期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 101, 期 7, 页码 2070-2075出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0305799101
关键词
amyloid; apoptosis; hippocampus; lipid peroxidation; sphingomyelin
资金
- NIA NIH HHS [P30 AG010161, 1RO3 AG19493-0, P50 AG005146, AG05146, P30 AG10161] Funding Source: Medline
Alzheimer's disease (AD) is an age-related disorder characterized by deposition of amyloid beta-peptide (Abeta) and degeneration of neurons in brain regions such as the hippocampus, resulting in progressive cognitive dysfunction. The pathogenesis of AD is tightly linked to Abeta deposition and oxidative stress, but it remains unclear as to how these factors result in neuronal dysfunction and death. We report alterations in sphingolipid and cholesterol metabolism during normal brain aging and in the brains of AD patients that result in accumulation of long-chain ceramides and cholesterol. Membrane-associated oxidative stress occurs in association with the lipid alterations, and exposure of hippocampal neurons to Abeta induces membrane oxidative stress and the accumulation of ceramide species and cholesterol. Treatment of neurons with alpha-tocopherol or an inhibitor of sphingomyelin synthesis prevents accumulation of ceramides and cholesterol and protects them against death induced by Abeta. Our findings suggest a sequence of events in the pathogenesis of AD in which Abeta induces membrane-associated oxidative stress, resulting in perturbed ceramide and cholesterol metabolism which, in turn, triggers a neurodegenerative cascade that leads to clinical disease.
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