Faculty Collaboration Database

Anesthetic preconditioning improves adenosine triphosphate synthesis and reduces reactive oxygen species formation in mitochondria after ischemia by a redox dependent mechanism. Anesthesiology 2003 May;98(5):1155-63

Date

04/30/2003

Pubmed ID

12717137

DOI

10.1097/00000542-200305000-00018

Scopus ID

2-s2.0-0037406779 (requires institutional sign-in at Scopus site)   80 Citations

Abstract

BACKGROUND: Mitochondrial changes that characterize the heart after anesthetic preconditioning (APC) or the mechanisms by which mitochondrial triggering factors lead to protection are unknown. This study hypothesized that generation of reactive oxygen species (ROS) during APC is required to initiate the mitochondrial protective effects, and that APC leads to improved mitochondrial electron transport chain function and cardiac function during reperfusion.

METHODS: Isolated guinea pig hearts were subject to 30 min ischemia and 120 min reperfusion. Prior to ischemia hearts were either untreated (I/R), or treated with sevoflurane (APC), in the presence or absence of the ROS scavenger tiron (TIR), or the superoxide dismutase mimetic MnTBAP (TBAP). Intracellular ROS were measured by spectrofluorometry using the fluorescent probe dihydroethidium (DHE). In another series of experiments, using the same protocol, hearts were reperfused for only 5 min and removed for measurement of adenosine triphosphate (ATP) synthesis by luciferin-luciferase luminometry and ROS generation by dichlorohydro-fluorescein (DCF) fluorescence in isolated mitochondria.

RESULTS: The APC improved cardiac function and reduced infarction. Tiron or MnTBAP abrogated the protection afforded by APC. Mitochondrial ATP synthesis was decreased by 70 +/- 3% after IR alone, by only 7 +/- 3% after APC, by 69 +/- 2% after APC+TIR, and by 71 +/- 3% after APC + TBAP. Mitochondrial ROS formation (DCF) increased by 48 +/- 3% after IR alone, by 0 +/- 2% after APC, by 43 +/- 4% after APC + TIR, and by 46 +/- 3% after APC + TBAP. ROS generation (DHE) was increased in I/R group at 5 and 120 min reperfusion. This was attenuated by APC but this protective effect was abrogated in APC + TIR and APC + TBAP groups.

CONCLUSIONS: The results indicate that ROS are central both in triggering and mediating APC, and that the mitochondrion is the target for these changes.

Author List

Novalija E, Kevin LG, Eells JT, Henry MM, Stowe DF

Author

Janis Eells PhD Professor in the Biomedical Sciences department at University of Wisconsin - Milwaukee

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

Adenosine Triphosphate
Animals
Cell Fractionation
Coronary Circulation
Guinea Pigs
Heart
In Vitro Techniques
Ischemic Preconditioning, Myocardial
Mitochondria, Heart
Models, Animal
Myocardial Reperfusion
Oxidation-Reduction
Reactive Oxygen Species
Time Factors
Ventricular Function, Left