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beta-Amyloid-mediated vasoactivity and vascular endothelial damage
T Thomas1, G Thomas, C McLendon
1Roskamp Laboratories, Institute for Research in Psychiatry, University of South Florida, Tampa, 33613 USA.
Nature
|March 14, 1996
Summary
Beta-amyloid peptide interacts with blood vessel cells, generating excess superoxide radicals. This process may contribute to Alzheimer
Area of Science:
- Neuroscience
- Vascular Biology
- Aging Research
Background:
- Beta-amyloid deposits are observed in aging and Alzheimer's disease (AD).
- The precise role of beta-amyloid in neurodegeneration remains unclear.
- The free-radical theory of aging suggests a link between free radicals and AD-type degeneration.
Purpose of the Study:
- To investigate the relationship between free-radical generation and beta-amyloid.
- To elucidate the mechanism by which beta-amyloid may contribute to neurodegeneration.
Main Methods:
- Studied the interaction of beta-amyloid with endothelial cells.
- Assessed the production of superoxide radicals and its effects on endothelial structure and function.
- Evaluated the protective effects of superoxide dismutase.
Main Results:
- Beta-amyloid was shown to interact with endothelial cells, leading to excess superoxide radical production.
- Superoxide radicals scavenged endothelium-derived relaxing factor, causing oxidative damage and lipid peroxidation.
- Superoxide dismutase prevented alterations in vascular tone and endothelial damage.
Conclusions:
- Beta-amyloid may have a normal vasoactive role.
- Beta-amyloid contributes to free-radical-mediated vascular abnormalities and neurodegeneration.
- Targeting free-radical damage could be a therapeutic strategy for AD.