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Opening of mitochondrial ATP-sensitive potassium channels enhances cardioplegic protection

The Annals of thoracic surgery, 2001-04, Vol.71 (4), p.1281-1288 [Peer Reviewed Journal]

2001 The Society of Thoracic Surgeons ;ISSN: 0003-4975 ;EISSN: 1552-6259 ;DOI: 10.1016/S0003-4975(00)02667-9 ;PMID: 11308175

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  • Title:
    Opening of mitochondrial ATP-sensitive potassium channels enhances cardioplegic protection
  • Author: Toyoda, Yoshiya ; Levitsky, Sidney ; McCully, James D
  • Subjects: Adenosine Triphosphate - physiology ; Analysis of Variance ; Animals ; Cardioplegic Solutions - pharmacology ; Diazoxide - pharmacology ; Disease Models, Animal ; Heart Arrest, Induced - methods ; Mitochondria - physiology ; Myocardial Infarction - prevention & control ; Myocardial Ischemia - drug therapy ; Myocardial Reperfusion - methods ; Potassium Channels - drug effects ; Probability ; Rabbits ; Sensitivity and Specificity
  • Is Part Of: The Annals of thoracic surgery, 2001-04, Vol.71 (4), p.1281-1288
  • Description: Background. Mitochondrial and sarcolemmal ATP-sensitive potassium channels have been implicated in cardioprotection; however, the role of these channels in magnesium-supplemented potassium (K/Mg) cardioplegia during ischemia or reperfusion is unknown. Methods. Rabbit hearts (n = 76) were used for Langendorff perfusion. Sham hearts were perfused for 180 minutes. Global ischemia hearts received 30 minutes of global ischemia and 120 minutes of reperfusion. K/Mg hearts received cardioplegia before ischemia. The role of ATP-sensitive potassium channels in K/Mg cardioprotection during ischemia and reperfusion was investigated, separately using the selective mitochondrial ATP sensitive potassium and channel blocker, 5-hydroxydecanoate, and the selective sarcolemmal ATP-sensitive potassium channel blocker HMR1883. Separate studies were performed using the selective mitochondrial ATP-sensitive potassium channel opener, diazoxide, and the nonselective ATP-sensitive potassium channel opener pinacidil. Results. Infarct size was 1.9% ± 0.4% in sham, 3.7% ± 0.5% in K/Mg, and 27.8% ± 2.4% in global ischemia hearts ( p < 0.05 versus K/Mg). Left ventricular peak-developed pressure (percent of equilibrium) at the end of 120 minutes of reperfusion was 91% ± 6% in sham, 92% ± 2% in K/Mg, and 47% ± 6% in global ischemia ( p < 0.05 versus K/Mg). Blockade of sarcolemmal ATP-sensitive potassium channels in K/Mg hearts had no effect on infarct size or left ventricular peak-developed pressure. However, blockade of mitochondrial ATP-sensitive potassium channels before ischemia significantly increased infarct size to 23% ± 2% in K/Mg hearts ( p < 0.05 versus K/Mg; no statistical significance [NS] as compared to global ischemia) and significantly decreased left ventricular peak-developed pressure to 69% ± 4% ( p < 0.05 versus K/Mg). Diazoxide when added to K/Mg cardioplegia significantly decreased infarct size to 1.5% ± 0.4% ( p < 0.05 versus K/Mg). Conclusions. The cardioprotection afforded by K/Mg cardioplegia is modulated by mitochondrial ATP-sensitive potassium channels. Diazoxide when added to K/Mg cardioplegia significantly reduces infarct size, suggesting that the opening of mitochondrial ATP-sensitive potassium channels with K/Mg cardioplegic protection would allow for enhanced myocardial protection in cardiac operations.
  • Publisher: Netherlands: Elsevier Inc
  • Language: English
  • Identifier: ISSN: 0003-4975
    EISSN: 1552-6259
    DOI: 10.1016/S0003-4975(00)02667-9
    PMID: 11308175
  • Source: GFMER Free Medical Journals
    MEDLINE
    Alma/SFX Local Collection
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