Related Experiment Video

Updated: Apr 12, 2026

Voltage-Dependent Potassium Current Recording on H9c2 Cardiomyocytes via the Whole-Cell Patch-Clamp Technique
08:11

Voltage-Dependent Potassium Current Recording on H9c2 Cardiomyocytes via the Whole-Cell Patch-Clamp Technique

Published on: November 11, 2022

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THE INHIBITORY EFFECT OF PACLITAXEL ON (Kv2.1) K+ CURRENT IN H9c2 CELLS

Naoko Kitamura1, Kazuho Sakamoto, Tomoyuki Ono

  • 1Department of Pharmacology, Fukushima Medical University, School of Medicine.

Fukushima Journal of Medical Science
|May 22, 2015
PubMed

Insights

Paclitaxel, an anticancer drug, inhibits a key potassium channel (Kv2.1) in heart cells. This action may explain some of paclitaxel

Area of Science:

  • Cardiovascular Pharmacology
  • Ion Channel Physiology
  • Cancer Therapeutics

Background:

  • Paclitaxel is a widely used chemotherapy agent.
  • Cardiac and neuronal side effects are associated with paclitaxel treatment.
  • Kv2.1 channels play a crucial role in cardiac myocyte electrophysiology.

Purpose of the Study:

  • To investigate the effect of paclitaxel on K(+) current in H9c2 cells.
  • To determine the specific potassium channel subtype affected by paclitaxel.
  • To elucidate the mechanism of paclitaxel's interaction with Kv2.1 channels.

Main Methods:

  • Whole-cell voltage clamp technique.
  • H9c2 cell line derived from rat embryonic cardiac myocytes.
  • Concentration- and time-dependent analysis of ion channel currents.

Main Results:

  • Paclitaxel inhibited the Kv2.1 voltage-dependent K(+) current (IKur).
  • Inhibition was concentration-dependent with an IC50 of 1.1 µM at 200 ms.
  • The time-dependent inhibition suggests paclitaxel acts as an open channel blocker.

Conclusions:

  • Paclitaxel inhibits Kv2.1 potassium channels in cardiac myocytes.
  • This inhibition may contribute to the cardiotoxicity of paclitaxel.
  • Understanding this mechanism could inform strategies to mitigate paclitaxel's adverse effects.

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