Related Experiment Video

Updated: Jun 28, 2026

Method for Identifying Small Molecule Inhibitors of the Protein-protein Interaction Between HCN1 and TRIP8b
10:20

Method for Identifying Small Molecule Inhibitors of the Protein-protein Interaction Between HCN1 and TRIP8b

Published on: November 11, 2016

HCN channels: structure, cellular regulation and physiological function

C Wahl-Schott1, M Biel

  • 1Center for Integrated Protein Science CIPSM and Zentrum für Pharmaforschung, Department Pharmazie, Pharmakologie für Naturwissenschaften, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, 81377 München, Germany.

Cellular and Molecular Life Sciences : CMLS
|October 28, 2008
PubMed

Insights

Hyperpolarization-activated and cyclic nucleotide-gated (HCN) channels control heart and brain rhythm. This review details their unique structure, function, and regulation by cAMP, emphasizing their crucial roles.

Area of Science:

  • Ion channel physiology
  • Molecular and cellular neuroscience
  • Cardiovascular physiology

Background:

  • Hyperpolarization-activated and cyclic nucleotide-gated (HCN) channels are a unique class of voltage-gated ion channels.
  • They exhibit reverse voltage-dependence, activating upon hyperpolarization, and are directly regulated by cyclic adenosine monophosphate (cAMP).
  • HCN channels (HCN1-4) are crucial for cardiac and neuronal pacemaking (I(h) or I(f) current).

Purpose of the Study:

  • To provide a comprehensive overview of HCN channel structure, function, and regulation.
  • To highlight the intricate roles of HCN channels in neuronal function.
  • To emphasize the significance of HCN channels in cardiac rhythmicity.

Main Methods:

  • Literature review of existing research on HCN channels.
  • Analysis of structural and functional properties of HCN channels.
  • Synthesis of data on HCN channel regulation and physiological roles.

Main Results:

  • Detailed description of HCN channel structure and unique reverse voltage-dependence.
  • Explanation of cAMP-mediated regulation of HCN channel activity.
  • Elucidation of HCN channels' contribution to cardiac and neuronal pacemaking.
  • Identification of HCN channels' roles in resting membrane potential, dendritic integration, and synaptic transmission.

Conclusions:

  • HCN channels are fundamental to electrical activity in the heart and brain.
  • Their unique properties and regulation by cAMP underscore their importance in physiological and pathological processes.
  • Further research into HCN channels promises insights into treating cardiac arrhythmias and neurological disorders.

More Related Videos

One-channel Cell-attached Patch-clamp Recording13:07

One-channel Cell-attached Patch-clamp Recording

Published on: June 9, 2014

Functional Characterization of Na+/H+ Exchangers of Intracellular Compartments Using Proton-killing Selection to Express Them at the Plasma Membrane07:38

Functional Characterization of Na+/H+ Exchangers of Intracellular Compartments Using Proton-killing Selection to Express Them at the Plasma Membrane

Published on: March 30, 2015

Related Concept Videos

pH Regulation in Cells01:28

pH Regulation in Cells

pH plays a critical role in maintaining normal cellular activities. It helps maintain the structure and function of various proteins, dictates the charge on cellular membranes, and is crucial for metabolic reactions inside the cell. Moreover, cells use the energy from the proton motive force to generate ATP.
Cytosolic pH
Under physiological conditions, the cytosolic pH is slightly more acidic than the extracellular pH. However, cells must prevent further acidification of their cytosol to...
Voltage-gated Ion Channels01:26

Voltage-gated Ion Channels

Voltage-gated ion channels are transmembrane proteins that open and close in response to changes in the membrane potential. They are present on the membranes of all electrically excitable cells such as neurons, heart, and muscle cells.
Generally, all voltage-gated ion channels have a 'voltage-sensing domain' that spans the lipid bilayer. The charged residues in the sensor move in response to the membrane potential changes that open the channel allowing ions movement. There are several types of...
Voltage-gated Ion Channels01:26

Voltage-gated Ion Channels

Voltage-gated ion channels are transmembrane proteins that open and close in response to changes in the membrane potential. They are present on the membranes of all electrically excitable cells such as neurons, heart, and muscle cells.
Generally, all voltage-gated ion channels have a 'voltage-sensing domain' that spans the lipid bilayer. The charged residues in the sensor move in response to the membrane potential changes that open the channel allowing ions movement. There are several types of...
Ligand-Gated Ion Channel Receptor: Gating Mechanism01:30

Ligand-Gated Ion Channel Receptor: Gating Mechanism

Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
Mechanically-gated Ion Channels01:12

Mechanically-gated Ion Channels

Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
Mechanically-gated Ion Channels01:12

Mechanically-gated Ion Channels

Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...