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Hyperpolarization-Activated Cyclic Nucleotide-Gated Channel Currents in Neurons.

¹Department of Pharmacology, UCL School of Pharmacy, University College London, London WC1N 1AX, United Kingdom.

Cold Spring Harbor Protocols

|July 3, 2016

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Published on: October 8, 2014

Area of Science:

Neuroscience
Ion Channel Physiology

Background:

Hyperpolarization-activated cyclic nucleotide-gated (HCN) channels are voltage-gated ion channels permeable to Na(+) and K(+).
Four HCN subunits (HCN1-4) exist with distinct expression and biophysical properties.
Cyclic nucleotides and intracellular substances modulate HCN channel function.

Purpose of the Study:

To explore the diverse roles and modulations of HCN channels and their associated current, Ih.
To highlight the significance of Ih in neuronal intrinsic properties and excitability.

Main Methods:

Review of existing literature on HCN channel structure, function, and modulation.
Analysis of the impact of Ih on postsynaptic and presynaptic neuronal functions.

Main Results:

Ih significantly influences resting membrane potential, membrane resistance, and synaptic integration.
Ih affects neuronal resonance properties and intrinsic oscillations.
Presynaptic Ih modulates neurotransmitter release, contributing to complex effects on neuronal excitability.

Conclusions:

HCN channels and Ih play multifaceted roles in neuronal function.
A comprehensive understanding of Ih is essential for elucidating physiological processes like learning and pathophysiological states such as epilepsy.