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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