Inhibition of apoptotic protein p53 lowers the threshold of isoflurane-induced cardioprotection during early reperfusion in rabbits.

Abstract:

INTRODUCTION:Exposure to isoflurane before and during early reperfusion protects against myocardial infarction by activating phosphatidylinositol-3-kinase (PI3K)-mediated signaling. The apoptotic protein, p53, is regulated by PI3K, and inhibition of p53 protects against ischemic injury. We tested the hypothesis that p53 inhibition lowers the threshold of isoflurane-induced postconditioning in vivo. METHODS:Rabbits (n = 73) instrumented for hemodynamic measurement and subjected to a 30-min left anterior descending coronary artery occlusion and 3-h reperfusion received 0.9% saline (control), isoflurane (0.5 or 1.0 minimum alveolar concentration [MAC]) administered for 3 min before and 2 min after reperfusion, the p53 inhibitor pifithrin-alpha (1.5 or 3.0 mg/kg), or 0.5 MAC isoflurane plus 1.5 mg/kg pifithrin-alpha. Other rabbits received 3.0 mg/kg pifithrin-alpha or 0.5 MAC isoflurane plus 1.5 mg/kg pifithrin-alpha after pretreatment with the selective PI3K inhibitor wortmannin (0.6 mg/kg) or the mitochondrial permeability transition pore opener atractyloside (5 mg/kg). RESULTS:Isoflurane (1.0 but not 0.5 MAC), pifithrin-alpha (3.0 but not 1.5 mg/kg), and the combination of 0.5 MAC isoflurane plus 1.5 mg/kg pifithrin-alpha significantly (P < 0.05) reduced infarct size (21% +/- 4%, 43% +/- 7%, 22% +/- 4%, 45% +/- 4%, and 28% +/- 3% [mean +/- sd], respectively, of left ventricular area at risk; triphenyltetrazolium chloride staining) when compared with control (45% +/- 2%). Atractyloside, but not wortmannin, abolished 3.0 mg/kg pifithrin-alpha-induced cardioprotection, whereas atractyloside and wortmannin blocked reductions in infarct size produced by 0.5 MAC isoflurane plus 1.5 mg/kg pifithrin-alpha. CONCLUSION:The results indicate that inhibition of the apoptotic protein p53 lowers the threshold of isoflurane-induced cardioprotection during early reperfusion in vivo.

journal_name

Anesth Analg

journal_title

Anesthesia and analgesia

authors

Venkatapuram S,Wang C,Krolikowski JG,Weihrauch D,Kersten JR,Warltier DC,Pratt PF Jr,Pagel PS

doi

10.1213/01.ane.0000240903.63832.d8e

subject

Has Abstract

pub_date

2006-12-01 00:00:00

pages

1400-5

issue

6

eissn

0003-2999

issn

1526-7598

pii

103/6/1400

journal_volume

103

pub_type

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