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Prostaglandins Other Lipid Mediat. 2009 Nov;90(1-2):21-5. doi: 10.1016/j.prostaglandins.2009.06.006. Epub 2009 Jun 25.

Comparison of microsomal prostaglandin E synthase-1 deletion and COX-2 inhibition in acute cardiac ischemia in mice.

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1
Department of Research, Division of Neonatology, Mount Sinai Medical Center, 4300 Alton Road, Miami Beach, FL 33140, USA. dwu@msmc.com

Abstract

The aim of the present study was to compare the effects of genetic mPGES-1 loss and COX-2 inhibition on myocardial damage after coronary occlusion. mPGES-1(-/-) mice and their wild-type littermates were injected with vehicle or COX-2 inhibitor (celecoxib), and 30min later the left coronary artery was surgically occluded. At 24h, myocardial infarct (MI) volume was measured histologically. Post-MI survival was reduced in WT mice receiving celecoxib (12/20) compared with vehicle-treated controls (12/12) or the loss of mPGES-1 (13/13) together with increased phosphokinase (CPK) and cardiac troponin-I release. Endogenous mPGES-1 expression was unchanged by ischemia in WT mice and absent in mPGES-1(-/-) hearts. COX-2 expression was markedly increased at 24h after MI in WT hearts; this upregulation was largely attenuated in mPGES-1(-/-) mice. We conclude that loss of mPGES-1 prevents the upregulation of COX-2 after myocardial infarct, and in contrast to inhibition of COX-2, does not increase ischemic myocardial damage.

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