Why the study?
Cardiac electrophysiological phenotypes in Trpm4 knockdown mouse models remained incompletely characterized despite TRPM4 variants being linked to conduction block and Brugada syndrome.
Does Trpm4 deletion alter Na+ currents and NaV1.5 expression in murine cardiac myocytes?
Population
Isolated atrial and ventricular myocytes and explanted or in vivo mouse hearts
Comparison
Trpm4 deletion (Trpm4 -/-) vs wild-type
Design
Preclinical experimental study using patch clamp, immunohistochemistry, and ECGs
Key result
Deletion of Trpm4 in murine cardiac myocytes reduced peak Na+ currents by up to 30% and decreased NaV1.5 protein expression by 50% in ventricles, resulting in slower intraventricular conduction.
Authors
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TRPM4 variants may warrant inclusion in arrhythmia genetic panels; leaves open pathogenicity and clinical utility pending validation.
Does Trpm4 deletion alter Na+ currents and NaV1.5 expression in murine cardiac myocytes?
Trpm4 deletion reduces peak Na+ currents and NaV1.5 protein expression in murine cardiac myocytes, suggesting a novel regulatory role of Trpm4 in cardiac electrophysiology.
Ozhathil et al. (2020) studied Cardiac electrical activity (preclinical). Trpm4 deletion vs. Wildtype (WT) littermates was evaluated on Peak Na+ current density and NaV1.5 protein expression. Deletion of Trpm4 in murine cardiac myocytes reduced peak Na+ currents by up to 30% and decreased NaV1.5 protein expression by 50% in ventricles, resulting in slower intraventricular conduction.
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