Related Experiment Videos
Cerebrovasculature-mediated neuronal cell death
P Grammas1, U Reimann-Philipp, P H Weigel
1Department of Pathology, University of Oklahoma Health Sciences Center, Oklahoma City 73104, USA.
Annals of the New York Academy of Sciences
|May 20, 2000
Summary
Alzheimer's disease (AD) brain microvessels produce neurotoxins like nitric oxide, causing neuronal cell death. This suggests a novel vascular mechanism contributing to AD pathogenesis.
Area of Science:
- Neuroscience
- Vascular Biology
- Alzheimer's Disease Research
Background:
- Alzheimer's disease (AD) is increasingly linked to vascular disease.
- The ApoE genotype is a risk factor for both coronary artery disease and AD.
- Brain microvessels may contribute to AD pathogenesis by releasing neurotoxic factors.
Purpose of the Study:
- To investigate if Alzheimer's disease (AD) brain microvessels produce neurotoxic factors.
- To determine if AD microvessels can cause neuronal cell death in vitro.
- To explore the role of cerebral microvasculature in AD pathogenesis.
Main Methods:
- Microvessels were isolated from the cerebral cortices of AD patients and age-matched controls.
- Neurotoxicity was assessed by co-culturing microvessels with primary neurons (rat and human).
- Levels of nitric oxide and the effect of cycloheximide on protein synthesis were measured.
Main Results:
- Microvessels from AD brains produced significantly higher levels of nitric oxide compared to controls.
- AD microvessels induced dose-dependent neuronal cell death in co-culture experiments.
- Inhibition of protein synthesis in AD microvessels reduced their neurotoxic effect, indicating a protein-based toxin.
Conclusions:
- Cerebral microvessels in Alzheimer's disease (AD) patients produce neurotoxic factors.
- These factors, including nitric oxide, contribute to neuronal injury and cell death.
- Vascular-mediated neuronal damage represents a novel mechanism in AD pathogenesis.