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Electromechanical Assessment of Optogenetically Modulated Cardiomyocyte Activity
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Modulation of Redox-Sensitive Cardiac Ion Channels
Razan Orfali1, Al Hassan Gamal El-Din2, Varnika Karthick2
1Department of Pharmacology, College of Medicine, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh 13317, Saudi Arabia.
Antioxidants (Basel, Switzerland)
|July 29, 2025
Summary
Reactive oxygen species (ROS) disrupt heart rhythm by altering ion channel function. Reducing oxidative stress can restore normal cardiac electrical activity and prevent heart disease.
Area of Science:
- Cardiovascular Physiology
- Molecular Cardiology
- Redox Biology
Background:
- Redox regulation is essential for cardiac action potential and excitation-contraction coupling.
- Low levels of reactive oxygen species (ROS) modulate ion channel function, but excessive ROS impair heart function.
Purpose of the Study:
- To investigate the impact of ROS on cardiac ion channels and electrophysiology.
- To explore the therapeutic potential of targeting redox modifications in cardiovascular disease.
Main Methods:
- Utilizing experimental models to study the effects of oxidizing and reducing agents on cardiac ion channel activity.
- Analyzing oxidative modifications of key proteins involved in calcium handling.
Main Results:
- Accumulated ROS reduce potassium currents and enhance sodium and calcium influx in cardiomyocytes.
- Oxidative stress disrupts cardiac rhythm, promotes after-depolarizations, and impairs contractile force.
- Oxidative modifications of calcium-handling proteins increase sarcoplasmic reticulum calcium release and leak.
Conclusions:
- Redox-dependent alterations in cardiac ion channels and calcium handling contribute to cardiovascular dysfunction.
- Targeting redox modifications offers a potential therapeutic strategy for conditions like myocardial infarction and heart failure.
Keywords:
antioxidantscardiomyocytescardiovascular diseasesheart failureion channelskinasemitochondriaoxidative stressreactive oxygen speciesredox signalingMore Related Videos
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