Key Points
- The research aims to understand the role of HCN1 in the generation of the cardiac pacemaker current I(f) in the sinoatrial node.
- Cloning and heterologous expression of HCN1 from rabbit sinoatrial node
- Localization studies in pacemaker myocytes
- Electrophysiological characterization in human embryonic kidney 293 cells
- HCN1 was found specifically in sinoatrial node myocytes and not in adjacent heart regions.
- Electrophysiological properties of HCN1 correlate with those of the pacemaker current I(f).
- Identified HCN1 as a central component in forming the pacemaker current in cardiac tissues.
Structured PICO
PPopulationRabbit sinoatrial node (SAN) tissue and human embryonic kidney 293 cells
IInterventionCloning and heterologous expression of rbHCN1
OOutcomeElectrophysiological properties and specific localization of HCN1 in pacemaker myocytes
HCN1 plays a central and specific role in the formation of sinoatrial node pacemaker currents, providing molecular insight into cardiac rhythm regulation.