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  • 1Département de Physiologie, CNRS, UMR-5203, Institut de Génomique Fonctionnelle, Montpellier F-34000, France INSERM, U1191, Montpellier F-34000, France Université de Montpellier, UMR-5203, Montpellier F-34000, France matteo.mangoni@igf.cnrs.fr angelotorrente@hotmail.com.

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Cav1.3 channels are crucial for sino-atrial node (SAN) automaticity, regulating intracellular calcium dynamics and pacemaker activity. Their absence impairs heart rate generation, potentially explaining congenital SAN dysfunction.

Keywords:
Ca2+ dynamicsCav1.3L-type Ca2+ channelsPacemaker activitySino-atrial node

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Area of Science:

  • Cardiovascular Physiology
  • Molecular Cardiology
  • Ion Channel Function

Background:

  • Sino-atrial node (SAN) automaticity underlies heart rate generation but is not fully understood.
  • Intracellular calcium ([Ca(2+)]i) dynamics are vital for SAN pacemaker activity.
  • The role of L-type calcium channels in regulating SAN [Ca(2+)]i release is largely unexplored.

Purpose of the Study:

  • To investigate the functional role of Cav1.3 L-type calcium channels in controlling SAN [Ca(2+)]i dynamics and pacemaker activity.
  • To compare [Ca(2+)]i dynamics in wild-type (WT) and Cav1.3 knockout (KO) mice.

Main Methods:

  • Studied [Ca(2+)]i dynamics in isolated SAN cells and ex vivo SAN preparations from WT and Cav1.3 KO mice.
  • Utilized voltage-clamp experiments with WT action potentials on KO cells.
  • Assessed effects of β-adrenergic stimulation and caffeine treatment.

Main Results:

  • Cav1.3 deficiency significantly impaired [Ca(2+)]i dynamics, reducing local release events and synchronization.
  • This impairment inhibited Ca(2+) transients and delayed spontaneous SAN activity.
  • While sarcoplasmic reticulum Ca(2+) load was normal in KO cells, β-adrenergic stimulation showed reduced response, and caffeine partially rescued activity.

Conclusions:

  • Cav1.3 channels are critical for regulating SAN [Ca(2+)]i dynamics and triggering local Ca(2+) releases, thereby controlling pacemaker activity.
  • Loss of Cav1.3 function offers a novel pathophysiological mechanism for congenital SAN dysfunction and heart block in humans.