Cortistatin Improves Cardiac Function After Acute Myocardial Infarction in Rats by Suppressing Myocardial Apoptosis...

Area of Science:

• Cardiovascular Research
• Cellular Biology
• Molecular Medicine

Background:

• Endoplasmic reticulum (ER) stress is implicated in acute myocardial infarction (AMI) pathogenesis.
• Cortistatin (CST) is a peptide known to inhibit apoptosis-related injury.

Purpose of the Study:

• To investigate the cardioprotective effects of CST in a rat model of AMI.
• To elucidate the underlying mechanisms of CST's action, focusing on ER stress and apoptosis.

Main Methods:

• Male Wistar rats underwent sham surgery, induced AMI, or AMI with CST treatment.
• Cardiac function, infarct size, and myocardial apoptosis were assessed.
• Expression of CST, ER stress markers (GRP94, GRP78, CHOP, caspase 12), and apoptosis markers (caspase 3, Bax, Bcl-2) were analyzed.

Main Results:

• CST treatment improved cardiac function and reduced infarct size compared to the AMI group.
• Myocardial apoptosis was confirmed in AMI rats and significantly reduced by CST.
• CST suppressed ER stress markers and modulated apoptotic protein expression, decreasing proapoptotic factors (caspase 3, Bax) and increasing antiapoptotic factor (Bcl-2).

Conclusions:

• Exogenous CST demonstrates significant cardioprotective effects in AMI.
• CST mitigates myocardial damage by suppressing ER stress and inhibiting apoptosis.