Hyperpolarization-Activated Cation Currents: From Molecules to Physiological Function

2003/01/31 by Richard B. Robinson, Steven A. Siegelbaum · 1,195 citations
Biochemistry, Genetics and Molecular Biology · Chemistry · Medicine · Neuroscience · #Biology #Biophysics #Cardiac electrophysiology and arrhythmias #Chemistry #Conductance #Electrophysiology #Hyperpolarization (physics) #Ion channel regulation and function #Neuroscience #Neuroscience and Neuropharmacology Research #Physics #Stereochemistry

paper · doi:10.1146/annurev.physiol.65.092101.142734

published in Annual Review of Physiology 65(1), 453-480 (Annual Reviews)

openalex publication_date 2003/01/31 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01

Abstract

Hyperpolarization-activated cation currents, termed If, Ih, or Iq, were initially discovered in heart and nerve cells over 20 years ago. These currents contribute to a wide range of physiological functions, including cardiac and neuronal pacemaker activity, the setting of resting potentials, input conductance and length constants, and dendritic integration. The hyperpolarization-activated, cation nonselective (HCN) gene family encodes the channels that underlie Ih. Here we review the relation between the biophysical properties of recombinant HCN channels and the pattern of HCN mRNA expression with the properties of native Ih in neurons and cardiac muscle. Moreover, we consider selected examples of the expanding physiological functions of Ih with a view toward understanding how the properties of HCN channels contribute to these diverse functional roles.

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