Related Experiment Video

Updated: Feb 6, 2026

Profiling Voltage-gated Potassium Channel mRNA Expression in Nigral Neurons using Single-cell RT-PCR Techniques
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Profiling Voltage-gated Potassium Channel mRNA Expression in Nigral Neurons using Single-cell RT-PCR Techniques

Published on: September 27, 2011

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Inhibition of hyperpolarization-activated cyclic nucleotide-gated channels by β-blocker carvedilol

Ying Cao1, Shujun Chen1, Yemei Liang1

  • 1Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, China.

British Journal of Pharmacology
|August 12, 2018
PubMed

Insights

Carvedilol inhibits hyperpolarization-activated cyclic nucleotide (HCN) channels, particularly HCN4, which may explain its benefits in heart failure. This finding offers a novel structure for developing new HCN channel inhibitors.

Area of Science:

  • Cardiovascular Pharmacology
  • Ion Channel Physiology

Background:

  • Carvedilol is a beta-blocker effective for congestive heart failure (CHF).
  • The mechanism of carvedilol's superior efficacy in CHF is unclear.
  • Hyperpolarization-activated cyclic nucleotide (HCN)-gated channels are crucial for heart rate regulation and potential CHF treatments.

Purpose of the Study:

  • To investigate the effect of carvedilol on HCN channels.
  • To determine if carvedilol modulates HCN channel activity.

Main Methods:

  • Whole-cell patch-clamp recordings were used.
  • Carvedilol's effects were assessed on wild-type and mutant HCN1, HCN2, and HCN4 channels expressed in CHO cells.

Main Results:

  • Carvedilol selectively inhibited the sinoatrial HCN channel isoform, HCN4, in a concentration-dependent manner (EC50 = 4.4 μM).
  • Carvedilol also inhibited HCN1 and HCN2 channels.
  • Carvedilol acts as a negative gating modulator, slowing activation and deactivation rates, and shifting voltage dependence, distinguishing it from open-channel blockers like ivabradine.

Conclusions:

  • Carvedilol negatively modulates HCN channel gating.
  • This action on HCN channels provides a novel mechanism for carvedilol's therapeutic effects in CHF.
  • Carvedilol's interaction with HCN channels presents a new structural basis for designing future HCN channel inhibitors.
Abstract

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