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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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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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Alzheimer Disease l: Introduction01:29

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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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Aging01:26

Aging

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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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Drugs affecting neurotransmitter synthesis can impact the adrenergic neuron and the synthesis of neurotransmitters. For example, α-methyltyrosine and carbidopa target specific enzymes involved in catecholamine synthesis. α-methyltyrosine inhibits the enzyme tyrosine hydroxylase, which converts tyrosine into dopamine. By blocking this enzyme, α-methyltyrosine reduces dopamine production and other catecholamines. Carbidopa, on the other hand, inhibits the enzyme dopa decarboxylase,...
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Related Experiment Video

Updated: May 1, 2026

An Alternative Approach to Study Primary Events in Neurodegeneration Using Ex Vivo Rat Brain Slices
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Chronochemistry in neurodegeneration.

Annalisa Pastore1, Salvatore Adinolfi1

  • 1Department of Clinical Neuroscience, Institute of Psychiatry, King's College London London, UK.

Frontiers in Molecular Neuroscience
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Summary
This summary is machine-generated.

Distinguishing disease causes from effects is crucial. New tools help track disease development, offering insights into Alzheimer's disease and Friedreich's ataxia etiology.

Keywords:
Alzheimer’s diseaseFriedreich’s ataxiadeterminismdisease development

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biochemistry

Background:

  • Establishing disease etiology requires distinguishing cause from effect.
  • This challenge is exemplified by Alzheimer's disease (AD) and Friedreich's ataxia (FRDA).

Purpose of the Study:

  • To explore how the cause-effect problem impacts our understanding of AD and FRDA.
  • To highlight the evolution of etiological theories for these diseases.

Main Methods:

  • Review of historical and current research on AD and FRDA.
  • Discussion of how scientific focus has shifted regarding disease mechanisms.

Main Results:

  • In AD, the focus shifted from fibrillar aggregates to soluble aggregates as disease causes.
  • In FRDA, etiological theories evolved from oxidative stress to iron-sulfur cluster dysfunction.

Conclusions:

  • Understanding the progression from cause to effect is vital for disease research.
  • New tools are enabling better tracking of disease development and mechanisms.