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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
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1437-4331
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Volume 47, Issue 6

Issues

Proteomics of exhaled breath: methodological nuances and pitfalls

Viktoria S. Kurova / Eldar C. Anaev / Alexey S. Kononikhin / Kristina Yu. Fedorchenko / Igor A. Popov / Timothey L. Kalupov / Dmitriy O. Bratanov / Eugenie N. Nikolaev / Sergey D. Varfolomeev

Abstract

Background: The analysis of exhaled breath condensate (EBC) can be an alternative to traditional endoscopic sampling of lower respiratory tract secretions. This is a simple non-invasive method of diagnosing respiratory diseases, in particular, respiratory inflammatory processes.

Methods: Samples were collected with a special device-condenser (ECoScreen, VIASYS Healthcare, Germany), then treated with trypsin according to the proteomics protocol for standard protein mixtures and analyzed by nanoflow high-performance liquid chromatography tandem mass spectrometry (HPLC-MS/MS) with a 7-Tesla Finnigan LTQ-FT mass spectrometer (Thermo Electron, Germany). Mascot software (Matrixscience) was used for screening the database NCBInr for proteins corresponding to the peptide maps that were obtained.

Results: EBCs from 17 young healthy non-smoking donors were collected. Different methods for concentrating protein were compared in order to optimize EBC preparations for proteomic analysis. The procedure that was chosen allowed identification of proteins exhaled by healthy people. The major proteins in the condensates were cytoskeletal keratins. Another 12 proteins were identified in EBC from healthy non-smokers. Some keratins were found in the ambient air and may be considered exogenous components of exhaled air.

Conclusions: Knowledge of the normal proteome of exhaled breath allows one to look for biomarkers of different disease states in EBC. Proteins in ambient air can be identified in the respiratory tract and should be excluded from the analysis of the proteome of EBC. The results obtained allowed us to choose the most effective procedure of sample preparation when working with samples containing very low protein concentrations.

Clin Chem Lab Med 2009;47:706–12.

Keywords: exhaled breath condensate (EBC); nanoflow HPLC-tandem mass spectrometry; proteomics

About the article

Corresponding author: Dr. Viktoria Kurova, N.M. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, 4/11 Kosygin Street, 119334 Moscow, Russian Federation Fax: +7 495 137 41 01,


Received: 2008-11-26

Accepted: 2009-04-21

Published in Print: 2009-06-01


Citation Information: Clinical Chemistry and Laboratory Medicine, Volume 47, Issue 6, Pages 706–712, ISSN (Online) 1437-4331, ISSN (Print) 1434-6621, DOI: https://doi.org/10.1515/CCLM.2009.166.

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