Zaugg, M (2008). Cardiac remodelling hinders activation of cyclooxygenase-2, diminishing protection by delayed pharmacological preconditioning: role of HIF1 alpha and CREB. Cardiovascular Research, 78(1):98-107.

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Abstract

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.

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13 citations in Web of Science®
14 citations in Scopus®
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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Center for Integrative Human Physiology
05 Vetsuisse Faculty > Institute of Laboratory Animal Science
04 Faculty of Medicine > Institute of Laboratory Animal Science

05 Vetsuisse Faculty > Institute of Food Safety and Hygiene
04 Faculty of Medicine > University Hospital Zurich > Institute of Anesthesiology
DDC:570 Life sciences; biology
610 Medicine & health
Language:English
Date:2008
Deposited On:03 Nov 2008 14:42
Last Modified:24 Dec 2013 11:44
Publisher:Oxford University Press
ISSN:0008-6363
Free access at:PubMed ID. An embargo period may apply.
Publisher DOI:10.1093/cvr/cvn016
PubMed ID:18218685

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