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Diagnosing acute coronary syndrome or ACS begins with a thorough patient history. Notable symptoms include central, crushing chest pain radiating to the left arm, neck, jaw, or back, along with shortness of breath, sweating (diaphoresis), nausea, vomiting, dizziness, and palpitations.It is crucial to note any history of cardiac illnesses and assess risk factors, including age, gender, smoking, hypertension, diabetes, hyperlipidemia, and a sedentary lifestyle.During physical examination, vital...
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Cardiac troponin in ischemic cardiomyocytes: intracellular decrease before onset of cell death.

Alexander S Streng1, Leo H J Jacobs1, Robert W Schwenk2

  • 1Department of Clinical Chemistry, Maastricht University Medical Centre, Maastricht, The Netherlands.

Experimental and Molecular Pathology
|March 11, 2014
PubMed
Summary

Cardiac troponin (cTn) is not released from viable cardiomyocytes during ischemia. Instead, intracellular cTn levels decrease before cell death, impacting acute myocardial infarction diagnosis.

Keywords:
Cardiac ischemiaCardiac troponin ICardiac troponin TCell deathHL-1 cardiomyocytes

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Area of Science:

  • Cardiology
  • Biochemistry
  • Cell Biology

Background:

  • Cardiac troponin I (cTnI) and T (cTnT) are key biomarkers for acute myocardial infarction (AMI).
  • Elevated cTn levels can occur without AMI, raising questions about the source of troponin release.
  • The release mechanism from viable versus damaged cardiomyocytes remains unclear.

Purpose of the Study:

  • To investigate if cardiac troponins are released from viable cardiomyocytes during ischemic conditions.
  • To identify differences in the release patterns and molecular forms of cTnI and cTnT.

Main Methods:

  • HL-1 cardiomyocytes were subjected to simulated ischemia (anoxia with glucose deprivation).
  • Cell viability was assessed using lactate dehydrogenase (LDH) release.
  • Intracellular and extracellular cTn levels and molecular forms were quantified using Western blots.

Main Results:

  • Intracellular cTnI and cTnT significantly decreased in ischemic cardiomyocytes before LDH release.
  • No corresponding increase in extracellular cTn was observed before cell death.
  • cTnI showed a more rapid intracellular decrease than cTnT, altering the cTnT/cTnI ratio.

Conclusions:

  • Cardiac troponins are released from cardiomyocytes only upon cell death (LDH release).
  • A significant decrease in intracellular cTn occurs in viable cardiomyocytes prior to cell death.
  • These findings necessitate careful interpretation of cTn levels in clinical practice, especially in non-AMI scenarios.