HCN channels as targets for drug discovery
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Updated: Jun 26, 2026

Method for Identifying Small Molecule Inhibitors of the Protein-protein Interaction Between HCN1 and TRIP8b
Published on: November 11, 2016
Michael P Maher1, Nyan-Tsz Wu, Hong-Qing Guo
1Johnson & Johnson Pharmaceutical Research and Development, L.L.C., San Diego, CA 92121, USA.
Insights
Hyperpolarization- and Cyclic Nucleotide-gated (HCN) channels are crucial for heart rate and neuronal activity. Blocking these channels may offer new pain relief strategies for nerve injury.
Area of Science:
- Neuroscience
- Pharmacology
- Molecular Biology
Background:
- Hyperpolarization- and Cyclic Nucleotide-gated (HCN) channels are non-selective cation channels involved in regulating heart rate and neuronal excitability.
- HCN channels are the molecular basis for the hyperpolarization-activated current I(h).
Purpose of the Study:
- To review evidence supporting the role of HCN channels in sensory neurons and pain sensation.
- To summarize the development and validation of screening methods for novel HCN channel blockers.
Main Methods:
- Literature review of molecular and pharmacological evidence.
- Description of efforts in developing and validating screening assays for HCN channel blockers.
Main Results:
- Emerging evidence implicates HCN channels in sensory neuron function and pain, especially in injury-related pain.
- Methods for screening HCN channel blockers have been developed and validated.
Conclusions:
- HCN channels are potential therapeutic targets for novel analgesic agents.
- The developed screening methods facilitate the discovery of new pain management drugs.
Abstract:
Hyperpolarization- and Cyclic Nucleotide-gated (HCN) channels are a family of six transmembrane domain, single pore-loop, hyperpolarization activated, non-selective cation channels. The HCN family consists of four members (HCN1-4). HCN channels represent the molecular correlates of I(h) (also known as 'funny' I(f) and 'queer' I(q)), a hyperpolarization-activated current best known for its role in controlling heart rate and in the regulation of neuronal resting membrane potential and excitability. A significant body of molecular and pharmacological evidence is now emerging to support a role for these channels in the function of sensory neurons and pain sensation, particularly pain associated with nerve or tissue injury. As such, HCN channels may represent valid targets for novel analgesic agents. This evidence will be reviewed in this article. We will then summarize our efforts to develop and validate methods for screening for novel HCN channel blockers.
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