Key result
D96V-CaM promotes arrhythmias by dysregulating NaV1.6 within T-tubules, inducing a proarrhythmic late Na+ current and facilitating aberrant Ca2+ release.
Why the study?
D96V-CaM prolongs action potential duration more than other LQT-associated CaMs despite comparable LTCC dysfunction, suggesting dysregulation of other depolarizing channels.
Population
Mice with cardiac-specific expression of D96V-CaM, cardiac-specific NaV1.6 KO mice, and WT mice
Comparison
cD96V mice vs WT mice, and cardiac-specific NaV1.6 KO
Design
Preclinical mechanistic animal and cellular study
Authors
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Hypothesis-generating for NaV1.6 inhibition in calmodulinopathies; human studies required before clinical consideration.
D96V-CaM promotes arrhythmias by dysregulating NaV1.6 and LTCCs within T-tubules, suggesting NaV1.6 as a potential therapeutic target for calmodulinopathies.
Tarasov et al. (2023) studied Calmodulinopathy / Long QT syndrome. D96V-CaM mutation vs. Wild-type CaM was evaluated on Late Na+ current (INa) and arrhythmogenesis. D96V-CaM promotes arrhythmias by dysregulating NaV1.6 within T-tubules, inducing a proarrhythmic late Na+ current and facilitating aberrant Ca2+ release.
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