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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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Neurodegenerative disorders are progressive diseases that cause irreversible damage and loss to neurons in specific brain areas. Examples of these disorders include Parkinson's disease, Alzheimer's disease, Multiple Sclerosis (MS), and Amyotrophic Lateral Sclerosis (ALS). These disorders share characteristics such as proteinopathies, selective neuronal vulnerability, and a complex interplay between genetic and environmental factors. The primary therapeutic goal for these conditions is to...
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Symmetric Bihemispheric Postmortem Brain Cutting to Study Healthy and Pathological Brain Conditions in Humans
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Pathologic lesions in neurodegenerative diseases.

Paul M Thompson1, Harry V Vinters

  • 1Laboratory of Neuro Imaging, David Geffen School of Medicine at UCLA & UCLA Medical Center, Los Angeles, California, USA.

Progress in Molecular Biology and Translational Science
|April 10, 2012
PubMed
Summary

Neuroimaging and neuropathology are key methods for studying brain structure and Alzheimer disease progression. These techniques, including MRI and PET scans, help quantify brain atrophy and protein deposition.

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Area of Science:

  • Neurology
  • Neuroscience
  • Medical Imaging

Background:

  • Neuropathologic studies have long informed our understanding of dementia.
  • Advancements in neuroimaging, particularly MRI, emerged in the late 1970s.
  • Alzheimer disease is characterized by progressive brain atrophy.

Purpose of the Study:

  • To discuss neuroimaging and neuropathology as methods for assessing brain structure.
  • To highlight the role of these techniques in understanding Alzheimer disease.

Main Methods:

  • Quantitative magnetic resonance imaging (MRI) to measure brain atrophy.
  • Positron emission tomography (PET) with amyloid ligands to study protein deposition.
  • Neuropathologic analysis using antibodies to detect synapse loss and protein aggregates (ABeta, phosphor-tau).

Main Results:

  • MRI can quantify progressive hippocampal and neocortical atrophy in Alzheimer disease.
  • PET imaging can localize amyloid proteins in the brain.
  • Neuropathology reveals synapse loss and specific protein depositions crucial to Alzheimer disease progression.

Conclusions:

  • Neuroimaging and neuropathology are complementary approaches for studying brain structure.
  • These methods provide valuable insights into Alzheimer disease pathology and progression.
  • Correlating neuroimaging findings with neuropathologic assessment enhances understanding.