Levosimendan affects oxidative and inflammatory pathways in the diaphragm of ventilated endotoxemic mice

Willem Jan M. Schellekens, Hieronymus W.H. van Hees, Marianne Linkels, P. N.Richard Dekhuijzen, Gert Jan Scheffer, Johannes G. van der Hoeven, Leo M.A. Heunks*

*Corresponding author for this work

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Abstract

Introduction: Controlled mechanical ventilation and endotoxemia are associated with diaphragm muscle atrophy and dysfunction. Oxidative stress and activation of inflammatory pathways are involved in the pathogenesis of diaphragmatic dysfunction. Levosimendan, a cardiac inotrope, has been reported to possess anti-oxidative and anti-inflammatory properties. The aim of the present study was to investigate the effects of levosimendan on markers for diaphragm nitrosative and oxidative stress, inflammation and proteolysis in a mouse model of endotoxemia and mechanical ventilation. Methods: Three groups were studied: (1) unventilated mice (CON, n =8), (2) mechanically ventilated endotoxemic mice (MV LPS, n =17) and (3) mechanically ventilated endotoxemic mice treated with levosimendan (MV LPS + L, n =17). Immediately after anesthesia (CON) or after 8 hours of mechanical ventilation, blood and diaphragm muscle were harvested for biochemical analysis. Results: Mechanical ventilation and endotoxemia increased expression of inducible nitric oxide synthase (iNOS) mRNA and cytokine levels of interleukin (IL)-1β, IL-6 and keratinocyte-derived chemokine, and decreased IL-10, in the diaphragm; however, they had no effect on protein nitrosylation and 4-hydroxy-2-nonenal protein concentrations. Levosimendan decreased nitrosylated proteins by 10% (P <0.05) and 4-hydroxy-2-nonenal protein concentrations by 13% (P <0.05), but it augmented the rise of iNOS mRNA by 47% (P <0.05). Levosimendan did not affect the inflammatory response in the diaphragm induced by mechanical ventilation and endotoxemia. Conclusions: Mechanical ventilation in combination with endotoxemia results in systemic and diaphragmatic inflammation. Levosimendan partly decreased markers of nitrosative and oxidative stress, but did not affect the inflammatory response.

Original languageEnglish
Article number69
JournalCritical Care
Volume19
Issue number1
DOIs
Publication statusPublished - 14 Dec 2015

Cite this

Schellekens, W. J. M., van Hees, H. W. H., Linkels, M., Dekhuijzen, P. N. R., Scheffer, G. J., van der Hoeven, J. G., & Heunks, L. M. A. (2015). Levosimendan affects oxidative and inflammatory pathways in the diaphragm of ventilated endotoxemic mice. Critical Care, 19(1), [69]. https://doi.org/10.1186/s13054-015-0798-8