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Thrombin-Mediated Degradation of Human Cardiac Troponin T

Ivan A Katrukha1,2, Alexander E Kogan3,2, Alexandra V Vylegzhanina3

  • 1HyTest Ltd., Turku, Finland; ivan.katrukha@hytest.fi.

Clinical Chemistry
|April 22, 2017
PubMed

Insights

Thrombin, not just μ-calpain, cleaves cardiac troponin T (cTnT) during serum preparation. This leads to a 29-kDa fragment in acute myocardial infarction (AMI) serum, impacting biomarker accuracy.

Area of Science:

  • Biochemistry
  • Cardiovascular Diagnostics
  • Proteomics

Background:

  • Cardiac troponin T (cTnT) is a key biomarker for acute myocardial infarction (AMI).
  • cTnT is susceptible to proteolytic degradation in serum, often attributed to μ-calpain.
  • The role of other proteases, like thrombin, in cTnT degradation during sample preparation is less understood.

Purpose of the Study:

  • To investigate the hypothesis that thrombin contributes to cTnT cleavage during serum sample preparation.
  • To identify the specific cleavage site and products of thrombin-mediated cTnT degradation.

Main Methods:

  • Immunoblotting and mass spectrometry (MS) were employed to analyze cTnT degradation.
  • Recombinant cTnT and native cardiac troponin complex were incubated with thrombin and normal human serum (NHS).
  • The effect of thrombin inhibition (hirudin) and sample matrix (heparin plasma) on cTnT stability was assessed.

Main Results:

  • Serum samples from AMI patients showed a predominant 29-kDa cTnT fragment, unlike plasma samples with full-sized cTnT (approx. 35 kDa).
  • Incubation with thrombin or NHS generated a 29-kDa cTnT fragment, mimicking serum findings.
  • MS analysis identified thrombin cleavage of cTnT between amino acid residues R68 and S69, yielding fragments aar 2-68 and 69-288.

Conclusions:

  • Thrombin is a significant protease responsible for generating the 29-kDa cTnT fragment observed in AMI serum.
  • This thrombin-mediated cleavage occurs during serum sample preparation, potentially affecting diagnostic accuracy.
  • Understanding this degradation pathway is crucial for reliable cTnT biomarker interpretation.
Abstract

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