Abstract
Objective
Decreased diaphragmatic contractility and organ failure observed during sepsis is mediated by an overproduction of nitric oxide (.NO)-derived species, mitochondria being a major target of oxidative and nitrative stress. We tested the potential protective effects of (a) a novel synthetic antioxidant, the manganese(III) 5,10,15,20-tetrakis(N-ethylpyridinium-2-yl) porphyrin (MnTE-2-PyP5+) and (b) the inducible .NO synthase inhibitor aminoguanidine (AG) on a rat model of sepsis.
Setting
University research laboratories.
Subjects and interventions
Sepsis was induced by cecal ligation and perforation in rats.
Measurements and results
Systemic hemodynamics, pulmonary gas exchange, in vitro diaphragmatic function and mitochondrial respiration were evaluated. Moreover, plasma and mitochondrial oxidative and nitrative stress parameters were investigated. Sepsis determined diaphragmatic dysfunction and a significant decrease in mitochondrial coupling and respiration. Oxidative stress was evidenced by decreased plasma antioxidants and increased lipid oxidation. Tyrosine nitration was increased in the plasma and mitochondria of the septic animals. These alterations were ameliorated or prevented by either MnTE-2-PyP5+ or AG.
Conclusions
Our results demonstrate that overproduction of .NO and .NO-derived reactive species play a critical role in mitochondrial impairment and diaphragmatic function during sepsis. More importantly, AG but mainly the novel metalloporphyrin MnTE-2-PyP5+ were able to ameliorate diaphragmatic and mitochondrial dysfunction and could contribute to preventing organ failure during severe sepsis.
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Acknowledgements
We thank Ines Batinic-Haberle from Duke University for providing the MnTE-2-PyP5+.
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This work was supported in part by FOGARTY-NIH, Wellcome Trust and Guggenheim Foundation for Homero Rubbo and Rafael Radi, and the Howard Hughes Medical Institute for Rafael Radi, and by PRONBIO, Fundación Manuel Pérez for Nicolás Nin.
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Nin, N., Cassina, A., Boggia, J. et al. Septic diaphragmatic dysfunction is prevented by Mn(III)porphyrin therapy and inducible nitric oxide synthase inhibition. Intensive Care Med 30, 2271–2278 (2004). https://doi.org/10.1007/s00134-004-2427-x
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DOI: https://doi.org/10.1007/s00134-004-2427-x