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    The novel adipocytokine visfatin exerts direct cardioprotective effects.

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    119
    Author
    Lim, SY; Davidson, SM; Paramanathan, AJ; Smith, CCT; Yellon, DM; Hausenloy, DJ
    Date
    2008-08
    Source Title
    Journal of Cellular and Molecular Medicine
    Publisher
    Wiley
    University of Melbourne Author/s
    Lim, Shiang
    Affiliation
    Surgery (St Vincent's)
    Metadata
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    Document Type
    Journal Article
    Citations
    Lim, S. Y., Davidson, S. M., Paramanathan, A. J., Smith, C. C. T., Yellon, D. M. & Hausenloy, D. J. (2008). The novel adipocytokine visfatin exerts direct cardioprotective effects.. J Cell Mol Med, 12 (4), pp.1395-1403. https://doi.org/10.1111/j.1582-4934.2008.00332.x.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/259203
    DOI
    10.1111/j.1582-4934.2008.00332.x
    Open Access at PMC
    http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2905617
    Abstract
    Visfatin is an adipocytokine capable of mimicking the glucose-lowering effects of insulin and activating the pro-survival kinases phosphatidylinositol-3-OH kinase (PI3K)-protein kinase B (Akt) and mitogen-activated protein kinase kinase 1 and 2 (MEK1/2)-extracellular signal-regulated kinase 1 and 2 (Erk 1/2). Experimental studies have demonstrated that the activation of these kinases confers cardioprotection through the inhibition of the mitochondrial permeability transition pore (mPTP). Whether visfatin is capable of exerting direct cardioprotective effects through these mechanisms is unknown and is the subject of the current study. Anaesthetized C57BL/6 male mice were subjected to in situ 30 min. of regional myocardial ischaemia and 120 min. of reperfusion. The administration of an intravenous bolus of visfatin (5 x 10(-6) micromol) at the time of myocardial reperfusion reduced the myocardial infarct size from 46.1+/-4.1% in control hearts to 27.3+/-4.0% (n>or= 6/group, P<0.05), an effect that was blocked by the PI3K inhibitor, wortmannin, and the MEK1/2 inhibitor, U0126 (48.8+/-5.5% and 45.9+/-8.4%, respectively, versus 27.3+/-4.0% with visfatin; n>or= 6/group, P<0.05). In murine ventricular cardiomyocytes subjected to 30 min. of hypoxia followed by 30 min. of reoxygenation, visfatin (100 ng/ml), administered at the time of reoxygenation, reduced the cell death from 65.2+/-4.6% in control to 49.2+/-3.7%(n>200 cells/group, P<0.05), an effect that was abrogated by wortmannin and U0126 (68.1+/-5.2% and 59.7+/-6.2%, respectively; n>200 cells/group, P>0.05). Finally, the treatment of murine ventricular cardiomyocytes with visfatin (100 ng/ml) delayed the opening of the mPTP induced by oxidative stress from 81.2+/-4 sec. in control to 120+/-7 sec. (n>20 cells/group, P<0.05) in a PI3K- and MEK1/2-dependent manner. We report that the adipocytokine, visfatin, is capable of reducing myocardial injury when administered at the time of myocardial reperfusion in both the in situ murine heart and the isolated murine cardiomyocytes. The mechanism appears to involve the PI3K and MEK1/2 pathways and the mPTP.

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