Calcium overload-induced arrhythmia is suppressed by farnesol in rat heart

Area of Science:

• Cardiovascular Pharmacology
• Electrophysiology
• Natural Product Chemistry

Background:

• Cardiac arrhythmias are a major cause of sudden cardiac death, necessitating novel therapeutic strategies with improved safety profiles.
• Farnesol, a component of essential oils, possesses known antioxidant, anti-inflammatory, and cardioprotective properties.

Purpose of the Study:

• To investigate the antiarrhythmic potential of farnesol.
• To evaluate the effects of farnesol on cardiac contractile and electrophysiological properties in rat models.

Main Methods:

• Assessment of left ventricular developed pressure, electrocardiogram (ECG), and action potentials.
• Electrophysiological studies including potassium (I_K) and L-type Ca²⁺ currents (I_Ca,L) measurement.
• Evaluation of intracellular Ca²⁺ handling (transients, sparks, waves) and reactive oxygen species (ROS) production in isolated cardiomyocytes and in vivo/ex vivo arrhythmia models.

Main Results:

• Farnesol (50 μM) did not significantly affect left ventricular developed pressure, heart rate, ECG parameters, or intracellular Ca²⁺ transients.
• Farnesol reduced L-type Ca²⁺ currents (I_Ca,L) and action potential duration, and attenuated reactive oxygen species generation and abnormal Ca²⁺ handling (sparks and waves).
• Farnesol significantly improved arrhythmia scores and reduced the incidence of severe arrhythmias in experimental models.

Conclusions:

• Farnesol exhibits significant antiarrhythmic activity.
• The antiarrhythmic mechanism involves the reduction of I_Ca,L and I_K, decreased reactive oxygen species production, and normalization of intracellular Ca²⁺ handling.
• Farnesol represents a promising therapeutic agent for managing cardiac arrhythmias.