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Publication Detail
Signalling via the reperfusion injury signalling kinase (RISK) pathway links closure of the mitochondrial permeability transition pore to cardioprotection
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Davidson SM, Hausenloy D, Duchen MR, Yellon DM
  • Publication date:
    03/2006
  • Pagination:
    414, 419
  • Journal:
    The International Journal of Biochemistry and Cell Biology
  • Volume:
    38
  • Issue:
    3
  • Print ISSN:
    1357-2725
  • Keywords:
    Int J Biochem Cell Biol. 2006 Mar;38(3):414-9. Epub 2005 Oct 21., 1-Phosphatidylinositol 3-Kinase, Animals, Cardiotonic Agents, Cell Line, Cell Membrane Permeability, cytology, Enzyme Activation, Enzyme Inhibitors, Extracellular Signal-Regulated MAP Kinases, Male, metabolism, Mitochondria, Myocytes, Cardiac, Nitric Oxide, Oxidative Stress, physiology, prevention & control, Proto-Oncogene Proteins c-akt, Rats, Sprague-Dawley, Reperfusion Injury, Signal Transduction, ultrastructure
  • Addresses:
    The Hatter Cardiovascular Institute, University College London Hospitals and Medical School, London, UK
  • Notes:
    Imported from PubMed 02/05/2006, 9
Abstract
Post-ischemic interventions that activate phosphatidylinositol-3-OH kinase (PI3K)-Akt or ERK1/2 pro-survival kinases (the so-called \"reperfusion injury signalling kinase (RISK) pathway\") during the first few minutes of reperfusion protect against lethal reperfusion-induced injury. We have previously shown that insulin protects against reperfusion-induced injury via activation of the PI3K-Akt pathway. In addition, opening of the mitochondrial permeability transition pore (mPTP) at the time of reperfusion is a major determinant of lethal reperfusion-induced injury, and pharmacologically inhibiting it is cardioprotective. In this study, we examined the relationship between the pro-survival kinase pathways and mPTP opening. Specifically, we tested the hypothesis that activation of the pro-survival kinase pathway by insulin protects cardiomyocytes by reducing the probability of mPTP opening upon reperfusion. Laser illumination of the fluorophore, tetramethyl rhodamine methyl ester (TMRM), was used to induce oxidative stress in the preparation of adult rat ventricular cardiomyocytes. Maintained illumination ultimately induces mPTP opening, detected as a global mitochondrial depolarization, followed by ATP depletion and rigor contracture. Insulin significantly delayed mPTP opening by a factor of approximately 1.7-fold (P<0.001). The effect of insulin was prevented by Wortmannin and by LY-294002, inhibitors of the PI3K pathway, by SH-6, a selective inhibitor of Akt, and by L-NAME, an inhibitor of nitric oxide production. The expression of a dominant negative construct of Akt eliminated the effect of insulin in delaying mPTP opening in a cardiac cell line. Furthermore, the overexpression of constitutively active Akt was sufficient to maximally delay mPTP opening. These results indicate that activation of the PI3K-Akt pro-survival kinase pathway inhibits opening of the mPTP, and demonstrate an important link between the survival kinases and the mPTP
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