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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...
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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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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. 
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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.
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Related Experiment Video

Updated: Jul 10, 2026

In Vitro Aggregation Assays Using Hyperphosphorylated Tau Protein
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Published on: January 2, 2015

Modular brain networks shape amyloid-driven tau spread and cognitive decline.

Fabian Hirsch1, Lukas Frontzkowski1,2, Anna Steward1

  • 1Institute for Stroke and Dementia Research (ISD), University Hospital, LMU Munich, Munich, Germany.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
|July 8, 2026
PubMed
Summary

Brain network connectivity influences Alzheimer's disease (AD) progression. Higher epicenter broadcast capacity (EBC) in tau pathology epicenters accelerates tau spread and cognitive decline, while within-network communication contains it.

Keywords:
graph theoryintegrationneurodegenerationneuroimagingsegregationtauopathy

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Area of Science:

  • Neuroscience
  • Neurodegenerative Diseases
  • Brain Network Analysis

Background:

  • Alzheimer's disease (AD) is characterized by tau pathology spread from temporal lobe origins, influenced by amyloid beta (Aβ).
  • The role of brain network architecture in modulating tau propagation and cognitive decline in AD is not fully understood.
  • Investigating how tau epicenters connect to different network communication pathways is crucial for understanding disease heterogeneity.

Purpose of the Study:

  • To determine if the connectivity of tau epicenters influences the spread of tau pathology driven by amyloid beta.
  • To examine the relationship between epicenter broadcast capacity (EBC) and the rate of tau accumulation, spread, and cognitive decline in AD.
  • To elucidate the mechanism by which brain network architecture shapes Aβ-driven tau propagation.

Main Methods:

  • Combined longitudinal amyloid and tau positron emission tomography (PET) data from two independent AD cohorts (N=490).
  • Integrated PET data with multimodal connectomics to analyze brain network architecture.
  • Quantified epicenter broadcast capacity (EBC) to assess tau epicenter access to cross-network versus within-network communication pathways.

Main Results:

  • Higher EBC correlated with accelerated global tau accumulation and greater spatial tau spread in Aβ-positive individuals.
  • Steeper cognitive decline was associated with higher EBC, indicating faster disease progression.
  • Preferential communication with cross-network hubs amplified tau spread, whereas within-network communication was linked to more contained tau pathology.

Conclusions:

  • Epicenter connectivity significantly biases Aβ-driven tau propagation, determining whether it spreads widely or remains regionally contained.
  • This mechanism helps explain the observed heterogeneity in Alzheimer's disease progression.
  • Understanding epicenter broadcast capacity offers insights into modulating tau spread and cognitive decline in AD.