Changes in Sympathetic Innervation of the Heart in Rats with Experimental Myocardial Infarction. Effect of Semax

Area of Science:

• Cardiovascular Science
• Neuroscience
• Pharmacology

Background:

• Myocardial infarction (MI) causes significant cardiac remodeling.
• Cardiac sympathetic innervation changes are crucial in post-MI recovery and complications.
• Therapeutic interventions targeting neural remodeling are of great interest.

Purpose of the Study:

• To investigate the impact of the peptide Semax on cardiac sympathetic innervation remodeling following experimental myocardial infarction.
• To assess whether Semax influences the density of β1 and β2 adrenoceptors in the infarcted heart.

Main Methods:

• Experimental myocardial infarction was induced in rats.
• Treatment with the peptide Semax was administered.
• Cardiac sympathetic innervation and adrenoceptor density (β1, β2) were analyzed 28 days post-injury.

Main Results:

• Semax significantly diminished the excessive growth of sympathetic innervation in the ventricular septum of rats with myocardial infarction.
• No significant effect of Semax was observed on the density of β1 and β2 adrenoceptors in the cardiac tissue.

Conclusions:

• The peptide Semax demonstrates a modulatory effect on cardiac sympathetic nerve remodeling after myocardial infarction in rats.
• Semax may offer a therapeutic avenue for managing neural changes post-MI, independent of direct adrenoceptor density modulation.