Changes in Cerebrovascular Function with Aging in Normal and AD Brain

正常脑和 AD 脑中脑血管功能随衰老的变化

基本信息

  • 批准号:
    10334548
  • 负责人:
  • 金额:
    $ 48.58万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
  • 财政年份:
    2020
  • 资助国家:
    美国
  • 起止时间:
    2020-03-01 至 2024-12-31
  • 项目状态:
    已结题

项目摘要

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.
脑血管表面几乎完全被称为终足的星形胶质突起覆盖。星形

项目成果

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HARALD W SONTHEIMER其他文献

HARALD W SONTHEIMER的其他文献

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{{ truncateString('HARALD W SONTHEIMER', 18)}}的其他基金

Role of Perineuronal Nets in Epilepsy
神经周围网在癫痫中的作用
  • 批准号:
    10516038
  • 财政年份:
    2021
  • 资助金额:
    $ 48.58万
  • 项目类别:
Role of Perineuronal Nets in Epilepsy
神经周围网在癫痫中的作用
  • 批准号:
    10308419
  • 财政年份:
    2021
  • 资助金额:
    $ 48.58万
  • 项目类别:
Role of Perineuronal Nets in Epilepsy
神经周围网在癫痫中的作用
  • 批准号:
    10404250
  • 财政年份:
    2021
  • 资助金额:
    $ 48.58万
  • 项目类别:
Changes in Cerebrovascular Function with Aging in Normal and AD Brain
正常脑和 AD 脑中脑血管功能随衰老的变化
  • 批准号:
    10543141
  • 财政年份:
    2020
  • 资助金额:
    $ 48.58万
  • 项目类别:
Changes in Cerebrovascular Function with Aging in Normal and AD Brain
正常脑和 AD 脑中脑血管功能随衰老的变化
  • 批准号:
    10438950
  • 财政年份:
    2020
  • 资助金额:
    $ 48.58万
  • 项目类别:
Regulation of Amino-acid Transport in Human Gliomas
人类神经胶质瘤中氨基酸运输的调节
  • 批准号:
    10393364
  • 财政年份:
    2018
  • 资助金额:
    $ 48.58万
  • 项目类别:
Regulation of Amino-acid Transport in Human Gliomas
人类神经胶质瘤中氨基酸运输的调节
  • 批准号:
    10064133
  • 财政年份:
    2018
  • 资助金额:
    $ 48.58万
  • 项目类别:
Regulation of Amino-acid Transport in Human Gliomas
人类神经胶质瘤中氨基酸运输的调节
  • 批准号:
    10321925
  • 财政年份:
    2018
  • 资助金额:
    $ 48.58万
  • 项目类别:
Regulation of Amino-acid Transport in Human Gliomas
人类神经胶质瘤中氨基酸运输的调节
  • 批准号:
    10520044
  • 财政年份:
    2018
  • 资助金额:
    $ 48.58万
  • 项目类别:
Amino Acid Transport and the Biology of Human Gliomas
氨基酸转运和人类神经胶质瘤的生物学
  • 批准号:
    9131426
  • 财政年份:
    2015
  • 资助金额:
    $ 48.58万
  • 项目类别:

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