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The effects of pantothenic acid, cysteine and dithiothreitol in intact, reperfused pig hearts

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Abstract

The objective of this study was to augment myocardial tissue levels of amphiphiles using a treatment protocol of pantothenic acid, cysteine and dithiothreitol (DTT) in 24hr fasted pigs and to test their influence on mechanical recovery in reperfusion. Eighteen pig hearts were extracorporeally perfused aerobically, subjected to regionally reversible ischemia in the left anterior descending perfusion system and reperfused. Nine hearts served as a placebo group; nine hearts were treated. All hearts received trace-labeled palmitate to measure fatty acid oxidation and were perfused with an infusion of 20% Intralipid to augment perfusate levels of fatty acids. Fasting alone in the presence of carbon substrates in the coronary perfusate was not sufficient to de-inhibit pantothenic acid kinase such that CoA synthesis was not enhanced. Tissue contents of triacylglycerols and phospholipids in reperfused myocardium were no different than in aerobic heart muscle but free CoA and free and total carnitine were reduced, suggesting a leakage of cytosolic contents across injured sarcolemma. Treatment significantly impaired mechanical recovery during reflow, presumable due to the noxious properties of DTT whose reported effects in heart muscle are wide ranging, difficult to predict in intact hearts and may be harmful.

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Authors and Affiliations

  1. Section of Cardiology, University of Wisconsin, 53792, Madison, WI, USA

    B. Renstrom, A. J. Liedtke, S. H. Nellis, C. R. Kidd, A. M. Eggleston, S. K. Rasmussen, D. K. Paulson & X. Q. Huang

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  1. B. Renstrom
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  2. A. J. Liedtke
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  3. S. H. Nellis
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  4. C. R. Kidd
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  5. A. M. Eggleston
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  6. S. K. Rasmussen
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  7. D. K. Paulson
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  8. X. Q. Huang
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Renstrom, B., Liedtke, A.J., Nellis, S.H. et al. The effects of pantothenic acid, cysteine and dithiothreitol in intact, reperfused pig hearts. Mol Cell Biochem 105, 27–35 (1991). https://doi.org/10.1007/BF00230372

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  • DOI: https://doi.org/10.1007/BF00230372

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