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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.
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Alzheimer's Disease: Overview01:26

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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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Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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Parkinson's Disease: Overview01:15

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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...
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Disorders of the Nervous Tissue01:28

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Nervous tissue is a vital component of the human body's communication system, enabling us to perceive and respond to stimuli. However, like all other tissues, it is vulnerable to disorders and diseases that can significantly impact our neurological functioning.
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Cognitive Development During Adulthood01:30

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Cognitive development continues throughout adulthood, undergoing significant shifts across early, middle, and late stages. Individual transition occurs from adolescent idealism to pragmatic and adaptable thinking in early adulthood. During this period, individuals learn to integrate personal beliefs with the recognition that other perspectives are equally valid. Exposure to the complexities of modern society, diverse experiences, and higher education contribute to this adaptive thought process,...
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Updated: Sep 3, 2025

Symmetric Bihemispheric Postmortem Brain Cutting to Study Healthy and Pathological Brain Conditions in Humans
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[Neurodegenerative diseases and brain aging].

Jean-Pierre Henry

    Biologie Aujourd'Hui
    |July 25, 2022
    PubMed
    Summary

    Brain aging accelerates neurodegenerative diseases like Alzheimer's by causing cellular senescence and impairing waste clearance. This leads to protein aggregation and neuron death, increasing disease risk with age.

    Keywords:
    agingcellules sénescentesglymphatic washinglavage glymphatiquemaladies neurodégénérativesneurodegenerative diseasesproteinopathiesprotéinopathiessenescent cellsvieillissement

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    Area of Science:

    • Neuroscience
    • Gerontology
    • Cell Biology

    Background:

    • Neurodegenerative diseases (Alzheimer's, Parkinson's, ALS) risk increases with age.
    • Brain aging involves cellular senescence and inflammation.
    • Aging impairs glymphatic clearance of brain waste products.

    Purpose of the Study:

    • To elucidate the relationship between brain aging processes and neurodegenerative disease.
    • To understand how aging-induced cellular changes contribute to pathology.

    Main Methods:

    • Review of current literature on brain aging and neurodegeneration.
    • Analysis of cellular senescence markers in aging brains.
    • Investigation of glymphatic function in aged models.

    Main Results:

    • Cellular senescence in brain cells (neurons, glia) is a hallmark of aging.
    • Aging reduces synaptic plasticity and cognitive function.
    • Impaired glymphatic clearance leads to accumulation of misfolded proteins.

    Conclusions:

    • Brain aging creates a vulnerable environment for neurodegeneration.
    • Cellular senescence and impaired waste removal are key contributors.
    • Understanding these aging mechanisms is crucial for therapeutic development.