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Perivascular drainage of solutes is impaired in the ageing mouse brain and in the presence of cerebral amyloid angiopathy

Perivascular drainage of solutes is impaired in the ageing mouse brain and in the presence of cerebral amyloid angiopathy
Perivascular drainage of solutes is impaired in the ageing mouse brain and in the presence of cerebral amyloid angiopathy
The deposition of amyloid-? (A?) peptides in the walls of leptomeningeal and cortical blood vessels as cerebral amyloid angiopathy (CAA) is present in normal ageing and the majority of Alzheimer's disease (AD) brains. The failure of clearance mechanisms to eliminate A? from the brain contributes to the development of sporadic CAA and AD. Here, we investigated the effects of CAA and ageing on the pattern of perivascular drainage of solutes in the brains of naïve mice and in the Tg2576 mouse model of AD. We report that drainage of small molecular weight dextran along cerebrovascular basement membranes is impaired in the hippocampal capillaries and arteries of 22-month-old wild-type mice compared to 3- and 7-month-old animals, which was associated with age-dependent changes in capillary density. Age-related alterations in the levels of laminin, fibronectin and perlecan in vascular basement membranes were also noted in wild-type mice. Furthermore, dextran was observed in the walls of veins of Tg2576 mice in the presence of CAA, suggesting that deposition of A? in vessel walls disrupts the normal route of elimination of solutes from the brain parenchyma. These data support the hypothesis that perivascular solute drainage from the brain is altered both in the ageing brain and as a consequence of CAA. These findings have implications for the success of therapeutic strategies for the treatment of AD that rely upon the health of the ageing cerebral vasculature.
Alzheimer’s disease, amyloid-b, cerebral vasculature, perivascular drainage, basement membranes, cerebral amyloid angiopathy
0001-6322
431-443
Hawkes, Cheryl A.
a5bad078-e0fe-462c-989e-f0acd95892de
Härtig, Wolfgang
529bc63c-0f00-42be-b5b1-a22190069787
Kacza, Johannes
de3db15a-845e-4f3a-be03-512f24005c79
Schliebs, Reinhard
16f12c89-05a4-42b8-893a-14471ae88ebd
Weller, Roy O.
4a501831-e38a-4d39-a125-d7141d6c667b
Nicoll, James A.R.
88c0685f-000e-4eb7-8f72-f36b4985e8ed
Carare, Roxana O.
0478c197-b0c1-4206-acae-54e88c8f21fa
Hawkes, Cheryl A.
a5bad078-e0fe-462c-989e-f0acd95892de
Härtig, Wolfgang
529bc63c-0f00-42be-b5b1-a22190069787
Kacza, Johannes
de3db15a-845e-4f3a-be03-512f24005c79
Schliebs, Reinhard
16f12c89-05a4-42b8-893a-14471ae88ebd
Weller, Roy O.
4a501831-e38a-4d39-a125-d7141d6c667b
Nicoll, James A.R.
88c0685f-000e-4eb7-8f72-f36b4985e8ed
Carare, Roxana O.
0478c197-b0c1-4206-acae-54e88c8f21fa

Hawkes, Cheryl A., Härtig, Wolfgang, Kacza, Johannes, Schliebs, Reinhard, Weller, Roy O., Nicoll, James A.R. and Carare, Roxana O. (2011) Perivascular drainage of solutes is impaired in the ageing mouse brain and in the presence of cerebral amyloid angiopathy. Acta Neuropathologica, 121 (4), 431-443. (doi:10.1007/s00401-011-0801-7). (PMID:21259015)

Record type: Article

Abstract

The deposition of amyloid-? (A?) peptides in the walls of leptomeningeal and cortical blood vessels as cerebral amyloid angiopathy (CAA) is present in normal ageing and the majority of Alzheimer's disease (AD) brains. The failure of clearance mechanisms to eliminate A? from the brain contributes to the development of sporadic CAA and AD. Here, we investigated the effects of CAA and ageing on the pattern of perivascular drainage of solutes in the brains of naïve mice and in the Tg2576 mouse model of AD. We report that drainage of small molecular weight dextran along cerebrovascular basement membranes is impaired in the hippocampal capillaries and arteries of 22-month-old wild-type mice compared to 3- and 7-month-old animals, which was associated with age-dependent changes in capillary density. Age-related alterations in the levels of laminin, fibronectin and perlecan in vascular basement membranes were also noted in wild-type mice. Furthermore, dextran was observed in the walls of veins of Tg2576 mice in the presence of CAA, suggesting that deposition of A? in vessel walls disrupts the normal route of elimination of solutes from the brain parenchyma. These data support the hypothesis that perivascular solute drainage from the brain is altered both in the ageing brain and as a consequence of CAA. These findings have implications for the success of therapeutic strategies for the treatment of AD that rely upon the health of the ageing cerebral vasculature.

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More information

Published date: April 2011
Keywords: Alzheimer’s disease, amyloid-b, cerebral vasculature, perivascular drainage, basement membranes, cerebral amyloid angiopathy
Organisations: Clinical Neurosciences

Identifiers

Local EPrints ID: 181829
URI: http://eprints.soton.ac.uk/id/eprint/181829
ISSN: 0001-6322
PURE UUID: c69711b0-a1fa-407d-96b4-d284f042e7d3
ORCID for James A.R. Nicoll: ORCID iD orcid.org/0000-0002-9444-7246
ORCID for Roxana O. Carare: ORCID iD orcid.org/0000-0001-6458-3776

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Date deposited: 19 Apr 2011 10:39
Last modified: 15 Mar 2024 03:13

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Contributors

Author: Cheryl A. Hawkes
Author: Wolfgang Härtig
Author: Johannes Kacza
Author: Reinhard Schliebs
Author: Roy O. Weller

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