Key result
Extracellular vesicle-bound cardiac troponin signatures discriminate myocardial infarction from tachyarrhythmia-induced myocardial injury.
Why the study?
The origin and significance of circulating cardiac troponins in the absence of overt myocardial necrosis remain unclear, necessitating improved diagnostic specificity for myocardial ischemia and injury.
Observational
No
p-value: p=<0.0001
The relative circulating extracellular vesicle-bound fraction of cardiac troponin serves as a novel biomarker that robustly discriminates between ischemic and non-ischemic causes of myocardial injury.
May enhance troponin specificity for ischemia; leaves open clinical adoption pending prospective human validation.
Background Various cardiovascular diseases are associated with transient troponin elevation, warranting further potentially invasive diagnostic measures to rule out myocardial ischemia. The origin of circulating cardiac troponins in the absence of overt myocardial necrosis remains unclear. Extracellular vesicles (EV) secreted by cardiomyocytes were found to contain cardiac troponins of unknown significance to date. Objectives We aim to investigate the presence of distinct distribution patterns of cardiac troponins in circulating EV and free plasma. Methods H9c2 cardiomyocytes exposed to hypoxia were investigated for troponin disintegration and vesicular troponin secretion. In a murine model of myocardial infarction and porcine model of atrial fibrillation, EV secretion into blood and EV-bound troponin fraction were studied. In two patient cohorts encompassing patients with myocardial infarction, tachyarrhythmia and healthy controls, EV- and non-EV-fraction troponin patterns were quantified. Results Hypoxic conditioning of cardiomyocytes enhanced EV-bound troponin T secretion. Minimal invasive myocardial infarction in mice caused pronounced systemic EV release. Induction of atrial fibrillation in pigs induced EV release and a shift in relative circulating troponin T compartmentalization. In patients presenting with tachyarrhythmia and myocardial infarction, elevated circulating EV concentrations were observed, concomitant with disease-specific relative EV-troponin fractional signatures in blood, concurrent with observations made in animal models. Circulating EV-troponin compartmental signatures could robustly discriminate myocardial infarction from tachyarrhythmia-induced myocardial injury, and further distinguish first diagnosis from recurrent tachyarrhythmia. Conclusions This study introduces the relative EV-troponin fraction as a novel biomarker in cardiovascular disease, improving diagnostic specificity for ischemic and non-ischemic myocardial disease entities.
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Krohn et al. (2026) conducted an observational in Myocardial ischemia and tachyarrhythmia. Myocardial ischemia (NSTEMI) or tachyarrhythmia vs. Healthy controls was evaluated on Relative extracellular vesicle-bound cardiac troponin T fraction (p=<0.0001). Circulating extracellular vesicle-bound cardiac troponin fractional signatures significantly discriminated myocardial infarction from tachyarrhythmia-induced myocardial injury.
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