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Critical Care
Published in: Critical Care 1/2017

Open Access 01-12-2017 | Research

Markers of nitric oxide are associated with sepsis severity: an observational study

Authors: Martin Sebastian Winkler, Stefan Kluge, Maximilian Holzmann, Eileen Moritz, Linda Robbe, Antonia Bauer, Corinne Zahrte, Marion Priefler, Edzard Schwedhelm, Rainer H. Böger, Alwin E. Goetz, Axel Nierhaus, Christian Zoellner

Published in: Critical Care | Issue 1/2017

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Abstract

Background

Nitric oxide (NO) regulates processes involved in sepsis progression, including vascular function and pathogen defense. Direct NO measurement in patients is unfeasible because of its short half-life. Surrogate markers for NO bioavailability are substrates of NO generating synthase (NOS): L-arginine (lArg) and homoarginine (hArg) together with the inhibitory competitive substrate asymmetric dimethylarginine (ADMA). In immune cells ADMA is cleaved by dimethylarginine-dimethylaminohydrolase-2 (DDAH2). The aim of this study was to investigate whether concentrations of surrogate markers for NO bioavailability are associated with sepsis severity.

Method

This single-center, prospective study involved 25 controls and 100 patients with surgical trauma (n = 20), sepsis (n = 63), or septic shock (n = 17) according to the Sepsis-3 definition. Plasma lArg, hArg, and ADMA concentrations were measured by mass spectrometry and peripheral blood mononuclear cells (PBMCs) were analyzed for DDAH2 expression.

Results

lArg concentrations did not differ between groups. Median (IQR) hArg concentrations were significantly lower in patient groups than controls, being 1.89 (1.30–2.29) μmol/L (P < 0.01), with the greatest difference in the septic shock group, being 0.74 (0.36–1.44) μmol/L. In contrast median ADMA concentrations were significantly higher in patient groups compared to controls, being 0.57 (0.46–0.65) μmol/L (P < 0.01), with the highest levels in the septic shock group, being 0.89 (0.56–1.39) μmol/L. The ratio of hArg:ADMA was inversely correlated with disease severity as determined by the Sequential Organ Failure Assessment (SOFA) score. Receiver-operating characteristic analysis for the presence or absence of septic shock revealed equally high sensitivity and specificity for the hArg:ADMA ratio compared to the SOFA score. DDAH2 expression was lower in patients than controls and lowest in the subgroup of patients with increasing SOFA.

Conclusions

In patients with sepsis, plasma hArg concentrations are decreased and ADMA concentrations are increased. Both metabolites affect NO metabolism and our findings suggest reduced NO bioavailability in sepsis. In addition, reduced expression of DDAH2 in immune cells was observed and may not only contribute to blunted NO signaling but also to subsequent impaired pathogen defense.
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Metadata
Title
Markers of nitric oxide are associated with sepsis severity: an observational study
Authors
Martin Sebastian Winkler
Stefan Kluge
Maximilian Holzmann
Eileen Moritz
Linda Robbe
Antonia Bauer
Corinne Zahrte
Marion Priefler
Edzard Schwedhelm
Rainer H. Böger
Alwin E. Goetz
Axel Nierhaus
Christian Zoellner
Publication date
01-12-2017
Publisher
BioMed Central
Published in
Critical Care / Issue 1/2017
Electronic ISSN: 1364-8535
DOI
https://doi.org/10.1186/s13054-017-1782-2

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