Regional differences in the morphological and functional effects of aging on cerebral basement membranes and perivascular drainage of amyloid‐β from the mouse brain

Aging Cell

Cheryl A. Hawkes²  Maureen Gatherer²  Matthew M. Sharp²  Adrienne Dorr¹  Ho Ming Yuen²  Rajesh Kalaria³  Roy O. Weller² 

[1]Sunnybrook Research Institute, Toronto, Ontario, Canada

[2]Faculty of Medicine, South Lab and Pathology Block, Southampton General Hospital, University of Southampton, Southampton, UK

[3]Centre for Vitality and Ageing, Newcastle University, Newcastle upon Tyne, UK

关键词: aging;    Alzheimer's disease;    basement membranes;    cerebral amyloid angiopathy;    cerebral vasculature;   

DOI  :  10.1111/acel.12045

来源: Wiley

【 摘 要 】

Summary

Development of cerebral amyloid angiopathy (CAA) and Alzheimer's disease (AD) is associated with failure of elimination of amyloid-β (Aβ) from the brain along perivascular basement membranes that form the pathways for drainage of interstitial fluid and solutes from the brain. In transgenic APP mouse models of AD, the severity of cerebral amyloid angiopathy is greater in the cerebral cortex and hippocampus, intermediate in the thalamus, and least in the striatum. In this study we test the hypothesis that age-related regional variation in (1) vascular basement membranes and (2) perivascular drainage of Aβ contribute to the different regional patterns of CAA in the mouse brain. Quantitative electron microscopy of the brains of 2-, 7-, and 23-month-old mice revealed significant age-related thickening of capillary basement membranes in cerebral cortex, hippocampus, and thalamus, but not in the striatum. Results from Western blotting and immunocytochemistry experiments showed a significant reduction in collagen IV in the cortex and hippocampus with age and a reduction in laminin and nidogen 2 in the cortex and striatum. Injection of soluble Aβ into the hippocampus or thalamus showed an age-related reduction in perivascular drainage from the hippocampus but not from the thalamus. The results of the study suggest that changes in vascular basement membranes and perivascular drainage with age differ between brain regions, in the mouse, in a manner that may help to explain the differential deposition of Aβ in the brain in AD and may facilitate development of improved therapeutic strategies to remove Aβ from the brain in AD.

【 授权许可】

Unknown   
© 2013 The Authors Aging Cell © 2013 Blackwell Publishing Ltd/Anatomical Society of Great Britain and Ireland