Synergy between Membrane Currents Prevents Severe Bradycardia in Mouse Sinoatrial Node Tissue.

ABSTRACT: Bradycardia is initiated by the sinoatrial node (SAN), which is regulated by a coupled-clock system. Due to the clock coupling, reduction in the 'funny' current (I_f), which affects SAN automaticity, can be compensated, thus preventing severe bradycardia. We hypothesize that this fail-safe system is an inherent feature of SAN pacemaker cells and is driven by synergy between I_f and other ion channels. This work aimed to characterize the connection between membrane currents and their underlying mechanisms in SAN cells. SAN tissues were isolated from C57BL mice and Ca²⁺ signaling was measured in pacemaker cells within them. A computational model of SAN cells was used to understand the interactions between cell components. Beat interval (BI) was prolonged by 54

SUBMITTER: Arbel Ganon L 

PROVIDER: S-EPMC10051777 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature