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March 5, 2026Acta Pharmacologica Sinica0 citationsOpen Access

Cannabidiol Inhibits KV7.1 and KV7.1/KCNE1 Channels via Distinct Binding Sites

Cannabidiol inhibits both human KV7.1 and KV7.1/KCNE1 channels through distinct sites

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Why the study?

Little was known about the binding sites through which cannabidiol mediates inhibitory effects on KV7.1 and KV7.1/KCNE1, limiting insight toward developing selective KV7 modulators.

Population

Human KV7.1 and KV7.1/KCNE1 channels expressed in Xenopus laevis oocytes

Design

Preclinical computational and electrophysiological study

Key result

Cannabidiol inhibits human KV7.1 and KV7.1/KCNE1 potassium channels by binding to distinct sites, specifically the S5-S6 site in KV7.1 and the S6-S5'-E1 site in KV7.1/KCNE1.

Authors

AKA.S. KusayMPMichael PöklIHI. Hiniesto-Iñigo

Discussion

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Overview

CBD use warrants cardiac caution in vulnerable patients; extends insights into distinct binding sites to guide safer subtype-selective KV7 modulators.

Key Points

  • The research aims to identify the distinct binding sites of cannabidiol (CBD) on KV7.1 and KV7.1/KCNE1 channels to aid in the development of selective KV7 modulators.
  • Utilized artificial intelligence (Chai-1 model) for CBD binding site predictions.
  • Employed site-directed mutagenesis and electrophysiology in Xenopus laevis oocytes to validate these predictions.
  • Conducted molecular dynamics simulations to explore biophysical binding mechanisms.
  • CBD binds to two unique sites: the S5–S6 site in KV7.1 and the S6–S5'–E1 site in KV7.1/KCNE1.
  • Binding to KV7.1/KCNE1 blocks the S5–S6 site, suggesting a complex interaction.
  • Amino acid differences at binding sites imply varied inhibitory effects of CBD on KV7.1 channels compared to neuronal KV7 subtypes.

Structured PICO

P
Population
Xenopus laevis frog oocytes expressing human KV7.1 or KV7.1/KCNE1 channels
I
Intervention
Cannabidiol (CBD) (e.g., 30 µM, 100 µM) applied via continuous perfusion in extracellular solution
C
Comparator
Baseline channel behavior before solution exchange (control extracellular solution) and wild-type channels
O
Outcome
Binding site identification via changes in maximum conductance (ΔGMax) and voltage-dependence of channel activation (ΔV50)surrogate

Elucidates the distinct structural binding sites of cannabidiol on human KV7.1 and KV7.1/KCNE1 channels, providing critical molecular insights to guide the rational design of subtype-selective KV7 modulators lacking proarrhythmic cardiac effects.

Limitations

  • Varied CBD loss in different experimental systems may affect comparisons with previous studies

Cite This Study

Kusay et al. (2026) studied this question. Cannabidiol (CBD) vs. Wild-type channels was evaluated on Change in maximum conductance (ΔGMax) and voltage-dependence of activation (ΔV50). Cannabidiol inhibits human KV7.1 and KV7.1/KCNE1 potassium channels by binding to distinct sites, specifically the S5-S6 site in KV7.1 and the S6-S5'-E1 site in KV7.1/KCNE1.

synapsesocial.com/papers/69a91dd2d6127c7a504c1137https://doi.org/10.1038/s41401-025-01742-0
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