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Clinical Chemistry and Laboratory Medicine (CCLM)

Published in Association with the European Federation of Clinical Chemistry and Laboratory Medicine (EFLM)

Editor-in-Chief: Plebani, Mario

Ed. by Gillery, Philippe / Greaves, Ronda / Lackner, Karl J. / Lippi, Giuseppe / Melichar, Bohuslav / Payne, Deborah A. / Schlattmann, Peter


IMPACT FACTOR 2018: 3.638

CiteScore 2018: 2.44

SCImago Journal Rank (SJR) 2018: 1.191
Source Normalized Impact per Paper (SNIP) 2018: 1.205

Online
ISSN
1437-4331
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Volume 47, Issue 4

Issues

Determination of nitrotyrosine concentrations in plasma samples of diabetes mellitus patients by four different immunoassays leads to contradictive results and disqualifies the majority of the tests

Michael Safinowski / Birgit Wilhelm / Tanja Reimer / Alexander Weise / Nicole Thomé / Heike Hänel / Thomas Forst / Andreas Pfützner
Published Online: 2009-03-02 | DOI: https://doi.org/10.1515/CCLM.2009.095

Abstract

Background: In the course of type 2 diabetes mellitus, insulin resistance has a severe impact on endothelial function leading to decreased synthesis of nitric oxide (NO). Postprandial hyperglycemia leads to the generation of reactive oxygen species, which counteracts the beneficial NO effects. NO and superoxide combine very fast in solution to form peroxynitrite, which is a potent protein-oxidizing agent. The peroxynitrite concentrations can be indirectly monitored by the detection of nitrotyrosine residues in proteins, reflecting the extent of damage caused by oxidative stress.

Methods: Four commercially available nitrotyrosine-specific immunoassays were evaluated by parallel measurement of nitrotyrosine in 224 serum samples derived from 16 patients with type 2 diabetes and 12 healthy controls (13 male and 15 female, age: 33±11 years) following a standardized meal.

Results: The available ELISA tests were not applicable for nitrotyrosine determination in human plasma samples due to technical issues and implausible results. However, a competitive luminescence assay was able to provide sufficient sensitivity and lead to clinically meaningful results in our test samples.

Conclusions: All three ELISA methods were disqualified and conclusions previously derived from clinical experiments using these tests should be carefully reconsidered or reconfirmed. In the absence of a liquid tandem chromatography-mass spectrometry reference method, the luminescence test appears to be the method of choice for determination of nitrotyrosine in human plasma.

Clin Chem Lab Med 2009;47:483–8.

Keywords: atherosclerosis; nitrotyrosine; oxidative stress; test evaluation

About the article

Corresponding author: Prof. Dr. Dr. Andreas Pfützner, IKFE GmbH, Parcusstr. 8, 55116 Mainz, Germany Phone: +49-6131-576-3613, Fax: +49-6131-576-3611,


Received: 2008-10-20

Accepted: 2009-01-05

Published Online: 2009-03-02

Published in Print: 2009-04-01


Citation Information: Clinical Chemistry and Laboratory Medicine, Volume 47, Issue 4, Pages 483–488, ISSN (Online) 1437-4331, ISSN (Print) 1434-6621, DOI: https://doi.org/10.1515/CCLM.2009.095.

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