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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...
The Effect of Aging on Tissues01:19

The Effect of Aging on Tissues

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...
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...
Overview of DNA Repair02:25

Overview of DNA Repair

In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a million damaging events by natural causes and external factors. Ionizing radiation such as UV rays, free radicals produced during cellular respiration, and hydrolytic damage from metabolic reactions can alter the structure of DNA. Damages caused include single-base alteration, base dimerization, chain breaks, and cross-linkage.
Chemically...
Nucleotide Excision Repair01:38

Nucleotide Excision Repair

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Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...

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Related Experiment Video

Updated: Jul 9, 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

Nonpathological senescence arises from unsuitable external influences.

Alexander V Khalyavkin1, Anatoli I Yashin

  • 1Institute of Biochemical Physics of RAS, 4 Kosygin St, Moscow 119334, Russia. ab3711@mail.sitek.net

Annals of the New York Academy of Sciences
|December 7, 2007
PubMed
Summary

Environmental factors significantly influence aging. Modulating external stimuli can decelerate, halt, or even reverse aging, potentially extending lifespan by optimizing organismal renewal processes.

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

Published on: May 1, 2017

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Last Updated: Jul 9, 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

Area of Science:

  • Biogerontology
  • Environmental Science
  • Cellular Biology

Background:

  • Aging is influenced by environmental factors.
  • External stimuli can ameliorate and rejuvenate biological entities.
  • Nonpathological cellular aging may be reversible and caused by external signals.

Purpose of the Study:

  • To investigate environmental control over the rate of aging in whole organisms.
  • To explore the concept of an 'ageless' state under specific natural conditions.
  • To understand how environmental conditions affect aging and lifespan.

Main Methods:

  • Theoretical extension of cellular aging principles to whole organisms.
  • Analysis of the trade-offs between environmental mortality and aging in different conditions.
  • Hypothesizing the impact of mild versus stimulating environments on renewal processes.

Main Results:

  • A specific range of natural conditions may allow organisms to remain 'ageless'.
  • Milder environments can lead to incomplete renewal and aging.
  • Reduced environmental mortality can initially compensate for age-dependent mortality, increasing life expectancy.

Conclusions:

  • Environmental conditions play a crucial role in regulating aging.
  • Manipulating environmental stimuli can decelerate, stop, or reverse aging.
  • Optimizing environmental factors can significantly extend mean and extreme lifespan.