Cited by 151Cardiac electrophysiology and arrhythmiasIon channel regulation and functionCardiac pacing and defibrillation studies

The cardiac pacemaker current

Baruscotti, Mirko, Barbuti, Andrea, Bucchi, Annalisa·2010·Journal of Molecular and Cellular Cardiology

Abstract

In mammals cardiac rate is determined by the duration of the diastolic depolarization of sinoatrial node (SAN) cells which is mainly determined by the pacemaker I(f) current. f-channels are encoded by four members of the hyperpolarization-activated cyclic nucleotide-gated gene (HCN1-4) family. HCN4 is the most abundant isoform in the SAN, and its relevance to pacemaking has been further supported by the discovery of four loss-of-function mutations in patients with mild or severe forms of cardiac rate disturbances. Due to its selective contribution to pacemaking, the I(f) current is also the pharmacological target of a selective heart rate-reducing agent (ivabradine) currently used in the clinical practice. Albeit to a minor extent, the I(f) current is also present in other spontaneously active myocytes of the cardiac conduction system (atrioventricular node and Purkinje fibres). In working atrial and ventricular myocytes f-channels are expressed at a very low level and do not play any physiological role; however in certain pathological conditions over-expression of HCN proteins may represent an arrhythmogenic mechanism. In this review some of the most recent findings on f/HCN channels contribution to pacemaking are described.

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Crossref · 10.1016/j.yjmcc.2009.06.019

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Authors
Baruscotti, M., Barbuti, A., & Bucchi, A.
Affiliations
University of Milan (IT)
Corresponding author
Baruscotti, Mirko
Venue
Journal of Molecular and Cellular Cardiology
Publisher
Elsevier BV
Published
2010-01
Volume
48
Issue
1
Pages
55-64
ISSN
0022-2828 (ISSN-L)
OpenAlex
W2040918451
Cited by
149
References
153
Citations by year
2026: 3 · 2025: 5 · 2024: 5 · 2023: 9 · 2022: 1 · 2021: 12 · 2020: 8 · 2019: 4 · 2018: 9 · 2017: 8 · 2016: 8 · 2015: 6 · 2014: 20 · 2013: 14 · 2012: 11
FWCI
1.86
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Molecular and Cellular Cardiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • European Commission
  • Ministero dell'Università e della Ricerca
Topics
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac electrophysiology and arrhythmias
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac pacing and defibrillation studies
Keywords
HCN channels, HCN4, sinoatrial node, cardiac pacemaking, ivabradine, heart rate regulation, cardiac arrhythmias, atrioventricular node, Purkinje fibers
MeSH terms
Animals, Heart Rate, Humans, Models, Biological, Myocardium, Sinoatrial Node, Cyclic Nucleotide-Gated Cation Channels

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