The surface of cerebral blood vessels is covered nearly entirely by astrocyte processes called endfeet. Astrocytic endfeet are perfectly positioned to interact with the endothelial vessel walls, and, where present, the surrounding smooth muscles or pericytes. Through the release of vasoactive molecules such as PGE2, astrocytes regulate local blood flow (functional hyperemia) and through the release of angiogenic signals induce tight junction proteins that form the blood brain barrier (BBB). Consequently, any condition that compromises the structure or function of the endfoot can cause impaired blood flow or impairments of the BBB. In a previous study using a model of familial Alzheimer disease (AD; hAPPJ202), we1 showed vascular amyloid deposits aggregating between the astrocytic endfeet and the vessel wall and such amyloid laden vessels showed an impaired ability to regulate vascular tone and blood flow upon stimulation. Preliminary data suggests that where amyloid deposits are present on vessels and endfeet displaced, focal breaches in the BBB occur. However, the causative role of vascular amyloid versus structural and functional changes of astrocytic endfeet in this context are not known. Indeed, while reduced blood flow and weakening of the BBB have been demonstrated with aging, the specific role of astrocytes in vessel health over the lifespan are largely unknown. We hypothesize that normal aging is associated with progressive dysfunction of astrocytic endfeet causing impairment in functional hyperemia and gradual weakening of the BBB. These agerelated impairments are accelerated in the AD brain as a function of amyloid being functionally ?toxic? to astrocytes and/or pericytes. Here we propose to use two genetic mouse model of familial AD (hAPPJ202, APP233) with robust vascular amyloidosis1,4 and progressive gliosis1, and age matched control animals to study the specific role of astrocytes and pericytes to maintain vessel health and function during normal and pathological aging. No prior studies have examined specific functional impairments of astrocyte endfeet in normal aging compared to AD, and a possible specific gliotoxic effect of amyloid; two conceptually innovative ideas. State of the art chronic in vivo multi-photon imaging will be applied to well established transgenic mouse models of AD with vascular amyloidosis. Combined with novel cell-type specific genomics and proteomics, this proposal will shed light on astrocyte specific changes in gene and protein expression over the time course of AD (and normal aging) with specific analysis of gender differences.

Public Health Relevance

Cerebral blood vessels are completely covered by astrocytic processes called endfeet. Recent research shows endfeet releasing vasoactive molecules that regulate blood flow and tropic molecules that induce and maintain the blood brain barrier. It is unknown whether these functions change with aging and may be worsened by the presence of amyloid in Alzheimer disease.

Agency
National Institute of Health (NIH)
Institute
National Institute on Aging (NIA)
Type
Research Project (R01)
Project #
1R01AG065836-01
Application #
9866777
Study Section
Brain Injury and Neurovascular Pathologies Study Section (BINP)
Program Officer
Dibattista, Amanda
Project Start
2020-03-01
Project End
2024-12-31
Budget Start
2020-03-01
Budget End
2020-12-31
Support Year
1
Fiscal Year
2020
Total Cost
Indirect Cost
Name
Virginia Polytechnic Institute and State University
Department
Neurosciences
Type
Schools of Arts and Sciences
DUNS #
003137015
City
Blacksburg
State
VA
Country
United States
Zip Code
24061