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Related Concept Videos

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
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
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Replicative Cell Senescence02:15

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Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds...
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Mitochondria01:37

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Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
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The Effect of Aging on Tissues01:19

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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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Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
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Redox Reactions01:27

Redox Reactions

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Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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Measurement of Protein Turnover Rates in Senescent and Non-Dividing Cultured Cells with Metabolic Labeling and Mass Spectrometry
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Cellular Senescence, Neurological Function, and Redox State.

Luis Ángel Maciel-Barón1, Daniel Moreno-Blas2, Sandra Lizbeth Morales-Rosales1

  • 11 División de Ciencias Biológicas y de la Salud, Department Ciencias de la Salud, Universidad Autónoma Metropolitana Iztapalapa , Iztapalapa, México .

Antioxidants & Redox Signaling
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Summary
This summary is machine-generated.

Cellular senescence, a state of permanent cell cycle arrest, is now observed in brain cells, including neurons. Understanding its triggers and links to neurodegenerative diseases is crucial for developing new therapies.

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Induction and Validation of Cellular Senescence in Primary Human Cells
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Area of Science:

  • Neuroscience
  • Cell Biology
  • Aging Research

Background:

  • Cellular senescence, permanent cell cycle arrest, is well-studied in fibroblasts but less understood in the brain.
  • Metabolic and redox homeostasis are altered in aging and neurodegenerative diseases (NDDs).
  • The specific triggers and consequences of brain cellular senescence remain largely unknown.

Purpose of the Study:

  • To review the evidence for cellular senescence in different brain cell types.
  • To explore the potential link between blood-brain barrier compromise, oxidative stress, and senescence induction.
  • To propose that neurons can undergo senescence, challenging previous assumptions.

Main Methods:

  • Literature review and synthesis of existing studies on brain cellular senescence.
  • Integration of findings on metabolic alterations, oxidative stress, and neuroinflammation.
  • Analysis of observations of senescence hallmarks in neurons.

Main Results:

  • Cellular senescence occurs in various brain cell types, including glial cells and, controversially, neurons.
  • Compromised blood-brain barrier and subsequent immune cell infiltration can lead to oxidative damage and senescence.
  • Senescence in brain cells is linked to aging and neurodegenerative conditions.

Conclusions:

  • Cellular senescence is a relevant phenomenon in the aged brain and NDDs.
  • Further research is needed to elucidate the precise mechanisms and signaling pathways involved.
  • Understanding brain senescence offers potential therapeutic targets for age-related neurological disorders.