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HCN Channels Modulators: The Need for Selectivity.

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Hyperpolarization-activated, cyclic nucleotide-gated (HCN) channels are crucial for physiological processes. This review surveys compounds targeting HCN channels, aiming to guide the development of new, selective drugs for various diseases.

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Area of Science:

  • Pharmacology
  • Molecular Biology
  • Cardiology

Background:

  • Hyperpolarization-activated, cyclic nucleotide-gated (HCN) channels generate the If/Ih current, vital for physiological functions.
  • HCN channels are implicated in numerous physiological and pathological conditions.
  • HCN4 channels in the Sino Atrial Node are the specific target of ivabradine, a bradycardic drug.

Purpose of the Study:

  • To review compounds that interact with HCN channels.
  • To summarize knowledge on HCN channel binding sites.
  • To provide insights for designing novel, potent, and isoform-selective HCN channel modulators.

Main Methods:

  • Literature review of existing and designed compounds targeting HCN channels.
  • Analysis of reported binding sites for these compounds.
  • Synthesis of current knowledge on HCN channel pharmacology.

Main Results:

  • HCN channels are targets for drugs impacting physiological and pathological processes.
  • Ivabradine specifically blocks HCN4 channels in the Sino Atrial Node.
  • Various agents modulate HCN channels, contributing to therapeutic effects or side effects.

Conclusions:

  • HCN channels are promising targets for drug development.
  • Developing isoform-selective compounds is critical due to HCN channel distribution.
  • This review offers a foundation for designing new HCN channel modulators.