학술논문
An arrhythmogenic metabolite in atrial fibrillation.
Document Type
Article
Author
Krause, Julia; Nickel, Alexander; Madsen, Alexandra; Aitken-Buck, Hamish M.; Stoter, A. M. Stella; Schrapers, Jessica; Ojeda, Francisco; Geiger, Kira; Kern, Melanie; Kohlhaas, Michael; Bertero, Edoardo; Hofmockel, Patrick; Hübner, Florian; Assum, Ines; Heinig, Matthias; Müller, Christian; Hansen, Arne; Krause, Tobias; Park, Deung-Dae; Just, Steffen
Source
Subject
*ATRIAL fibrillation
*HEART metabolism
*RESPIRATION
*METABOLISM
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Language
ISSN
1479-5876
Abstract
Background: Long-chain acyl-carnitines (ACs) are potential arrhythmogenic metabolites. Their role in atrial fibrillation (AF) remains incompletely understood. Using a systems medicine approach, we assessed the contribution of C18:1AC to AF by analysing its in vitro effects on cardiac electrophysiology and metabolism, and translated our findings into the human setting. Methods and results: Human iPSC-derived engineered heart tissue was exposed to C18:1AC. A biphasic effect on contractile force was observed: short exposure enhanced contractile force, but elicited spontaneous contractions and impaired Ca2+ handling. Continuous exposure provoked an impairment of contractile force. In human atrial mitochondria from AF individuals, C18:1AC inhibited respiration. In a population-based cohort as well as a cohort of patients, high C18:1AC serum concentrations were associated with the incidence and prevalence of AF. Conclusion: Our data provide evidence for an arrhythmogenic potential of the metabolite C18:1AC. The metabolite interferes with mitochondrial metabolism, thereby contributing to contractile dysfunction and shows predictive potential as novel circulating biomarker for risk of AF. [ABSTRACT FROM AUTHOR]