TY - JOUR
T1 - Fibroblast growth factor homologous factors serve as a molecular rheostat in tuning arrhythmogenic cardiac late sodium current
AU - Chakouri, Nourdine
AU - Rivas, Sharen
AU - Roybal, Daniel
AU - Yang, Lin
AU - Diaz, Johanna
AU - Hsu, Allen L.
AU - Mahling, Ryan
AU - Chen, Bi Xing
AU - Owoyemi, Josiah O.
AU - DiSilvestre, Deborah
AU - Sirabella, Dario
AU - Corneo, Barbara
AU - Tomaselli, Gordon F.
AU - Dick, Ivy E.
AU - Marx, Steven O.
AU - Ben-Johny, Manu
N1 - Publisher Copyright:
© 2022, The Author(s), under exclusive licence to Springer Nature Limited.
PY - 2022/5
Y1 - 2022/5
N2 - Voltage-gated sodium channels (Nav channels) support the genesis and brisk spatial propagation of action potentials in the heart. Disruption of NaV1.5 inactivation results in a small persistent sodium influx known as late sodium current (I Na,L), which has emerged as a common pathogenic mechanism in both congenital and acquired cardiac arrhythmogenic syndromes. In the present study, using low-noise multichannel recordings in heterologous systems, LQTS3 patient-derived induced pluripotent stem cell cardiomyocytes and mouse ventricular myocytes, we demonstrate that the intracellular fibroblast growth factor homologous factors (FHF1–4) tune pathogenic I Na,L in an isoform-specific manner. This scheme suggests a complex orchestration of I Na,L in cardiomyocytes that may contribute to variable disease expressivity of NaV1.5 channelopathies. We further leverage these observations to engineer a peptide inhibitor of I Na,L with a higher efficacy compared with a well-established small-molecule inhibitor. Overall, these findings lend insights into molecular mechanisms underlying FHF regulation of I Na,L in pathophysiology and outline potential therapeutic avenues.
AB - Voltage-gated sodium channels (Nav channels) support the genesis and brisk spatial propagation of action potentials in the heart. Disruption of NaV1.5 inactivation results in a small persistent sodium influx known as late sodium current (I Na,L), which has emerged as a common pathogenic mechanism in both congenital and acquired cardiac arrhythmogenic syndromes. In the present study, using low-noise multichannel recordings in heterologous systems, LQTS3 patient-derived induced pluripotent stem cell cardiomyocytes and mouse ventricular myocytes, we demonstrate that the intracellular fibroblast growth factor homologous factors (FHF1–4) tune pathogenic I Na,L in an isoform-specific manner. This scheme suggests a complex orchestration of I Na,L in cardiomyocytes that may contribute to variable disease expressivity of NaV1.5 channelopathies. We further leverage these observations to engineer a peptide inhibitor of I Na,L with a higher efficacy compared with a well-established small-molecule inhibitor. Overall, these findings lend insights into molecular mechanisms underlying FHF regulation of I Na,L in pathophysiology and outline potential therapeutic avenues.
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U2 - 10.1038/s44161-022-00060-6
DO - 10.1038/s44161-022-00060-6
M3 - Article
AN - SCOPUS:85140407365
SN - 2731-0590
VL - 1
SP - 1
EP - 13
JO - Nature Cardiovascular Research
JF - Nature Cardiovascular Research
IS - 5
ER -