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Related Concept Videos

Alzheimer Disease ll: Pathophysiology01:23

Alzheimer Disease ll: Pathophysiology

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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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Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
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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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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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Parkinson Disease ll: Pathophysiology01:24

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Parkinson disease (PD) is a progressive neurodegenerative disorder primarily affecting movement, with additional non-motor features. Its pathophysiology involves complex interactions among genetic susceptibility, environmental exposures, and cellular dysfunction, including dopaminergic neuron loss, protein aggregation, and mitochondrial impairment.Selective NeurodegenerationA key feature is the degeneration of dopaminergic neurons in the substantia nigra pars compacta, leading to reduced...
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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: May 1, 2026

Evaluation of Synapse Density in Hippocampal Rodent Brain Slices
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Linking pathways in the developing and aging brain with neurodegeneration.

G G Kovacs1, H Adle-Biassette2, I Milenkovic1

  • 1Institute of Neurology, Medical University of Vienna, Austria.

Neuroscience
|April 5, 2014
PubMed
Summary

Brain development is crucial for preventing neurodegenerative diseases (NDDs). Early life interventions promoting healthy development may prevent age-related NDDs like Alzheimer's disease.

Keywords:
braindevelopmentdevelopmental pathwayshumanneurodegenerationneurodegenerative disease-associated proteins

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Gerontology

Background:

  • Brain development involves intricate molecular and cellular mechanisms for proper network formation.
  • Developmental alterations from genetic or environmental factors can cause aberrant networks linked to learning disabilities.
  • Late-onset neurological disorders, including Alzheimer's disease, may stem from aberrant neural development initiated early in life.

Purpose of the Study:

  • To review neurogenesis in aging, neurodegenerative disease (NDD)-associated proteins/pathways in the developing brain, and common pathways in developing/neurodegenerating brains.
  • To understand early developmental pathogenetic routes contributing to pathological aging.
  • To identify therapeutic intervention strategies for NDDs by targeting early developmental processes.

Main Methods:

  • Literature review focusing on neurogenesis, NDDs, and brain development and aging.
  • Analysis of shared pathways between developmental and neurodegenerative processes.
  • Synthesis of experimental and clinical evidence on developmental alterations and their link to neurological disorders.

Main Results:

  • Shared pathways exist between developing and neurodegenerating brains.
  • Proteins and pathways critical for brain development are also implicated in age-related neurodegeneration.
  • Early-life developmental stages are critical for establishing long-term brain health and preventing late-onset disorders.

Conclusions:

  • Preventing NDDs in the elderly may involve interventions during fetal and childhood development.
  • A healthy environment for mothers and children is essential for fetal and childhood brain development.
  • Understanding early developmental mechanisms is key to preventing pathological aging and NDDs.