4.6 Article

Human induced pluripotent stem cell-derived atrial cardiomyocytes carrying an SCN5A mutation identify nitric oxide signaling as a mediator of atrial fibrillation

期刊

STEM CELL REPORTS
卷 16, 期 6, 页码 1542-1554

出版社

CELL PRESS
DOI: 10.1016/j.stemcr.2021.04.019

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资金

  1. AHA grant [19CDA34 630041]
  2. NIH [R01 GM139991, R01 HL150586, R01 HL148444, T32 HL139439, R01 HL126516]
  3. Fondation Leducq [18CVD05, R24 HL117756, R01 HL148756]
  4. NCATS [UL1TR002003]

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SCN5A mutations linked with familial atrial fibrillation cause spontaneous arrhythmogenic activity and prolonged action potential duration in patient-specific induced pluripotent stem cell-derived atrial cardiomyocytes. These mutations may trigger atrial fibrillation through modulation of late sodium currents via the nitric oxide signaling pathway.
Mutations in SCN5A, encoding the cardiac sodium channel, are linked with familial atrial fibrillation (AF) but the underlying pathophysiologic mechanisms and implications for therapy remain unclear. To characterize the pathogenesis of AF-linked SCN5A mutations, we generated patient-specific induced pluripotent stem cell-derived atrial cardiomyocytes (iPSC-aCMs) from two kindreds carrying SCN5A mutations (E428K and N470K) and isogenic controls using CRISPR-Cas9 gene editing. We showed that mutant AF iPSC-aCMs exhibited spontaneous arrhythmogenic activity with beat-to-beat irregularity, prolonged action potential duration, and triggered-like beats. Single-cell recording revealed enhanced late sodium currents (I-Na,I-L) in AF iPSC-aCMs that were absent in a heterologous expression model. Gene expression profiling of AF iPSC-aCMs showed differential expression of the nitric oxide (NO)-mediated signaling pathway underlying enhanced I-Na,I-L. We showed that patient-specific AF iPSC-aCMs exhibited striking in vitro electrophysiological phenotype of AF-linked SCN5A mutations, and transcriptomic analyses supported that the NO signaling pathway modulated the I-Na,I-L and triggered AF.

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