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Caspase requirement for neuronal apoptosis and neurodegeneration
1Molecular Toxicology, Faculty of Biology, University of Konstanz, Germany. Pierluigi.Nicotera@uni-konstanz.de
Abstract:
The execution of the apoptotic programme involves a relatively few pathways that converge on activation of the caspase family of proteases. However, increasing evidence indicates that apoptotic-like features can be found also when cells are treated with inhibitors of caspases. This has posed questions as to whether death with apoptotic features can still occur in a caspase-independent way, and whether caspase inhibitors may then be used to prevent excess apoptosis in disease. Metabolic defects, loss of neuronal connectivity and cell loss characterise several neurodegenerative diseases. Targeting excessive cell demise may be one therapeutic strategy. However, loss of connectivity and neurite regression may not be part of the apoptotic programme, and degenerating neurons might use multiple execution pathways. In addition, metabolic defects leading to ATP depletion can preclude caspase activation and consequently switch execution of cell death towards necrosis. The possibility of inhibiting apoptosis as strategy to treat neurodegenerative disease is discussed in this review.
Insights
This review explores caspase-independent cell death pathways, questioning if apoptosis inhibitors can treat neurodegenerative diseases by preventing excessive cell death.
Area of Science:
- Cell Biology
- Neuroscience
- Biochemistry
Background:
- Apoptosis, or programmed cell death, typically involves caspases.
- However, cells exhibit apoptotic features even with caspase inhibitors, suggesting alternative pathways.
- Neurodegenerative diseases involve neuronal loss, connectivity issues, and metabolic defects.
Purpose of the Study:
- To review the evidence for caspase-independent cell death.
- To discuss the implications for treating neurodegenerative diseases.
- To evaluate the potential of targeting apoptosis for therapeutic benefit.
Main Methods:
- Literature review of studies on apoptosis and caspase inhibitors.
- Analysis of cell death mechanisms in neurodegenerative conditions.
- Discussion of metabolic defects and ATP depletion's role in cell death.
Main Results:
- Apoptotic-like cell death can occur independently of caspases.
- Metabolic defects, like ATP depletion, can shift cell death towards necrosis.
- Neuronal degeneration may involve multiple cell death execution pathways.
Conclusions:
- Caspase inhibitors may not universally prevent cell death in neurodegenerative diseases.
- Understanding diverse cell death pathways is crucial for developing effective therapies.
- Targeting apoptosis alone may be insufficient for treating complex neurodegenerative disorders.