QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text Full Text (PDF) All Versions of this Article: jpet.105.100537v1 318/1/186    most recent Submit a response Alert me when this article is cited Alert me when eLetters are posted Alert me if a correction is posted Citation Map Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Raphael, J. Articles by Gozal, Y. Search for Related Content PubMed PubMed Citation Articles by Raphael, J. Articles by Gozal, Y.

CARDIOVASCULAR

Volatile Anesthetic Preconditioning Attenuates Myocardial Apoptosis in Rabbits after Regional Ischemia and Reperfusion via Akt Signaling and Modulation of Bcl-2 Family Proteins

Departments of Anesthesiology and Critical Care Medicine (J.Ra., J.Ri., Y.G.), the Heart Institute (S.A., R.B., T.P.) and Pathology (K.M.), Hebrew University, Hadassah Medical Center, Jerusalem, Israel; and Department of Anesthesiology (J.Ra., Z.Z.) University of Virginia, Charlottesville, Virginia

We tested whether isoflurane preconditioning inhibits cardiomyocyte apoptosis and evaluated the role of the phosphatidylinositol-3-kinase (PI3K)/Akt pathway in anesthetic preconditioning and determined whether PI3K/Akt signaling modulates the expression of pro- and antiapoptotic proteins in anesthetic preconditioning. Six-month-old New Zealand rabbits subjected to 40 min of myocardial ischemia followed by 180 min of reperfusion were assigned to the following groups: ischemia-reperfusion (I/R), isoflurane preconditioning and isoflurane plus PI3K inhibitors, wortmannin and 2-(4-morpholinyl)-8-phenyl-4H-L-benzopyran-4-one (LY294002) (0.6 and 0.3 mg/kg i.v., respectively). Sham-operated, wortmannin + I/R, wortmannin + sham, LY294002 + I/R, and LY294002 + sham groups were also included. Infarct size was assessed by triphenyltetrazolium chloride staining. Apoptosis was evaluated by terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling and activated caspase-3 assays. Akt phosphorylation, Bax, Bcl-2, Bad, and phosphorylated Bad (phospho-Bad) expression was assessed by immunoblotting. Isoflurane preconditioning reduced infarct size compared with the I/R group: 22 ± 4 versus 41 ± 5% (p < 0.05). The percentage of apoptotic cells decreased in the isoflurane group (3.8 ± 1.2%) compared with the I/R group (12.4 ± 1.6%; p < 0.05). These results were also confirmed by the activated caspase-3 assay. Wortmannin and LY294002 inhibited the effects of isoflurane. Myocardial infarction increased to 44 ± 3 and 45 ± 2% and the percentage of apoptotic cells was 11.9 ± 2.1 and 11.7 ± 3.3%, respectively. Akt phosphorylation and Bcl-2 and phospho-Bad expression increased after isoflurane preconditioning, whereas Bax expression decreased. These effects were inhibited by wortmannin and LY294002. The data indicate that isoflurane preconditioning reduces infarct size and myocardial apoptosis after I/R. Activation of PI3K and modulation of the expression of pro- and antiapoptotic proteins may play a role in isoflurane-induced myocardial protection.

Address correspondence to: Dr. Jacob Raphael, Department of Anesthesiology, University of Virginia Health System, Box 800710, Charlottesville, VA 22908-0710. E-mail: jr5ef{at}virginia.edu

This article has been cited by other articles:

				P. S. Pagel Induction of Heat Shock Protein 70 and Preconditioning by Sevoflurane: A Potent Protective Interaction Against Myocardial Ischemia-Reperfusion Injury Anesth. Analg., September 1, 2008; 107(3): 742 - 745. [Full Text] [PDF]

				D. K. Singla, R. D. Singla, and D. E. McDonald Factors released from embryonic stem cells inhibit apoptosis in H9c2 cells through PI3K/Akt but not ERK pathway Am J Physiol Heart Circ Physiol, August 1, 2008; 295(2): H907 - H913. [Abstract] [Full Text] [PDF]