Cited by 85Intracerebral and Subarachnoid Hemorrhage ResearchCerebrovascular and genetic disordersBarrier Structure and Function Studies

Blood-Brain Barrier Leakage and Microvascular Lesions in Cerebral Amyloid Angiopathy

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Freeze, Whitney M., Bacskai, Brian J., Frosch, Matthew P., Jacobs, Heidi I.L., Backes, Walter H., Greenberg, Steven M., van Veluw, Susanne J.·2019·Stroke

Abstract

Background and Purpose—: Cerebral amyloid angiopathy (CAA) is a common small vessel disease that independently effects cognition in older individuals. The pathophysiology of CAA and CAA-related bleeding remains poorly understood. In this postmortem study, we explored whether blood-brain barrier leakage is associated with CAA and microvascular lesions. Methods—: Eleven CAA cases (median [IQR] age=69 years [65–79 years], 8 males) and 7 cases without neurological disease or brain lesions (median [IQR] age=77 years [68–92 years], 4 males) were analyzed. Cortical sections were sampled from each lobe, and IgG and fibrin extravasation (markers of blood-brain barrier leakage) were assessed with immunohistochemistry. We hypothesized that IgG and fibrin extravasation would be increased in CAA cases compared with controls, that this would be more pronounced in parietooccipital brain regions compared with frontotemporal brain regions in parallel with the posterior predilection of CAA, and would be associated with CAA severity and number of cerebral microbleeds and cerebral microinfarcts counted on ex vivo magnetic resonance imaging of the intact brain hemisphere. Results—: Our results demonstrated increased IgG positivity in the frontotemporal ( P =0.044) and parietooccipital ( P =0.001) cortex in CAA cases compared with controls. Within CAA cases, both fibrin and IgG positivity were increased in parietooccipital brain regions compared with frontotemporal brain regions ( P =0.005 and P =0.006, respectively). The percentage of positive vessels for fibrin and IgG was associated with the percentage of amyloid-β–positive vessels (Spearman ρ=0.71, P =0.015 and Spearman ρ=0.73, P =0.011, respectively). Moreover, the percentage of fibrin and IgG-positive vessels, but not amyloid-β–positive vessels, was associated with the number of cerebral microbleeds on magnetic resonance imaging (Spearman ρ=0.77, P =0.005 and Spearman ρ=0.70, P =0.017, respectively). Finally, we observed fibrin deposition in walls of vessels involved in cerebral microbleeds. Conclusions—: Our results raise the possibility that blood-brain barrier leakage may be a contributory mechanism for CAA-related brain injury.

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Authors
Freeze, W. M., Bacskai, B. J., Frosch, M. P., Jacobs, H. I. L., Backes, W. H., Greenberg, S. M., & van Veluw, S. J.
Affiliations
  • Harvard University (US)
  • Massachusetts General Hospital (US)
  • Maastricht University Medical Centre (NL)
  • MassGeneral Institute for Neurodegenerative Disease (MIND), Massachusetts General Hospital, Charlestown (W.M.F., B.J.B., M.P.F., S.J.v.V.)
Venue
Stroke
Published
2019-02
Volume
50
Issue
2
Pages
328-335
ISSN
  • 0039-2499 (ISSN-L)
  • 1524-4628
OpenAlex
W2911060979
Cited by
85
References
37
Citations by year
2026: 9 · 2025: 8 · 2024: 6 · 2023: 7 · 2022: 14 · 2021: 20 · 2020: 17 · 2019: 4
FWCI
9.31
Type
journal article
Language
en
Open access
Locations
  • Stroke (publishedVersion)
  • PubMed (publishedVersion)
  • Research Publications (Maastricht University) (publishedVersion, other-oa)
  • PubMed Central (acceptedVersion)
  • Leiden Repository (Leiden University) (submittedVersion, cc-by)
  • Research Publications (Maastricht University) (submittedVersion, other-oa)
Funders
  • National Institute on Aging (P30AG062421)
  • National Institute of Neurological Disorders and Stroke (RF1NS110054, R01NS096730)
Topics
  • Health Sciences › Medicine › Neurology › Intracerebral and Subarachnoid Hemorrhage Research
  • Health Sciences › Medicine › Neurology › Cerebrovascular and genetic disorders
  • Life Sciences › Neuroscience › Neurology › Barrier Structure and Function Studies
Keywords
cerebral amyloid angiopathy, blood-brain barrier disruption, IgG extravasation, fibrin deposition, cerebral microbleeds, cerebral microinfarcts, cerebral small vessel disease, postmortem brain, frontotemporal cortex, intracerebral hemorrhage
MeSH terms
Aged, Aged, 80 and over, Autopsy, Blood Proteins, Blood-Brain Barrier, Capillary Permeability, Cerebral Cortex, Exudates and Transudates, Female, Fibrin, Humans, Immunoglobulin G, Magnetic Resonance Imaging, Male, Amyloid beta-Peptides, Cerebral Amyloid Angiopathy, Microvessels, Neuroimaging

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