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Published on: February 3, 2017
Targeting cell death in dementia
1Wolfson Centre for Age-related Disorders, King's College London, London, UK. paul.francis@kcl.ac.uk
Insights
Alzheimer disease (AD) and vascular dementia (VaD) both involve neuronal degeneration. Despite different triggers, common downstream cell death pathways offer targets for neuroprotective agents in both neurodegenerative diseases.
Area of Science:
- Neuroscience
- Pathology
- Neurology
Background:
- Neuronal degeneration is central to Alzheimer disease (AD) and vascular dementia (VaD).
- AD pathogenesis involves beta-amyloid and neurofibrillary tangles (NFTs).
- VaD results from ischemic events (hemorrhage, hypoperfusion) causing oxygen and glucose deprivation.
Purpose of the Study:
- To compare the neurodegenerative pathways in AD and VaD.
- To identify common downstream mechanisms of cell death.
- To explore potential therapeutic targets for neuroprotection.
Main Methods:
- Comparative analysis of neurodegenerative processes in AD and VaD.
- Identification of shared molecular pathways mediating neuronal cell death.
- Review of potential intervention points for neuroprotective strategies.
Main Results:
- AD and VaD exhibit distinct initial triggers and vulnerable neuronal populations.
- Significant overlap exists in the downstream pathways leading to cell death.
- Common cytotoxic pathways present multiple targets for neuroprotective agents.
Conclusions:
- Despite differing etiologies, AD and VaD share common neurodegenerative pathways.
- Targeting these shared pathways offers a promising strategy for developing neuroprotective therapies.
- Further research into these common mechanisms could lead to effective treatments for both conditions.
Abstract:
Neuronal degeneration is a key feature of both Alzheimer disease (AD) and vascular dementia (VaD). Although the exact cause(s) of neurodegeneration in AD is uncertain, strong candidates are beta-amyloid and neurofibrillary tangles (NFT) within neurons. VaD arises as a consequence of ischemic insults such as hemorrhage and hypoperfusion that trigger neurodegeneration by depriving the cells of oxygen and glucose. The initial insults in AD and VaD result in regional differences in the pattern of neurodegeneration, with cholinergic and glutamatergic neurons being particularly vulnerable in AD, and neurons of whatever neurochemical phenotype close to the vascular insult being more at risk of death in VaD. Although the initial trigger of neurodegeneration and the population of neurons affected differ in AD and VaD, there is considerable overlap in the downstream pathways that mediate cell death. As a consequence there are, therefore, a number of levels in the cytotoxic pathway common to AD and VaD at which a neuroprotective agent might be targeted.
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