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Carbon Monoxide Pollution Impairs Myocardial Perfusion Reserve: Implication of Coronary Endothelial Dysfunction

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Abstract

Chronic exposure to simulated urban CO pollution is reported to be associated with cardiac dysfunction. Despite the potential implication of myocardial perfusion alteration in the pathophysiology of CO pollution, the underlying mechanisms remain today still unknown. Therefore, the aim of this work was to evaluate the effects of prolonged exposure to simulated urban CO pollution on the regulation of myocardial perfusion. Cardiac hemodynamics and myocardial perfusion were assessed under basal conditions and during the infusion of a β-Adrenergic agonist. The effects of CO exposure on capillary density, coronary endothelium-dependent vasodilatation, eNOS expression and eNOS uncoupling were also evaluated. Our main results were that prolonged CO exposure was associated with a blunted myocardial perfusion response to a physiological stress responsible for an altered contractile reserve. The impairment of myocardial perfusion reserve was not accounted for a reduced capillary density but rather by an alteration in coronary endothelium-dependent vasorelaxation (−45% of maximal relaxation to ACh). In addition, though chronic CO exposure did not change eNOS expression, it significantly increased eNOS uncoupling. Therefore, the present work underlines the fact that chronic CO exposure, at levels found in urban air pollution, is associated with reduced myocardial perfusion reserve. This phenomenon is explained at the coronary-vessel level by deleterious effects of CO exposure on the endothelium NO-dependent vasorelaxation via eNOS uncoupling.

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Authors and Affiliations

  1. EA4278, Faculty of Sciences, Avignon University, Avignon, France

    G. Meyer, J. Boissiere, S. Tanguy, S. Gayrard, P. Obert & C. Reboul

  2. EA3127, GRH, IURC, Montpellier I University, Montpellier, France

    C. Rugale & B. Jover

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  1. G. Meyer
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  2. J. Boissiere
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  3. S. Tanguy
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Correspondence to C. Reboul.

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Meyer, G., Boissiere, J., Tanguy, S. et al. Carbon Monoxide Pollution Impairs Myocardial Perfusion Reserve: Implication of Coronary Endothelial Dysfunction. Cardiovasc Toxicol 11, 334–340 (2011). https://doi.org/10.1007/s12012-011-9125-z

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  • DOI: https://doi.org/10.1007/s12012-011-9125-z

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