Dunye Guanxinning Improves Acute Myocardial Ischemia-Reperfusion Injury by Inhibiting Neutrophil Infiltration and...

Area of Science:

• Cardiovascular Disease Research
• Traditional Chinese Medicine Pharmacology
• Inflammation and Immunity

Background:

• Acute myocardial infarction (AMI) is a critical cardiovascular condition with significant mortality.
• Dunye Guanxinning (DG), a traditional Chinese patent medicine, shows clinical efficacy in treating myocardial infarction.
• The precise mechanism underlying DG's cardioprotective effects remains largely unelucidated.

Purpose of the Study:

• To investigate the protective mechanism of Dunye Guanxinning (DG) in acute myocardial ischemia-reperfusion injury.
• To test the hypothesis that DG inhibits neutrophil infiltration and caspase-1 activity.
• To explore the role of the adenosine monophosphate-activated protein kinase (AMPK) pathway in DG's action.

Main Methods:

• Administration of DG to rats subjected to myocardial ischemia-reperfusion injury.
• Assessment of cardiac function, infarct size, and cardiomyocyte apoptosis.
• Measurement of hemorheological parameters, oxidative stress markers, and inflammatory cytokines (IL-1β).
• Evaluation of neutrophil infiltration, caspase-1 activity, and AMPK phosphorylation.

Main Results:

• DG administration significantly reduced infarct size and cardiomyocyte apoptosis.
• Improved cardiac function, including left ventricular ejection fraction and fractional shortening.
• DG inhibited neutrophil infiltration, reduced serum IL-1β levels, and suppressed myocardial IL-1β maturation.
• DG inhibited caspase-1 activity and promoted AMPK phosphorylation in the heart.

Conclusions:

• DG demonstrates significant cardioprotective effects against ischemia-reperfusion injury in a rat model.
• DG exerts its benefits by inhibiting inflammasome activity and IL-1β release, partly through the AMPK pathway.
• These findings provide mechanistic insights supporting the clinical use of DG for myocardial infarction treatment.