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Related Concept Videos

Aging01:26

Aging

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...
Radical Autoxidation01:20

Radical Autoxidation

The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
Replicative Cell Senescence02:15

Replicative Cell Senescence

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 the telomeric...
Replicative Cell Senescence02:15

Replicative Cell Senescence

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 the telomeric...
Bioactivation and Tissue Toxicity01:25

Bioactivation and Tissue Toxicity

Bioactivation is a metabolic process that transforms less reactive substances into highly reactive metabolites, initiating tissue toxicity. This transformation can lead to various toxic effects, including carcinogenesis and teratogenesis. Reactive metabolites are classified into two main types: electrophiles and free radicals.Electrophiles are electron-deficient species and are produced primarily by the enzyme cytochrome P-450 during the metabolism of compounds containing carbon, nitrogen, or...
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Overview of DNA Repair

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Related Experiment Video

Updated: Jul 7, 2026

A Quantitative Measurement of Reactive Oxygen Species and Senescence-associated Secretory Phenotype in Normal Human Fibroblasts During Oncogene-induced Senescence
13:59

A Quantitative Measurement of Reactive Oxygen Species and Senescence-associated Secretory Phenotype in Normal Human Fibroblasts During Oncogene-induced Senescence

Published on: August 12, 2018

Free radicals and senescence.

Teng Lu1, Toren Finkel

  • 1Translational Medicine Branch, NHLBI, NIH, Building 10/CRC 5-3330, Bethesda, MD 20892, USA.

Experimental Cell Research
|February 20, 2008
PubMed
Summary

A rise in intracellular reactive oxygen species (ROS) is linked to cellular senescence. This review examines how modulating ROS levels and antioxidant status influences senescence, suggesting ROS may trigger this process in vivo.

Area of Science:

  • Cell Biology
  • Oxidative Stress Research
  • Aging Studies

Background:

  • Cellular senescence is a key process in aging and disease.
  • Reactive oxygen species (ROS) are implicated in various cellular functions and pathologies.
  • Existing evidence suggests a correlation between elevated intracellular ROS and the onset of senescence.

Purpose of the Study:

  • To review experimental evidence linking intracellular ROS levels to cellular senescence.
  • To explore the role of ROS modulation through oxygen concentrations and antioxidant status.
  • To discuss the potential involvement of ROS in oncogene-induced and in vivo senescence.

Main Methods:

  • Review of experimental studies modulating intracellular ROS levels.
  • Analysis of cellular responses to varying oxygen concentrations (high/low).

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Techniques to Induce and Quantify Cellular Senescence
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Techniques to Induce and Quantify Cellular Senescence

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Induction and Validation of Cellular Senescence in Primary Human Cells
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Induction and Validation of Cellular Senescence in Primary Human Cells

Published on: June 20, 2018

Related Experiment Videos

Last Updated: Jul 7, 2026

A Quantitative Measurement of Reactive Oxygen Species and Senescence-associated Secretory Phenotype in Normal Human Fibroblasts During Oncogene-induced Senescence
13:59

A Quantitative Measurement of Reactive Oxygen Species and Senescence-associated Secretory Phenotype in Normal Human Fibroblasts During Oncogene-induced Senescence

Published on: August 12, 2018

Techniques to Induce and Quantify Cellular Senescence
06:51

Techniques to Induce and Quantify Cellular Senescence

Published on: May 1, 2017

Induction and Validation of Cellular Senescence in Primary Human Cells
08:18

Induction and Validation of Cellular Senescence in Primary Human Cells

Published on: June 20, 2018

  • Examination of studies perturbing cellular antioxidant status.
  • Main Results:

    • Experimental evidence supports a role for increased intracellular ROS in triggering senescence.
    • Senescence induced by oncogene expression is partially mediated by ROS.
    • Emerging evidence suggests ROS may also trigger senescence in vivo.

    Conclusions:

    • Increased intracellular ROS is a significant factor contributing to cellular senescence.
    • Further research is needed to elucidate the precise mechanisms and specific ROS species involved in senescence induction.