Document Detail

Cyclooxygenase-1 and -2 knockout mice demonstrate increased cardiac ischemia/reperfusion injury but are protected by acute preconditioning.
MedLine Citation:
PMID:  11705824     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: The purpose of this study was to examine the effects of cyclooxygenase (COX) deficiency on baseline functional characteristics and on recovery of left ventricular developed pressure (LVDP) after 20 minutes of global ischemia and 40 minutes of reperfusion in untreated and preconditioned hearts. METHODS AND RESULTS: Compared with hearts from wild-type (WT) and COX-2(-/-) mice, baseline cardiac prostaglandin (PG) E(2) and 6-keto-PGF(1alpha) levels were significantly decreased in hearts from COX-1(-/-) mice. After ischemia, cardiac PGE(2) levels increased in WT, COX-1(-/-), and COX-2(-/-) mice (P<0.05). Recovery of function (LVDP) after global ischemia in hearts from COX-1(-/-) and COX-2(-/-) mice was significantly less than in WT hearts. Pretreatment of WT mice with indomethacin for 2 days before ischemia significantly decreased LVDP recovery; however, perfusion of WT hearts with indomethacin for 40 minutes before ischemia did not significantly alter LVDP recovery. Postischemic recovery of LVDP in COX-1(-/-) and COX-2(-/-) was unchanged by perfusion with 5 micromol/L PGE(2), PGD(2), PGF(2alpha), or carboprostacyclin. Hearts from COX-2(-/-) mice showed an increase in ischemic contracture compared with hearts from WT and COX-1(-/-) mice; however, hearts did not differ in intracellular pH, ATP, or inorganic phosphate during ischemia. Ischemic preconditioning significantly improved postischemic LVDP recovery in COX-1(-/-), COX-2(-/-), and WT mice. CONCLUSIONS: Genetic disruption or 2-day chemical inhibition of COX-1 and COX-2 decreases recovery of LVDP after ischemia; however, acute perfusion with indomethacin is not detrimental. These data are consistent with protection due to the altered expression of some protein that is modulated by COX or its metabolites.
M G Camitta; S A Gabel; P Chulada; J A Bradbury; R Langenbach; D C Zeldin; E Murphy
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Publication Detail:
Type:  In Vitro; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Circulation     Volume:  104     ISSN:  1524-4539     ISO Abbreviation:  Circulation     Publication Date:  2001 Nov 
Date Detail:
Created Date:  2001-11-13     Completed Date:  2001-12-07     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0147763     Medline TA:  Circulation     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2453-8     Citation Subset:  AIM; IM    
NIEHS, NIH, Research Triangle Park, Division of Pediatric Cardiology, Duke University Medical Center, Durham, NC, USA.
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MeSH Terms
Cyclooxygenase 1
Cyclooxygenase 2
Cyclooxygenase 2 Inhibitors
Cyclooxygenase Inhibitors / pharmacology
Hydrogen-Ion Concentration
Indomethacin / pharmacology
Ischemic Preconditioning, Myocardial*
Isoenzymes / antagonists & inhibitors,  genetics*,  physiology*
Membrane Proteins
Mice, Knockout
Myocardial Contraction
Myocardial Reperfusion Injury / etiology*,  physiopathology,  therapy
Organ Culture Techniques
Phosphates / metabolism
Prostaglandin-Endoperoxide Synthases / genetics*,  physiology*
Prostaglandins / pharmacology
Ventricular Pressure
Reg. No./Substance:
0/Cyclooxygenase 2 Inhibitors; 0/Cyclooxygenase Inhibitors; 0/Isoenzymes; 0/Membrane Proteins; 0/Phosphates; 0/Prostaglandins; 53-86-1/Indomethacin; EC 1; EC 2; EC Synthases; EC protein, mouse

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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