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Oxidized CaMKII causes cardiac sinus node dysfunction in mice.

Paari Dominic Swaminathan1, Anil Purohit, Siddarth Soni

  • 1Division of Cardiovascular Medicine, Department of Internal Medicine, Carver College of Medicine, University of Iowa, Iowa City, Iowa, USA.

The Journal of Clinical Investigation
|July 26, 2011
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Summary
This summary is machine-generated.

Oxidized calmodulin kinase II (ox-CaMKII) is a biomarker and driver of sinus node dysfunction (SND). Inhibiting ox-CaMKII may prevent SND, a condition linked to sudden cardiac death.

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Area of Science:

  • Cardiology
  • Molecular Biology
  • Biochemistry

Background:

  • Sinus node dysfunction (SND) is a significant public health concern linked to sudden cardiac death.
  • SND often occurs with heart failure and hypertension, conditions associated with elevated angiotensin II (Ang II) and oxidative stress.
  • The precise molecular mechanisms underlying SND remain poorly understood.

Purpose of the Study:

  • To investigate the role of oxidized calmodulin kinase II (ox-CaMKII) in the pathogenesis of SND.
  • To identify potential therapeutic targets for preventing SND.

Main Methods:

  • Utilized patient and animal models (dogs and mice) to study SND.
  • Measured ox-CaMKII levels as a biomarker.
  • Investigated the effects of Ang II infusion, NADPH oxidase activation, and CaMKII inhibition on sinoatrial node (SAN) cells.
  • Employed a computational model of the SAN to simulate cell loss and impulse propagation.

Main Results:

  • Oxidized calmodulin kinase II (ox-CaMKII) was identified as both a biomarker and a determinant of SND in patients and dogs.
  • Angiotensin II infusion induced oxidative stress in SAN cells via NADPH oxidase, leading to ox-CaMKII accumulation, apoptosis, and SND in mice.
  • Mice lacking NADPH oxidase or with CaMKII inhibition exhibited resistance to SAN apoptosis and SND.
  • Computational modeling indicated that a critical loss of SAN cells precipitates SND.

Conclusions:

  • Ox-CaMKII plays a crucial role in Ang II-induced SAN cell death and the development of SND.
  • Targeted inhibition of CaMKII presents a potential therapeutic strategy for preventing SND in at-risk individuals.