STIM1-Ca2+ signaling in coronary sinus cardiomyocytes contributes to interatrial conduction.

Journal Article (Journal Article)

Pacemaker action potentials emerge from the sinoatrial node (SAN) and rapidly propagate through the atria to the AV node via preferential conduction pathways, including one associated with the coronary sinus. However, few distinguishing features of these tracts are known. Identifying specific molecular markers to distinguish among these conduction pathways will have important implications for understanding atrial conduction and atrial arrhythmogenesis. Using a Stim1 reporter mouse, we discovered stromal interaction molecule 1 (STIM1)-expressing coronary sinus cardiomyocytes (CSC)s in a tract from the SAN to the coronary sinus. Our studies here establish that STIM1 is a molecular marker of CSCs and we propose a role for STIM1-CSCs in interatrial conduction. Deletion of Stim1 from the CSCs slowed interatrial conduction and increased susceptibility to atrial arrhythmias. Store-operated Ca2+ currents (Isoc) in response to Ca2+ store depletion were markedly reduced in CSCs and their action potentials showed electrical remodeling. Our studies identify STIM1 as a molecular marker for a coronary sinus interatrial conduction pathway. We propose a role for SOCE in Ca2+ signaling of CSCs and implicate STIM1 in atrial arrhythmogenesis.

Full Text

Duke Authors

Cited Authors

  • Zhang, H; Bryson, V; Luo, N; Sun, AY; Rosenberg, P

Published Date

  • May 2020

Published In

Volume / Issue

  • 87 /

Start / End Page

  • 102163 -

PubMed ID

  • 32014794

Pubmed Central ID

  • PMC9528917

Electronic International Standard Serial Number (EISSN)

  • 1532-1991

Digital Object Identifier (DOI)

  • 10.1016/j.ceca.2020.102163

Language

  • eng

Conference Location

  • Netherlands