Document Detail


Isoflurane preconditioning decreases myocardial infarction in rabbits via up-regulation of hypoxia inducible factor 1 that is mediated by mammalian target of rapamycin.
MedLine Citation:
PMID:  18292679     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: Volatile anesthetics are known to protect the heart against ischemia-reperfusion injury. The authors tested whether anesthetic preconditioning with isoflurane is mediated via activation of the transcription factor hypoxia inducible factor 1 (HIF-1) and evaluated the role of mammalian target of rapamycin signaling in this process. METHODS: New Zealand White rabbits subjected to 40 min of regional myocardial ischemia, followed by 180 min of reperfusion, were assigned to the following groups: ischemia and reperfusion (I/R) only, isoflurane (1 minimal alveolar concentration) preconditioning, and isoflurane preconditioning in the presence of the mammalian target of rapamycin inhibitor rapamycin (0.25 mg/kg). Sham-operated, isoflurane + sham, rapamycin + sham, rapamycin + I/R, and dimethyl sulfoxide + I/R groups were also included. Creatine kinase-MB levels were assessed as an indicator of myocardial damage, and infarct size was evaluated by triphenyl tetrazolium chloride staining. HIF-1alpha expression and DNA binding were assessed by Western blotting and electrophoretic mobility shift analysis, respectively. RESULTS: Isoflurane preconditioning reduced infarct size compared with the I/R group: 26 +/- 4% versus 44 +/- 6% (P < 0.05). Creatine kinase-MB concentrations in the preconditioned animals (103 +/- 8% above baseline) were lower than in the I/R group (243 +/- 12% above baseline; P < 0.05). Rapamycin inhibited the cardioprotective effect of isoflurane: myocardial infarction increased to 44 +/- 4% and creatine kinase-MB level increased to 254 +/- 9% above baseline. HIF-1alpha protein expression and DNA binding activity increased after isoflurane preconditioning compared with the ischemia group. These effects were also inhibited by rapamycin. CONCLUSIONS: The current results indicate that isoflurane-induced myocardial protection involves activation of the HIF-1 pathway that is mediated by the mammalian target of rapamycin.
Authors:
Jacob Raphael; Zhiyi Zuo; Suzan Abedat; Ronen Beeri; Yaacov Gozal
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Anesthesiology     Volume:  108     ISSN:  1528-1175     ISO Abbreviation:  Anesthesiology     Publication Date:  2008 Mar 
Date Detail:
Created Date:  2008-02-22     Completed Date:  2008-03-12     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  1300217     Medline TA:  Anesthesiology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  415-25     Citation Subset:  AIM; IM    
Affiliation:
Department of Anesthesiology, University of Virginia Health Sciences System, Charlottesville, Virginia 22908, USA. jr5ef@virginia.edu
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MeSH Terms
Descriptor/Qualifier:
Animals
Hypoxia-Inducible Factor 1 / biosynthesis*,  genetics,  metabolism
Ischemic Preconditioning, Myocardial / methods*
Isoflurane / pharmacology,  therapeutic use*
Male
Myocardial Infarction / metabolism*,  prevention & control
Protein Kinases / genetics,  physiology*
Rabbits
Up-Regulation / drug effects,  physiology*
Chemical
Reg. No./Substance:
0/Hypoxia-Inducible Factor 1; 26675-46-7/Isoflurane; EC 2.7.-/Protein Kinases; EC 2.7.1.-/mTOR protein

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


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