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Related Concept Videos

Aging01:26

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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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In the CNS, neurogenesis, the birth of new neurons from stem cells, is limited to the hippocampus in adults. In other regions of the brain and spinal cord, neurogenesis is almost non-existent due to inhibitory influences from neuroglia, especially oligodendrocytes, and the absence of growth-stimulating cues. The myelin produced by oligodendrocytes in the CNS inhibits neuronal regeneration. Furthermore, astrocytes proliferate rapidly after neuronal damage, forming scar tissue that physically...
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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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Neuronal Senescence in the Aged Brain.

Shu-Min Chou1, Yu-Hsin Yen1, Fang Yuan1

  • 1Program in Neuroscience & Behavioral Disorders, Duke-NUS Medical School, 169857 Singapore, Singapore.

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|May 17, 2023
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Summary
This summary is machine-generated.

This review defines neuronal senescence, distinguishing age-related neuron changes from common cellular senescence. It proposes cellular homeostasis decline drives neuronal aging and links it to neurodegeneration.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Aging Research

Background:

  • Cellular senescence is a complex state with defined features in dividing cells.
  • Neurons, as long-lived post-mitotic cells, undergo age-related changes, but their senescence is not well-defined.
  • Existing knowledge lacks specific criteria to identify neuronal senescence.

Purpose of the Study:

  • To identify and classify age-related changes specific to neurons in the aging brain.
  • To define these changes as features of neuronal senescence by comparing them to common senescent phenotypes.
  • To explore the role of cellular homeostasis systems in driving neuronal senescence.

Main Methods:

  • Comparative analysis of neuronal aging markers against established cellular senescence features.
  • Literature review focusing on morphological, functional, and molecular changes in aging neurons.
  • Association of neuronal changes with functional decline in proteostasis, redox balance, and calcium dynamics.

Main Results:

  • Proposed identification of specific neuronal senescence phenotypes.
  • Linked neuronal senescence to the decline of cellular homeostasis systems.
  • Highlighted the potential role of these systems as primary drivers of neuronal senescence.

Conclusions:

  • Neuronal senescence is a distinct aging process in the brain.
  • Dysregulation of cellular homeostasis systems may underlie neuronal senescence.
  • Understanding neuronal senescence is crucial for neurodegeneration research and therapeutic development.