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Sealing one's fate: control of cell death in neurons
1Department of Cell Biology, Harvard Medical School, Boston, Massachusetts 02115, USA. bergeron@bcmp.med.harvard.edu
Abstract:
BCL-2 family members and caspases are essential components of the death machinery in neurons. Identification of Apaf-1 as the mammalian homologue of Caenorhabditis elegans ced-4 provided the final proof of the complete conservation of the C. elegans programmed cell death pathway in mammals. When neurons are deprived of trophic factors, a sequence of events is initiated, which includes a reduction in macromolecule synthesis, elevation of c-Jun and cyclin D1, and activation of BAX. The final episode of this sequence is the activation of caspases, which may mark the death commitment point at which neurons cannot be rescued by addition of trophic factors. In addition, recent evidence suggests that the components in the developmental programmed cell death pathway may play a critical role in neurodegenerative disorders.
Insights
Programmed cell death in neurons involves BCL-2 family members and caspases. This pathway, conserved from C. elegans, is crucial for neuroprotection and implicated in neurodegenerative disorders.
Area of Science:
- Neuroscience
- Cell Biology
- Molecular Biology
Background:
- The programmed cell death pathway in neurons is mediated by BCL-2 family members and caspases.
- Apaf-1 has been identified as the mammalian homologue of C. elegans ced-4, confirming pathway conservation.
- This pathway is critical for neuronal survival and implicated in neurodegenerative diseases.
Purpose of the Study:
- To elucidate the molecular mechanisms of programmed cell death in neurons.
- To highlight the conservation of the cell death pathway between mammals and C. elegans.
- To explore the role of developmental programmed cell death components in neurodegenerative disorders.
Main Methods:
- The study reviews existing literature and evidence on neuronal cell death pathways.
- It focuses on the molecular players including BCL-2 family members, caspases, and Apaf-1.
- The research examines the sequence of events leading to neuronal death upon trophic factor deprivation.
Main Results:
- Neuronal death involves a cascade initiated by trophic factor deprivation, including reduced macromolecule synthesis, elevated c-Jun and cyclin D1, and BAX activation.
- Caspase activation signifies a point of no return for neuronal rescue.
- Components of the developmental programmed cell death pathway are increasingly recognized for their role in neurodegeneration.
Conclusions:
- The mammalian programmed cell death pathway is conserved from C. elegans, involving key proteins like Apaf-1.
- Neuronal death commitment occurs upon caspase activation following a cascade of molecular events.
- Understanding this pathway is vital for addressing neurodegenerative disorders.