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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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Related Experiment Video

Updated: May 10, 2026

Evaluation of Synapse Density in Hippocampal Rodent Brain Slices
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Published on: October 6, 2017

A novel synaptic compartmentalization failure framework for neurodegeneration.

Baikuntha Panigrahi1

  • 1Department of Neurology, All India Institute of Medical Sciences, Deoghar, Jharkhand, India.

Journal of Alzheimer'S Disease : JAD
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Summary

Neurodegenerative diseases may arise from a decline in the brain

Keywords:
Alzheimer's diseaseParkinson's diseaseneurodegenerationsynaptic plasticity

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Area of Science:

  • Neuroscience
  • Cellular Biology
  • Neurodegenerative Diseases

Background:

  • Synaptic plasticity depends on localized signaling within neuronal compartments like dendritic spines.
  • Activity-dependent remodeling maintains these compartments, ensuring proper signal termination.
  • Ageing and glial dysfunction can disrupt synaptic structure and function.

Purpose of the Study:

  • To propose a unifying framework linking neurodegeneration to a decline in synaptic compartmentalization.
  • To identify ageing and glial dysregulation as key drivers of this decline.
  • To explain early synaptic dysfunction and disease propagation through this lens.

Main Methods:

  • Conceptual framework development.
  • Review of existing literature on synaptic plasticity, ageing, glial function, and neurodegenerative disease.
  • Analysis of protein dynamics (tau, alpha synuclein) in relation to cytoskeletal organization.

Main Results:

  • A decline in synaptic compartmentalization capacity leads to diffuse and prolonged signaling.
  • This prolonged signaling causes chronic structural and energetic stress on neurons.
  • Destabilization of proteins like tau and alpha synuclein can result in pathological aggregation.

Conclusions:

  • Neurodegeneration can be viewed as a failure of synaptic compartmentalization.
  • Protein aggregation is a downstream consequence of this primary vulnerability.
  • This framework explains disease progression, neuronal vulnerability, and limitations of current therapies.