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相关概念视频

Ischemic Stroke ll: Pathophysiology01:15

Ischemic Stroke ll: Pathophysiology

54
An ischemic stroke occurs when a cerebral blood vessel becomes obstructed, most often by a thrombus or embolus, interrupting the delivery of oxygen and glucose to brain tissue. Because neurons rely on continuous aerobic metabolism, energy failure begins within minutes of reduced perfusion. The region receiving the least blood flow becomes the infarct core, an area of irreversible cellular death. Surrounding this core lies the penumbra, a zone of hypoperfused but still viable tissue that is...
54
Transient Ischemic Attack l: Introduction01:26

Transient Ischemic Attack l: Introduction

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A transient ischemic attack (TIA) is a brief episode of neurological dysfunction caused by a temporary, focal reduction in cerebral blood flow. Although symptoms resemble those of an ischemic stroke, the interruption in perfusion is short-lived and does not cause permanent infarction. TIAs are clinically important because they often serve as early warning events for future stroke.Mechanisms of Transient Cerebral IschemiaTransient cerebral ischemia may arise through several mechanisms. One...
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Cerebral Edema ll: Pathophysiology01:22

Cerebral Edema ll: Pathophysiology

19
Vasogenic edema is a major form of cerebral edema characterized by abnormal accumulation of fluid in the brain’s extracellular space due to disruption of the blood–brain barrier (BBB). The BBB is a specialized structure composed of endothelial cells connected by tight junctions, supported by astrocytic endfeet and a basement membrane. Under normal conditions, it tightly regulates the movement of ions, proteins, and solutes between the bloodstream and brain parenchyma. When this...
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Alzheimer Disease ll: Pathophysiology01:23

Alzheimer Disease ll: Pathophysiology

35
Alzheimer disease involves structural changes in the brain that begin long before symptoms appear. The most distinctive features are extracellular neuritic plaques and intracellular neurofibrillary tangles.Neuritic plaques form in the cerebral cortex and around blood vessels. These plaques contain a dense core of beta-amyloid (Aβ)—a toxic protein fragment that clumps outside neurons. The core is surrounded by damaged neuronal extensions, as well as reactive astrocytes and...
35
Dementia l: Introduction01:22

Dementia l: Introduction

35
Dementia is an acquired, progressive syndrome characterized by a decline in multiple cognitive domains severe enough to impair daily functioning and reduce independence. Although memory loss is a central feature, the diagnosis requires additional deficits involving language, executive function, visuospatial skills, judgment, calculation, or abstract reasoning. These cognitive impairments reflect underlying neurodegenerative or vascular processes that gradually disrupt neuronal networks...
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In Vitro Aggregation Assays Using Hyperphosphorylated Tau Protein
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大脑的低 perfusion 减少了 tau 的积累.

Ghupurjan Gheni1, Mitsuru Shinohara1,2, Masami Masuda-Suzukake3

  • 1Department of Aging Neurobiology, Center for Development of Advanced Medicine for Dementia, National Center for Geriatrics and Gerontology, 7-430 Morioka, Obu, Aichi, 474-8511, Japan.

Annals of clinical and translational neurology
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概括

脑血管疾病,如中风,可能会减少阿尔茨海默氏症 (AD) tau 病理. 慢性大脑低 perfusion 降低了tau的积累,可能是通过增强的微质活动和cathepsin D,提供了对多病症的见解.

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科学领域:

  • 神经科学是一个神经科学.
  • 神经病理学神经病理学
  • 老年学是一门学科.

背景情况:

  • 阿尔茨海默病 (AD) 经常与脑血管疾病同时发生.
  • 脑血管疾病对阿尔茨海默病理学的具体影响还不清楚.

研究的目的:

  • 研究大脑血管疾病和阿尔茨海默氏症病理学的关系.
  • 阐明大脑低 perfusion 影响陶积累的机制.

主要方法:

  • 来自国家阿尔茨海默氏症协调中心 (NACC) 数据库的临床和神经病理数据的分析.
  • 利用双边常见动脉狭窄和tau种子注射的小鼠模型研究慢性大脑低 perfusion对神经元,星球细胞,微质细胞和寡干细胞的tau病理的影响.

主要成果:

  • 在人类数据中,临床中风史和缺口性心脏病发作与减少的神经纤维状结病理相关.
  • 在动物模型中,大脑的低 perfusion 降低了多种细胞类型的tau病理.
  • 在tau病理和低的条件下观察到活化的星体细胞和微质细胞.
  • lysosomal酶 cathepsin D 的水平随着大脑的低 perfusion 增加.

结论:

  • 大脑的低注似乎通过增加tau的微质细胞化和通过cathepsin D增强降解来减少tau的积累.
  • 这些发现揭示了多种健康状况的老年人中tau病理和脑血管疾病之间的相互作用.