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Alzheimer Disease ll: Pathophysiology01:23

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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...
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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...
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Abnormal gephyrin immunoreactivity associated with Alzheimer disease pathologic changes.

Chadwick M Hales1, Howard Rees, Nicholas T Seyfried

  • 1From the Department of Neurology (CMH, HR, AIL, JJL, TSW), Center for Neurodegenerative Disease (CMH, HR, NTS, EBD, DMD, MG, AIL, JJL, TSW), Departments of Biochemistry (NTS) and Human Genetics (EBD, TSW), and Pathology and Laboratory Medicine (MG), Emory University School of Medicine, Atlanta, Georgia; Department of Pathology, University of Washington, Seattle, Washington (TJM); Departments of Pathology and Neurology, Johns Hopkins School of Medicine, Baltimore, Maryland (JCT); National Institute of Aging, National Institutes of Health, Bethesda, Maryland (MT); and Atlanta Veterans Administration Medical Center, Atlanta, Georgia (TSW).

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Abnormal accumulations of gephyrin, a protein involved in synaptic function, are specifically linked to Alzheimer disease (AD) pathology. This finding suggests gephyrin may play a role in AD development.

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Area of Science:

  • Neuroscience
  • Neuropathology
  • Molecular Biology

Background:

  • Neurodegenerative disorders often involve abnormal protein accumulation.
  • Alzheimer disease (AD) is characterized by neurofibrillary tangles and beta-amyloid plaques.
  • Gephyrin is an inhibitory receptor-anchoring protein crucial for synaptic organization.

Purpose of the Study:

  • To investigate the potential role of gephyrin accumulation in Alzheimer disease (AD) neuropathology.
  • To determine if gephyrin accumulation is specific to AD compared to other neurodegenerative diseases.

Main Methods:

  • Comparative neuropathologic analysis of brain samples from AD patients and controls.
  • Biochemical and proteomic studies to assess gephyrin solubility and species in brain tissue.

Main Results:

  • Abnormal gephyrin accumulations were highly correlated with the neuropathologic diagnosis of AD.
  • Gephyrin accumulation was specific to AD, absent in normal controls and other neurodegenerative diseases (Parkinson, corticobasal, frontotemporal).
  • Gephyrin deposits in AD overlapped with beta-amyloid plaques and neurofibrillary tangles, showing altered solubility and increased lower-molecular-weight species in the insoluble fraction.

Conclusions:

  • Gephyrin accumulation is a specific neuropathologic feature of Alzheimer disease.
  • Altered gephyrin solubility and species in AD suggest a role in disease pathogenesis.
  • Gephyrin's involvement in synaptic function points to its potential contribution to early synaptic dysfunction in AD.