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Delayed cardioprotection with isoflurane: role of reactive oxygen and nitrogen. Am J Physiol Heart Circ Physiol 2005 Jan;288(1):H175-84

Date

09/25/2004

Pubmed ID

15388508

DOI

10.1152/ajpheart.00494.2004

Scopus ID

2-s2.0-11144258652   35 Citations

Abstract

We determined whether isoflurane can confer delayed cardioprotection in the adult rat by triggering increased production of reactive oxygen (ROS) and nitrogen species (RNS). Our objectives were to determine 1) the concentration of isoflurane that confers delayed cardioprotection in the adult rat, 2) the role of ROS and RNS in the induction of delayed cardioprotection, and 3) the cellular sources of ROS and RNS responsible for induction of delayed cardioprotection by isoflurane. Male Sprague-Dawley rats at 8 wk of age (n = 8 rats/group) were exposed to 0.5%, 0.8%, 1%, and 2% (vol/vol) isoflurane-100% oxygen for 2 h. Isoflurane conferred delayed cardioprotection 24 h later at a concentration of 0.8% (vol/vol). Administration of manganese (III) tetrakis (4-benzoic acid)porphyrin chloride (MnTBAP), a superoxide scavenger (15 mg/kg ip), or N(G)-nitro-L-arginine methyl ester (L-NAME), a general nitric oxide synthase inhibitor (15 mg/kg ip), 15 min before isoflurane treatment abolished the delayed cardioprotective effects of isoflurane. MnTBAP and L-NAME had no effect on delayed cardioprotection in untreated hearts. Perfusion of isolated hearts with hydroethidine, a fluorescent probe for superoxide, after isoflurane treatment resulted in a twofold increase in ethidine staining of isoflurane-treated hearts compared with untreated controls, which was attenuated by myxothiazol, an inhibitor of the mitochondrial electron transport chain (0.2 mg/kg ip) and L-NAME (15 mg/kg ip). Nitrite and nitrate content in isoflurane-treated hearts was 1.5-fold higher than in untreated hearts, whereas myocardial reduced glutathione levels were decreased by 13% in 0.8% but not in 1.0% isoflurane-treated hearts. We conclude that isoflurane confers delayed cardioprotection in the adult rat, triggered by ROS and RNS.

Author List

Shi Y, Hutchins WC, Su J, Siker D, Hogg N, Pritchard KA Jr, Keszler A, Tweddell JS, Baker JE

Authors

John E. Baker PhD Professor in the Surgery department at Medical College of Wisconsin
Neil Hogg PhD Associate Dean, Professor in the Biophysics department at Medical College of Wisconsin
Kirkwood A. Pritchard PhD Professor in the Surgery department at Medical College of Wisconsin




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

Anesthetics, Inhalation
Animals
Cytoprotection
Gases
Glutathione
Heart
Isoflurane
Male
Myocardium
Nitric Oxide
Nitric Oxide Synthase
Oxidation-Reduction
Rats
Rats, Sprague-Dawley
Reactive Nitrogen Species
Reactive Oxygen Species
Superoxide Dismutase
Time Factors
jenkins-FCD Prod-482 91ad8a360b6da540234915ea01ff80e38bfdb40a