Quantitative analysis of apoptotic markers in human end-stage heart failure

Area of Science:

• Cardiology
• Molecular Biology
• Cellular Biology

Background:

• Apoptosis, or programmed cell death, plays a role in cardiac diseases like myocardial infarction and chronic heart failure.
• Quantifying apoptotic markers is crucial for understanding disease progression and identifying therapeutic targets.

Purpose of the Study:

• To quantify apoptotic markers in human end-stage heart failure.
• To correlate these markers with clinical parameters of heart failure.
• To investigate specific protein cleavage and enzyme activity associated with apoptosis.

Main Methods:

• Myocardial tissue samples were collected from 44 end-stage heart failure patients and 5 controls during heart transplantation.
• Lysates were analyzed for cleavage of specific proteins (alpha actin, alpha actinin, troponin T, tropomyosin, MLC-1v, gelsolin).
• Levels of active caspase-3 and DNA-histone fragments were measured.

Main Results:

• Cleavage of alpha actin and alpha actinin was observed.
• Troponin I, tropomyosin, and MLC-1v showed no detectable cleavage.
• Active caspase-3 and DNA-histone fragments were low in end-stage heart failure.
• A significant increase in caspase-3 activity, but not DNA fragmentation, was noted in acutely decompensated heart failure patients.
• No correlation was found between caspase-3 activity, DNA fragmentation, and hemodynamic or echocardiographic variables in the overall group.

Conclusions:

• Apoptosis, indicated by specific protein cleavage and caspase-3 activity, is present in end-stage heart failure.
• Acutely decompensated heart failure is associated with increased caspase-3 activity, suggesting a role in acute cardiac events.
• The lack of correlation with clinical parameters indicates complex apoptotic regulation in heart failure.