Ultrafast ROS Scavenging Activity of Amur Maple Tree Extracts Confers Robust Cardioprotection for Myocardial...

Area of Science:

• Pharmacology
• Cardiovascular Research
• Natural Product Chemistry

Background:

• Reactive oxygen species (ROS) significantly worsen secondary damage in myocardial ischemia-reperfusion injury (MIRI).
• Ginnalin A (GA), a compound from amur maple, is a potent ROS scavenger.
• Targeting ROS is crucial for mitigating MIRI-induced cardiac damage.

Purpose of the Study:

• To investigate the cardioprotective effects of GA-enriched amur maple extracts against MIRI.
• To elucidate the mechanism of ROS scavenging by these extracts.
• To evaluate the therapeutic potential of GA extracts in a MIRI rat model.

Main Methods:

• Fractionation of amur maple leaf extracts using dichloromethane (DCM) and ethyl acetate (EA).
• Assessment of cardiomyocyte protection against H2O2-induced damage.
• Measurement of intracellular and mitochondrial ROS levels using ROS-sensitive probes.
• Evaluation of in vivo cardioprotection in a MIRI rat model, including cardiac function and fibrosis assessment.

Main Results:

• DCM- and EA-fractioned GA extracts protected cardiomyocytes from H2O2-induced damage.
• Extracts significantly reduced intracellular and mitochondrial ROS levels.
• GA extracts acted as direct antioxidases, scavenging various ROS within 20 minutes.
• In vivo administration reduced cardiac fibrosis and denatured collagen, preserving viable myocardium and enhancing cardiac function in MIRI rats.

Conclusions:

• Amur maple extracts, rich in Ginnalin A, possess potent and ultrafast ROS scavenging capabilities.
• These extracts offer significant cardioprotection against MIRI by directly neutralizing ROS.
• GA extracts represent a promising pharmacological intervention for mitigating ROS-induced cardiac injury during reperfusion.