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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

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1437-4331
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Volume 44, Issue 12

Issues

Interpretation of cardiac troponin T behaviour in size-exclusion chromatography

Etienne C.H.J. Michielsen
  • Department of Clinical Chemistry, University Hospital Maastricht, Maastricht, The Netherlands
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Jart H.C. Diris
  • Department of Clinical Chemistry, University Hospital Maastricht, Maastricht, The Netherlands
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Vincent W.V.C. Kleijnen
  • Department of Clinical Chemistry, University Hospital Maastricht, Maastricht, The Netherlands
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Will K.W.H. Wodzig
  • Department of Clinical Chemistry, University Hospital Maastricht, Maastricht, The Netherlands
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Marja P. Van Dieijen-Visser
  • Department of Clinical Chemistry, University Hospital Maastricht, Maastricht, The Netherlands
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2011-09-21 | DOI: https://doi.org/10.1515/CCLM.2006.265

Abstract

Background: Knowledge about the presence of intact cardiac troponin T (cTnT) and/or its immunoreactive fragments is of great value for the interpretation of cTnT clearance from the circulation. Until now there has been a lot of controversy about cTnT fragmentation. To provide an answer to this controversy, we investigated fragmentation of cTnT with size-exclusion chromatography (SEC), and confirmed our data using mass spectrometry.

Methods: A highly purified human cTnT standard, characterised using mass spectrometry as a single peak of 34,377 Da and using sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS-PAGE) as a single immunoreactive band (37 kDa), was incubated in serum for 0, 24 and 48h at 37°C and analysed using SEC. A troponin TIC complex standard, used in an earlier study, was also investigated.

Results: We demonstrated that, because of its rod-like shape, the molecular weight of cTnT cannot be estimated from SEC using the molecular weight of globular proteins as a reference. The Stokes radius of intact cTnT was calculated to be 33.7Å. Incubation of both cardiac troponin standards in troponin-free serum resulted in a time-dependent decrease in intact cTnT and a simultaneous increase in smaller immunoreactive fragments (13.4 and 22.4Å).

Conclusions: cTnT has a Stokes radius of 33.7Å. Compared with globular calibrator proteins, intact cTnT elutes earlier than expected based solely on its molecular weight. For non-globular or uncharacterised proteins, Stokes radii should be used for correct interpretation of SEC data. By doing so, we were able to clearly demonstrate cTnT fragments.

Clin Chem Lab Med 2006;44:1422–7.

Keywords: cardiac troponin T; mass spectrometry; SDS-PAGE; size-exclusion chromatography; Stokes radius

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About the article

Corresponding author: Prof. Dr. Marja P. Van Dieijen-Visser, Department of Clinical Chemistry, University Hospital Maastricht, P.O. Box 5800, 6202 AZ Maastricht, The Netherlands Phone: +31-43-74694, Fax: +31-43-3874692,


Received: 2006-07-10

Accepted: 2006-09-18

Published Online: 2011-09-21

Published in Print: 2006-12-01


Citation Information: Clinical Chemistry and Laboratory Medicine (CCLM), Volume 44, Issue 12, Pages 1422–1427, ISSN (Online) 1437-4331, ISSN (Print) 1434-6621, DOI: https://doi.org/10.1515/CCLM.2006.265.

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