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Updates on HCN Channels in the Heart: Function, Dysfunction and Pharmacology

Laura Sartiani1, Maria Novella Romanelli, Alessandro Mugelli

  • 1Department of NeuroFarBa, C.I.M.M.B.A., University of Florence, Viale Pieraccini, 6, 50139 Florence, Italy. laura.sartiani@unifi.it.

Current Drug Targets
|June 2, 2015
PubMed

Insights

Hyperpolarization-activated cyclic nucleotide-gated (HCN) channels are crucial for heart rhythm. Dysfunction in these cardiac channels can cause arrhythmias, but blockade with ivabradine shows therapeutic potential.

Area of Science:

  • Cardiovascular physiology
  • Molecular cardiology
  • Ion channel research

Background:

  • Hyperpolarization-activated cyclic nucleotide-gated (HCN) channels are key to cardiac pacemaker activity.
  • HCN channels are present in various cardiac cells, with roles in adult cardiomyocytes under investigation.
  • Channel dysfunction is implicated in cardiac rhythm disorders.

Purpose of the Study:

  • To investigate the role of HCN channels in cardiac function and pathology.
  • To explore the therapeutic potential of modulating HCN channel activity.

Main Methods:

  • Review of literature on HCN channel function in cardiac physiology and pathology.
  • Analysis of clinical and experimental data regarding HCN channel mutations and pharmacological interventions.

Main Results:

  • Loss-of-function mutations in HCN channels are linked to sinus bradycardia.
  • Gain-of-function in HCN channels may promote arrhythmias like atrial fibrillation and ventricular hypertrophy.
  • Ivabradine, an HCN channel blocker, improves cardiac performance and outcomes in heart failure.

Conclusions:

  • HCN channels are critical determinants of cardiac rhythm.
  • Targeting HCN channels, particularly with ivabradine, offers a promising therapeutic strategy for cardiac arrhythmias and heart failure.
  • Development of novel, selective HCN channel modulators is ongoing.

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