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Role of endothelial nitric oxide synthase as a trigger and mediator of isoflurane-induced delayed preconditioning in rabbit myocardium. Anesthesiology 2005 Jul;103(1):74-83

Date

06/29/2005

Pubmed ID

15983459

DOI

10.1097/00000542-200507000-00014

Abstract

BACKGROUND: Isoflurane produces delayed preconditioning in vivo. The authors tested the hypothesis that endothelial, inducible, or neuronal nitric oxide synthase (NOS) is a trigger or mediator of this protective effect.

METHODS: In the absence or presence of exposure to isoflurane (1.0 minimum alveolar concentration) 24 h before experimentation, pentobarbital-anesthetized rabbits (n = 128) instrumented for hemodynamic measurement received 0.9% saline (control), the nonselective NOS inhibitor N-nitro-l-arginine methyl ester (10 mg/kg), one of two of the selective inducible NOS antagonists aminoguanidine (300 mg/kg) or 1400W (0.5 mg/kg), or the selective neuronal NOS inhibitor 7-nitroindazole (50 mg/kg) administered before exposure to isoflurane (trigger; day 1) or left anterior descending coronary artery occlusion (mediator; day 2). All rabbits underwent 30 min of coronary occlusion followed by 3 h of reperfusion. Tissue samples for reverse-transcription polymerase chain reaction and immunohistochemistry were also obtained in the presence or absence of N-nitro-l-arginine methyl ester with or without isoflurane pretreatment.

RESULTS: Isoflurane significantly (P < 0.05) reduced infarct size (23 +/- 5% [mean +/- SD] of the left ventricular area at risk; triphenyltetrazolium chloride staining) as compared with control (42 +/- 7%). N-nitro-l-arginine methyl ester administered before isoflurane or coronary occlusion abolished protection (49 +/- 7 and 43 +/- 10%, respectively). Aminoguanidine, 1400W, and 7-nitroindazole did not alter infarct size or affect isoflurane-induced delayed preconditioning. Isoflurane increased endothelial but not inducible NOS messenger RNA transcription and protein translation immediately and 24 h after administration of the volatile agent. Pretreatment with N-nitro-l-arginine methyl ester attenuated isoflurane-induced increases in endothelial NOS expression.

CONCLUSIONS: The results suggest that endothelial NOS but not inducible or neuronal NOS is a trigger and mediator of delayed preconditioning by isoflurane in vivo.

Author List

Chiari PC, Bienengraeber MW, Weihrauch D, Krolikowski JG, Kersten JR, Warltier DC, Pagel PS

Authors

Paul S. Pagel MD, PhD Professor in the Anesthesiology department at Medical College of Wisconsin
Dorothee Weihrauch DVM, PhD Professor in the Anesthesiology department at Medical College of Wisconsin




MESH terms used to index this publication - Major topics in bold

Animals
Ischemic Preconditioning, Myocardial
Isoflurane
Male
Myocardial Infarction
Myocardium
Nitric Oxide Synthase
Nitric Oxide Synthase Type III
Rabbits
jenkins-FCD Prod-410 e9586552fe7f53c71f7923aa6e27aeabbd3c2473