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Related Concept Videos

Alzheimer Disease ll: Pathophysiology01:23

Alzheimer Disease ll: Pathophysiology

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 microglia. Abnormal...
Dementia l: Introduction01:22

Dementia l: Introduction

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...
Alzheimer's Disease: Overview01:26

Alzheimer's Disease: Overview

Alzheimer's Disease (AD) is a continually advancing neurodegenerative disorder, distinguished by escalating memory loss, cognitive dysfunction, and dementia. The disease unfolds in three stages: preclinical, mild cognitive impairment (MCI), and dementia. Its onset is insidious, and the progression gradual, with the cause not well explained by other disorders.
The clinical diagnosis of AD hinges on the presence of memory and other cognitive impairments. Biomarkers, such as changes in Aβ and tau...
Alzheimer's Disease: Treatment01:22

Alzheimer's Disease: Treatment

Alzheimer's Disease (AD), a neurodegenerative disorder, is pathologically identified by amyloid plaques and neurofibrillary tangles composed of tau protein. AD pharmacotherapy aims to manage cognitive symptoms, delay disease progression, and treat behavioral symptoms. The treatment is primarily symptomatic and palliative, with no definitive disease-modifying therapy available. Cholinesterase inhibitors, including donepezil (Aricept), rivastigmine (Exelon), and galantamine (Razadyne), are...
Alzheimer Disease l: Introduction01:29

Alzheimer Disease l: Introduction

Alzheimer disease is a chronic, progressive, and irreversible neurodegenerative disorder and the most common cause of dementia in older adults. It leads to gradual neuronal loss, causing cognitive decline, behavioral changes, and loss of functional independence.Risk Factors and EtiologyThe disease is multifactorial. Age is the strongest risk factor, with prevalence doubling every 5 years after age 65. Genetic factors include mutations in genes such as APP, PSEN1, and PSEN2, which are associated...
Amyloid Fibrils03:03

Amyloid Fibrils

Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
Amyloid deposits were observed as early as 1639 in the liver and the spleen.   In 1854, Rudolph Virchow performed iodine staining, normally used to...

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Related Experiment Video

Updated: Jun 18, 2026

Preparation of Oligomeric &beta;-amyloid1-42 and Induction of Synaptic Plasticity Impairment on Hippocampal Slices
04:41

Preparation of Oligomeric β-amyloid1-42 and Induction of Synaptic Plasticity Impairment on Hippocampal Slices

Published on: July 14, 2010

Alzheimer's disease: synaptic dysfunction and Abeta.

Ganesh M Shankar1, Dominic M Walsh

  • 1Center for Neurologic Diseases, Harvard Medical School and Brigham and Women's Hospital, Boston, MA, USA. gshankar1@partners.org.

Molecular Neurodegeneration
|November 26, 2009
PubMed
Summary
This summary is machine-generated.

Alzheimer's disease (AD) involves early synapse loss, leading to memory impairment. Soluble amyloid beta-protein (Abeta) forms are key culprits in this synaptic damage and potential therapeutic targets.

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Neurodegeneration in an Animal Model of Chronic Amyloid-beta Oligomer Infusion Is Counteracted by Antibody Treatment Infused with Osmotic Pumps
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Neurodegeneration in an Animal Model of Chronic Amyloid-beta Oligomer Infusion Is Counteracted by Antibody Treatment Infused with Osmotic Pumps

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Evaluation of Synapse Density in Hippocampal Rodent Brain Slices
07:44

Evaluation of Synapse Density in Hippocampal Rodent Brain Slices

Published on: October 6, 2017

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Last Updated: Jun 18, 2026

Preparation of Oligomeric &beta;-amyloid1-42 and Induction of Synaptic Plasticity Impairment on Hippocampal Slices
04:41

Preparation of Oligomeric β-amyloid1-42 and Induction of Synaptic Plasticity Impairment on Hippocampal Slices

Published on: July 14, 2010

Neurodegeneration in an Animal Model of Chronic Amyloid-beta Oligomer Infusion Is Counteracted by Antibody Treatment Infused with Osmotic Pumps
10:19

Neurodegeneration in an Animal Model of Chronic Amyloid-beta Oligomer Infusion Is Counteracted by Antibody Treatment Infused with Osmotic Pumps

Published on: August 14, 2016

Evaluation of Synapse Density in Hippocampal Rodent Brain Slices
07:44

Evaluation of Synapse Density in Hippocampal Rodent Brain Slices

Published on: October 6, 2017

Area of Science:

  • Neuroscience
  • Neuropathology
  • Molecular Biology

Background:

  • Synapse loss is an early hallmark of Alzheimer's disease (AD), correlating with dementia severity.
  • Disrupted neural plasticity contributes to memory deficits and eventual cell loss in AD.

Purpose of the Study:

  • To review evidence implicating soluble amyloid beta-protein (Abeta) in synaptic compromise in AD.
  • To discuss mechanisms of Abeta-induced synaptotoxicity.
  • To identify potential therapeutic targets for AD.

Main Methods:

  • Review of multi-disciplinary research on Alzheimer's disease.
  • Analysis of studies on amyloid beta-protein (Abeta) and its role in synaptic function.
  • Examination of mechanisms underlying Abeta synaptotoxicity.

Main Results:

  • Non-fibrillar soluble forms of Abeta are identified as mediators of synaptic compromise in AD.
  • Evidence suggests Abeta directly impacts synaptic integrity and function.
  • Potential pathways for Abeta-induced neuronal damage are highlighted.

Conclusions:

  • Soluble Abeta species are critical in mediating synapse loss and dysfunction in Alzheimer's disease.
  • Understanding Abeta synaptotoxicity mechanisms is crucial for developing effective AD therapies.
  • Targeting Abeta-mediated synaptic damage offers a promising therapeutic strategy for AD.