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Apoptosis and oxidants in the heart
Dinender Kumar1, Bodh I Jugdutt
1Division of Cardiology, Department of Medicine and Cardiovascular Research Group, Faculty of Medicine, University of Alberta. dxk@medicind.wisc.edu
The Journal of Laboratory and Clinical Medicine
|December 4, 2003
Summary
Cardiomyocyte apoptosis, driven by oxidative stress and reactive oxygen species (ROS), contributes to heart disease. While antioxidants can inhibit this process, the accuracy of apoptosis detection methods like TUNEL assay requires further validation.
Area of Science:
- Cardiovascular Biology
- Cell Death Research
- Oxidative Stress Mechanisms
Background:
- Cardiomyocyte (CM) apoptosis is observed in various cardiovascular diseases.
- Reactive oxygen species (ROS) are implicated in cardiac pathophysiology and can induce CM apoptosis.
- The precise role of CM apoptosis in cardiac disease progression warrants further investigation.
Purpose of the Study:
- To review the role of cardiomyocyte apoptosis in cardiovascular diseases.
- To explore the mechanisms by which ROS induce CM apoptosis.
- To discuss the limitations of current methods for detecting CM apoptosis, particularly the TUNEL assay.
Main Methods:
- Literature review and synthesis of existing evidence on CM apoptosis.
- Analysis of the role of ROS and oxidative stress in CM cell death pathways.
- Evaluation of the sensitivity and specificity concerns associated with the TUNEL assay for CM apoptosis detection.
Main Results:
- Oxidative stress and ROS up-regulate proapoptotic proteins (Bax, caspases) and activate the mitochondria-dependent pathway, leading to CM apoptosis.
- Antioxidants and overexpression of antiapoptotic proteins (Bcl-2) can inhibit ROS-induced CM apoptosis.
- Concerns regarding the sensitivity and specificity of the TUNEL assay question previous findings on the percentage of apoptotic CMs in the heart.
Conclusions:
- Oxidative stress is a significant stimulus for CM apoptosis in cardiovascular diseases.
- Antioxidant interventions show potential for inhibiting CM apoptosis both in vitro and in vivo.
- Further research is needed to refine methods for accurate CM apoptosis detection and to fully elucidate its role in cardiac pathology.
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