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Updated: Jun 20, 2026

Isolation and Kv Channel Recordings in Murine Atrial and Ventricular Cardiomyocytes
11:33

Isolation and Kv Channel Recordings in Murine Atrial and Ventricular Cardiomyocytes

Published on: March 12, 2013

The intermediate-conductance calcium-activated potassium channel KCa3.1 contributes to atherogenesis in mice and

Kazuyoshi Toyama1, Heike Wulff, K George Chandy

  • 1Department of Medicine and Cardiovascular Center, Medical College of Wisconsin, Milwaukee, Wisconsin 53226, USA.

The Journal of Clinical Investigation
|August 9, 2008
PubMed

Insights

Targeting the KCa3.1 channel, a key player in atherosclerosis, with blockers like TRAM-34 significantly reduced plaque development in mice. This approach shows promise for treating cardiovascular disease without compromising immune function.

Area of Science:

  • Cardiovascular Biology
  • Immunology
  • Pharmacology

Background:

  • Atherosclerosis is a leading cause of death globally, with current therapies having limitations.
  • The intermediate-conductance calcium-activated potassium channel KCa3.1 is implicated in atherogenesis and present in key cell types.
  • Elevated KCa3.1 expression is observed in human coronary artery disease and mouse atherosclerosis models.

Purpose of the Study:

  • To investigate the role of KCa3.1 in atherosclerosis development.
  • To evaluate the therapeutic potential of KCa3.1 blockers in preclinical models.

Main Methods:

  • Assessed KCa3.1 expression in human coronary vessels and Apoe(-/-) mouse atherosclerotic lesions.
  • Utilized selective KCa3.1 blockers (TRAM-34, clotrimazole) and gene silencing in vitro and in vivo.
  • Evaluated effects on vascular smooth muscle cell (VSMC) and macrophage function.
  • Assessed atherosclerosis progression in Apoe(-/-) mice treated with KCa3.1 blockers.
  • Examined toxicity and immune response in treated mice.

Main Results:

  • KCa3.1 expression was elevated in atherosclerotic lesions, particularly in VSMCs, macrophages, and T lymphocytes.
  • Pharmacological blockade and gene silencing of KCa3.1 inhibited VSMC proliferation, migration, and oxidative stress.
  • KCa3.1 deficiency reduced VSMC proliferation and macrophage activation.
  • In vivo treatment with TRAM-34 and clotrimazole significantly reduced atherosclerosis in Apoe(-/-) mice.
  • Therapeutic KCa3.1 blockade did not cause discernible toxicity or impair immune response.

Conclusions:

  • KCa3.1 channel activity is a critical driver of atherosclerosis.
  • Selective KCa3.1 blockers effectively inhibit key pathological processes in atherosclerosis.
  • KCa3.1 blockers represent a promising therapeutic strategy for atherosclerosis with a favorable safety profile.

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