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Brain microvascular changes in Alzheimer's disease and other dementias
L Buée1, P R Hof, A Delacourte
1INSERM U422, Lille, France. buee@lille.inserm.fr
Abstract:
Vasculopathy in Alzheimer's disease (AD) may represent an important pathogenetic factor of this disorder. In the present study, microvasculature was studied by immunohistochemistry using a monoclonal antibody against a vascular heparan sulfate proteoglycan. Vascular changes were consistently observed in AD and included decrease in vascular density, presence of atrophic and coiling vessels, and glomerular loop formations. The laminar and regional distribution of these vascular alterations was correlated with the presence of neurofibrillary tangles. However, vascular changes may also follow neuronal loss. Vascular density may be related to a decrease in brain metabolism. Furthermore, one of the main features of AD is the presence of amyloid deposits within brain parenchyma and blood vessel walls. It is not yet clear whether amyloid components are derived from the blood or the central nervous system. Because AD is clearly heterogeneous, based on clinical and genetic data, evidence for either a brain or peripheral origin is discussed. Microvasculature was also analyzed in other neurodegenerative disorders devoid of amyloid deposits including amyotrophic lateral sclerosis/parkinsonism-dementia complex of Guam and Pick's disease. In conclusion, if vasculopathy in neurodegenerative disorders is not directly involved in pathogenesis, it may act synergistically with other pathogenetic mechanisms including genetic and environmental factors. This aspect of pathology is particularly interesting in view of its accessibility to therapeutic interventions.
Insights
Alzheimer's disease (AD) involves significant brain vasculopathy, including reduced vascular density and altered vessel structures. These changes correlate with neurofibrillary tangles and may synergize with other factors in neurodegeneration.
Area of Science:
- Neurology
- Pathology
- Neuroscience
Background:
- Vasculopathy is increasingly recognized as a potential pathogenetic factor in Alzheimer's disease (AD).
- Understanding vascular changes in AD is crucial for elucidating disease mechanisms.
- Amyloid deposits are a hallmark of AD, found in both brain parenchyma and vasculature.
Purpose of the Study:
- To investigate microvascular alterations in Alzheimer's disease (AD) using immunohistochemistry.
- To correlate vascular changes with neuropathological hallmarks like neurofibrillary tangles.
- To compare vascular pathology in AD with other neurodegenerative disorders.
Main Methods:
- Immunohistochemistry utilizing a monoclonal antibody against vascular heparan sulfate proteoglycan.
- Analysis of microvasculature in post-mortem brain tissue from AD patients and controls.
- Comparative analysis in neurodegenerative disorders lacking amyloid deposits, such as ALS/PDC and Pick's disease.
Main Results:
- Consistent vascular changes observed in AD: decreased vascular density, atrophic and coiling vessels, and glomerular loop formations.
- Distribution of vascular alterations correlated with neurofibrillary tangles, suggesting a link.
- Vascular changes may also occur secondary to neuronal loss and potentially relate to reduced brain metabolism.
- Amyloid deposition in vessel walls was noted, with ongoing debate regarding its origin (CNS vs. peripheral).
Conclusions:
- Cerebral vasculopathy is a significant feature of Alzheimer's disease, potentially acting synergistically with other pathogenetic factors.
- Vascular alterations in AD may be linked to neurofibrillary tangle presence and neuronal loss.
- The study highlights the potential for therapeutic interventions targeting vascular pathology in neurodegenerative diseases.