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Amyloid beta peptide-induced cerebral endothelial cell death involves mitochondrial dysfunction and caspase
1Department of Neurology and Center for the Study of Nervous System Injury, Washington University School of Medicine, St. Louis, Missouri, USA.
Summary
Amyloid beta peptides induce brain endothelial cell death via apoptosis. This process involves oxidative stress, caspase activation, and DNA damage, contributing to neurodegeneration.
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Background:
- Amyloid beta (A beta) peptides, fragments of beta-amyloid precursor protein (betaAPP), aggregate in neurofibrillary tangles and vascular plaques.
- A beta's cytotoxicity is implicated in neuronal and vascular degeneration, particularly in plaque-prone brain regions.
Purpose of the Study:
- To investigate the cytotoxic mechanism of A beta peptides on cerebral endothelial cells (CECs).
- To elucidate the cellular and molecular pathways involved in A beta-induced CEC death.
Main Methods:
- Utilized a murine CEC line and primary bovine CEC cultures.
- Administered A beta 1-40 and A beta 25-35 peptides at varying concentrations and durations.
- Assessed cell death, nuclear condensation, mitochondrial function, DNA damage, and caspase activation.
Main Results:
- A beta 1-40 and A beta 25-35 induced dose- and time-dependent CEC death (≥40% at 10 µmol/L for 48 hours).
- Characterized CEC death by nuclear condensation, mitochondrial dysfunction, and DNA damage (nuclear and mitochondrial).
- Observed caspase-8 and caspase-3 activation by A beta 25-35, which was inhibited by zVAD-fmk.
- Demonstrated that the antioxidant N-acetyl-cysteine prevented A beta-induced cell death.
Conclusions:
- A beta-mediated CEC death is an apoptotic process.
- This apoptosis is driven by increased oxidative stress, caspase activation, mitochondrial dysfunction, and DNA damage.
- These findings highlight A beta's role in vascular pathology relevant to neurodegenerative diseases.