Pyruvate augments mechanical function via activation of the pyruvate dehydrogenase complex in reperfused ischemic immature rabbit hearts

Yoshikatsu Saiki, Gary D. Lopaschuk, Karen Dodge, Kazuhiro Yamaya, Catherine Morgan, Ivan M. Rebeyka

研究成果: Article査読

16 被引用数 (Scopus)

抄録

Background. Reperfusion of ischemic adult hearts is associated with increased fatty acid oxidation, reduced pyruvate oxidation, and reduced pyruvate dehydrogenase (PDH) activity, leading to a decrease in cardiac efficiency. These effects may be amplified in newborn hearts because of the immaturity of their PDH pathway. We hypothesize that pyruvate can augment mechanical function in the immature heart by activating the PDH complex (PDC) during reperfusion in severely ischemic hearts. Materials and methods. Seven- day old isolated working rabbit hearts (n = 12) were perfused with modified Krebs solution containing 0.4 mM palmitate. Pyruvate (5 mM) was added for a 10-min period either before or after a 30-min period of normothermic global ischemia. Cardiac functional indices before global ischemia and during reperfusion were correlated with active and total PDC activity measured in 28 additional hearts frozen at the various time points throughout the perfusion protocol. Results. Addition of pyruvate before ischemia increased the proportion of active PDC but did not affect any measured functional indices. During early reperfusion, aortic flow, cardiac output, and cardiac work were all significantly depressed compared to preischemic values. Addition of pyruvate significantly increased the proportion of active PDC and was also associated with a significant increase in aortic flow, cardiac work, and developed pressure. Removal of pyruvate from the perfusate resulted in a subsequent significant decrease in PDC activity and these functional parameters. Conclusion. During reperfusion of neonatal rabbit hearts, addition of pyruvate improves cardiac performance in association with activation of PDC.

本文言語English
ページ(範囲)164-169
ページ数6
ジャーナルJournal of Surgical Research
79
2
DOI
出版ステータスPublished - 1998 10
外部発表はい

ASJC Scopus subject areas

  • Surgery

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