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Role of BACE in the pathogenesis of Alzheimer's disease after head trauma

BACE 在头部外伤后阿尔茨海默病发病机制中的作用

基本信息

批准号：
9038023
负责人：
GIUSEPPINA TESCO
金额：
$ 36.09万
依托单位：
TUFTS UNIVERSITY BOSTON
依托单位国家：
美国
项目类别：
财政年份：
2015
资助国家：
美国
起止时间：
2015-09-01 至 2019-08-31
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/9038023
关键词：
Acute Affect Alanine Alzheimer&apos s Disease Amygdaloid structure Amyloid beta-Protein Amyloid deposition Animal Model Animals Anti-Anxiety Agents Anxiety Aspartate Behavior Behavioral Binding Proteins Biochemical Brain Brain region Caspase Cerebral Ischemia Complex Craniocerebral Trauma Development Disease Ear Ectopic Expression Environment Environmental Risk Factor Enzymes Event Fright Generations Genes Genetic Goals Golgi Apparatus Head Homologous Gene Human In Vitro Injury Knockout Mice Lysosomes Mediating Molecular Mus Outcome Study Pathogenesis Pathology Patients Peptides Phase Phenotype Prevention Production Regulation Reporting Resistance Risk Risk-Taking Rodent Role Series Severity of illness Site Small Interfering RNA Sorting - Cell Movement Transgenic Mice Transgenic Organisms Traumatic Brain Injury Wild Type Mouse Work beta-site APP cleaving enzyme 1 caspase-3 in vivo mouse model new therapeutic target overexpression prevent public health relevance trafficking

项目摘要

DESCRIPTION (provided by applicant): Alzheimer's disease (AD) is a complex disease influenced by the actions of multiple genes, their interactions with each other and with the environment. Traumatic brain injury (TBI) is one of the most robust environmental risk factors for AD. TBI has been suggested to accelerate the onset of AD and the severity of the injury positively correlates with increased risk. Compelling evidence is mounting that a single TBI event is associated with increased levels of Aβ and amyloid deposition both in humans and animal models. We, and others, have demonstrated that BACE1 levels are increased following experimental TBI suggesting that BACE1 elevation may be responsible for increased Aβ production following head trauma. However the molecular mechanisms responsible for this post-injury elevation of BACE1 remain largely unknown. We have previously shown that BACE1 increases following cerebral ischemia in rodents and proposed that caspase-mediated depletion of the BACE1 interacting molecule GGA3 (Golgi-localized γ-ear-containing ARF binding protein 3) is the underlying mechanism of BACE1 elevation. We have determined that GGA3 is a caspase-3 substrate and that GGA3 depletion stabilizes BACE1 by impairing its sorting to lysosomes where it is normally degraded. We also reported that levels of GGA3 are decreased and inversely correlated with BACE1 levels in post-mortem AD brains. More recently, we reported that GGA3 and its homologue GGA1 are depleted while BACE1 levels increase in the acute phase post-injury in a mouse model of TBI and in post-mortem AD brains. We further demonstrated the role of GGA3 in the regulation of BACE1 in vivo by showing that BACE1 levels are increased in the brain of GGA3 null mice. Moreover, extensive behavioral analysis of GGA3 null mice has revealed that genetic deletion of GGA3 produces a behavioral phenotype suggesting a specific role for GGA3 in the brain. We have also determined that ectopic expression of GGA3 decreases levels of BACE1 and Aβ in vitro. Thus, we propose: 1) to determine the extent to which the behavioral phenotype of GGA3 null mice depends on BACE1 elevation in specific region of the brains; 2) to determine the extent to which the over-expression of GGA3 reduces levels of BACE1 and Aβ in a caspase-dependent fashion in vivo; 3) to determine the extent to which depletion of GGA1 and GGA3 increases levels of BACE1 and Aβ in a mouse model of TBI.