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August 20, 2025Open Access

Dysferlin Regulates Cardiac T-tubule Structure and Excitation-contraction Coupling in Isolated Cardiac Myocytes at Rest and in Response to Acute Hypo-osmotic Stress and is Protective Against Arrhythmias in Langendorff-perfused Hearts

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Authors

CQCallum J. QuinnCBC. BoothKSKerri L. M. Smith

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Overview

Dysferlin regulates T-tubule density and arrhythmia susceptibility in cardiac myocytes under stress, suggesting protective mechanisms.

Key Points

  • Loss of dysferlin leads to decreased T-tubule density and altered intracellular calcium handling, affecting cardiac function.
  • Dysferlin knockout hearts show increased vulnerability to ventricular arrhythmias during hypo-osmotic stress.
  • Experimental manipulation using hypo-osmotic shock revealed significant alterations in T-tubule integrity in dysferlin-deficient cells.
  • Age-related decline in dysferlin may contribute to detrimental T-tubule remodeling, impacting cardiac health.

Cite This Study

Quinn et al. (2025) studied this question.

synapsesocial.com/papers/68af40a1cf1dd9ea359ecbe5https://doi.org/10.1101/2025.08.20.671306
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