Pharmacological postconditioning with the phytoestrogen genistein

Area of Science:

• Cardiology
• Pharmacology
• Molecular Biology

Background:

• Estrogens activate the phosphatidyl-inositol 3-kinase (PI3K)/Akt pathway, crucial for cardioprotection during ischemic postconditioning.
• Phytoestrogens, like genistein, are plant-derived compounds with potential therapeutic applications.

Purpose of the Study:

• To investigate if genistein can induce pharmacological postconditioning.
• To explore the underlying mechanisms of genistein's cardioprotective effects.

Main Methods:

• Rabbits underwent coronary artery occlusion followed by reperfusion.
• Genistein or 17beta-estradiol were administered intravenously before reperfusion.
• Infarct size, TUNEL-positive nuclei, Akt phosphorylation, and mitochondrial function were assessed.

Main Results:

• Genistein significantly reduced infarct size and TUNEL-positive nuclei, similar to 17beta-estradiol.
• Cardioprotection was abolished by estrogen receptor and PI3K inhibitors.
• Genistein increased Akt phosphorylation and inhibited mitochondrial transition pore opening.

Conclusions:

• Genistein exerts pharmacological postconditioning, comparable to 17beta-estradiol.
• Its mechanism involves estrogen receptor and PI3K/Akt pathway activation, leading to mitochondrial preservation.
• Genistein should be recognized for its cardioprotective estrogen-like properties beyond tyrosine kinase inhibition.