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  • Title: Propofol post-conditioning protects against cardiomyocyte apoptosis in hypoxia/reoxygenation injury by suppressing nuclear factor-kappa B translocation via extracellular signal-regulated kinase mitogen-activated protein kinase pathway.
    Author: Li H, Tan J, Zou Z, Huang CG, Shi XY.
    Journal: Eur J Anaesthesiol; 2011 Jul; 28(7):525-34. PubMed ID: 21666544.
    Abstract:
    BACKGROUND AND OBJECTIVE: Perioperative myocardial ischaemia leads to an exceedingly high mortality. Previous studies have indicated that propofol pre-conditioning could mimic the cardioprotective effects of ischaemic pre-conditioning. The purpose of this study was to determine whether propofol post-conditioning is cardioprotective and to explore the possible molecular mechanism of propofol post-conditioning. METHODS: Primary cultured neonatal rat cardiomyocytes were exposed to 12 h of hypoxia followed by 4 h of reoxygenation (H/R) and post-conditioned by different concentrations of propofol at the onset of reperfusion with and without a specific inhibitor of extracellular signal-regulated kinases (ERKs). Cell apoptosis and the generation of intracellular reactive oxygen species were measured using FACScalibur flow cytometric analysis. ERK1/2 phosphorylation and nuclear factor-kappa B (NF-κB) translocation were determined by western blot and immunofluorescence, respectively. RESULTS: Propofol post-conditioning enhanced cell viability (86.6 ± 6.5 versus 64.1 ± 3.4%) and reduced apoptosis (3.6 ± 0.4 versus 12.5 ± 2.1%) to protect cardiomyocytes against H/R injury. Meanwhile, propofol post-conditioning stimulated expression of phosphor-ERKs. H/R markedly induced p65 NF-κB nuclear translocation in cardiomyocytes, whereas propofol post-conditioning significantly suppressed H/R-primed NF-κB translocation. Moreover, addition of the mitogen-activated protein kinase kinase 1 inhibitor U0126 into cardiomyocytes 30 min before H/R eliminated the cardioprotection of propofol post-conditioning. CONCLUSION: Propofol exerts cardioprotection when administered at the early phase of reperfusion. The effect is mediated through decrease in cardiomyocyte apoptosis and NF-κB nucleus translocation potentially via ERK signalling pathways.
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