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Amyloid beta precursor protein-mRNA is expressed throughout cerebral vessel walls
R Natté1, W I de Boer, M L Maat-Schieman
1Department of Neurology K5Q, Leiden University Medical Center, P.O. Box 9600, 2300 RC, Leiden, Netherlands. rnatte@path_1.medfac.leidenuniv.nl
Abstract:
To determine the presence and distribution of cerebrovascular Abeta production we investigated amyloid beta precursor protein (AbetaPP)-mRNA expression by RNA in situ hybridization in patients with hereditary cerebral hemorrhage with amyloidosis, Dutch type, Alzheimer disease and controls. In all subjects, AbetaPP-mRNA was expressed in endothelial cells, smooth muscle cells, adventitial cells and brain pericytes and/or perivascular cells. Meningeal cells also expressed AbetaPP-mRNA. AbetaPP was detected in endothelial cells, smooth muscle cells and adventitial cells. The demonstration of AbetaPP-mRNA at all vascular sites where amyloid formation can occur supports an important contribution of locally derived Abeta to cerebrovascular amyloidosis.
Insights
Researchers studied amyloid beta precursor protein (AbetaPP)-mRNA in brain blood vessels to understand amyloidosis. AbetaPP-mRNA was found in various vascular cells, supporting local Abeta production in cerebrovascular amyloidosis.
Area of Science:
- Neuroscience
- Molecular Biology
- Pathology
Background:
- Cerebrovascular amyloidosis is a significant factor in neurological diseases.
- The origin of amyloid beta (Abeta) in cerebral vasculature is not fully understood.
- Amyloid beta precursor protein (AbetaPP) is the source of Abeta.
Purpose of the Study:
- To investigate the presence and distribution of AbetaPP-mRNA in the cerebrovasculature.
- To determine if local Abeta production contributes to cerebrovascular amyloidosis.
- To compare AbetaPP-mRNA expression in patients with hereditary cerebral hemorrhage with amyloidosis (Dutch type), Alzheimer disease, and controls.
Main Methods:
- RNA in situ hybridization was used to detect AbetaPP-mRNA expression.
- Analysis was performed on brain tissue samples from patients and controls.
- Immunohistochemistry was used to detect AbetaPP protein.
Main Results:
- AbetaPP-mRNA was expressed in endothelial cells, smooth muscle cells, adventitial cells, and perivascular cells in all subjects.
- Meningeal cells also showed AbetaPP-mRNA expression.
- AbetaPP protein was detected in endothelial cells, smooth muscle cells, and adventitial cells.
Conclusions:
- The widespread expression of AbetaPP-mRNA in cerebrovascular cells supports local Abeta production.
- These findings suggest a significant contribution of locally derived Abeta to the development of cerebrovascular amyloidosis.
- Understanding local Abeta production is crucial for developing targeted therapies for amyloidosis.