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Monitoring Dynamic Changes In Mitochondrial Calcium Levels During Apoptosis Using A Genetically Encoded Calcium Sensor
Published on: April 1, 2011
Calpains, mitochondria, and apoptosis.
Matthew A Smith1, Rick G Schnellmann
1Department of Pharmaceutical and Biomedical Sciences, Center for Cell Death, Injury, and Regeneration, Medical University of South Carolina, 280 Calhoun Street, MSC140, Charleston, SC 29425, USA.
Cardiovascular Research
|May 15, 2012
Summary
Calpains, calcium-activated proteases, significantly impact cardiovascular mitochondrial function and cell death pathways like apoptosis. Understanding calpain roles is crucial for addressing cardiovascular injury and dysfunction.
Area of Science:
- Cardiovascular Biology
- Mitochondrial Medicine
- Cell Death Signaling
Background:
- Mitochondrial dysfunction is a key factor in cardiovascular injury, leading to cell death.
- Calpains are calcium-activated proteases involved in regulating apoptosis and necrosis.
- Existing calpain inhibitors lack specificity, hindering detailed mechanistic studies.
Purpose of the Study:
- To review the multifaceted roles of calpains in modulating mitochondrial function within the cardiovascular system.
- To elucidate the mechanisms by which calpains contribute to apoptosis and necrosis in cardiovascular cells.
- To highlight the need for specific calpain inhibitors for further research.
Main Methods:
- Literature review of studies investigating calpain activity in cardiovascular cells (endothelial cells, cardiomyocytes, renal cells).
- Analysis of research utilizing calpain inhibitors to understand their effects on mitochondrial pathways.
- Examination of calpain substrates and their downstream consequences on cell survival and death.
Main Results:
- Calpain activation, particularly calpain 1, is implicated in mitochondrial calcium overload and subsequent apoptosis via Bid cleavage and cytochrome c release.
- Calpains 1 and 2 contribute to cell death in renal cells by compromising plasma membrane integrity.
- Calpain 10 directly impacts mitochondrial respiration by cleaving electron transport chain proteins, and its dysregulation induces mitochondrial dysfunction and apoptosis.
Conclusions:
- Calpains are critical regulators of mitochondrial function and cell fate in the cardiovascular system.
- Specific calpains play distinct roles in mediating apoptosis and necrosis following cardiovascular injury.
- Further research with specific calpain modulators is essential to fully understand their therapeutic potential.
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