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Related Concept Videos

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...
Cellular Injury V: Apoptosis and Autophagy01:22

Cellular Injury V: Apoptosis and Autophagy

Cells respond to damage and stress through highly coordinated processes that decide whether they survive or undergo controlled self-destruction. Two major pathways involved in this regulation are apoptosis, a type of programmed cell death, and autophagy, a survival mechanism that helps cells adapt to adverse conditions.ApoptosisApoptosis removes aged or injured cells to maintain tissue balance. During this process, the cell shrinks, chromatin condenses and fragments, and membrane-bound...
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.
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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...
Telomeres and Telomerase02:41

Telomeres and Telomerase

In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded DNA.

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Updated: Jun 21, 2026

Techniques to Induce and Quantify Cellular Senescence
06:51

Techniques to Induce and Quantify Cellular Senescence

Published on: May 1, 2017

Cellular senescence: unravelling complexity.

João F Passos1, Cedric Simillion, Jennifer Hallinan

  • 1Ageing Biology Laboratories and Centre for Integrated Systems Biology of Ageing and Nutrition (CISBAN), Institute for Ageing and Health, Newcastle University, Newcastle upon Tyne, UK. Joao.Passos@ncl.ac.uk

Age (Dordrecht, Netherlands)
|July 21, 2009
PubMed
Summary
This summary is machine-generated.

Cellular senescence, a process linked to aging and cancer suppression, involves complex cellular pathways beyond just telomere shortening. Understanding these intricate mechanisms is key to its role in health and disease.

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Last Updated: Jun 21, 2026

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

SA-β-Galactosidase-Based Screening Assay for the Identification of Senotherapeutic Drugs
07:39

SA-β-Galactosidase-Based Screening Assay for the Identification of Senotherapeutic Drugs

Published on: June 28, 2019

Area of Science:

  • Cellular and Molecular Biology
  • Gerontology
  • Oncology

Background:

  • Cellular senescence is traditionally linked to telomere shortening.
  • It plays a dual role in tumor suppression and age-related tissue dysfunction.
  • Recent research indicates senescence is a complex, multi-process phenomenon.

Purpose of the Study:

  • To review the intricate cellular processes involved in senescence.
  • To highlight the roles of mitochondrial function, reactive oxygen species, and chromatin remodeling.
  • To explore the application of systems biology in understanding senescence.

Main Methods:

  • Literature review of cellular senescence mechanisms.
  • Analysis of mitochondrial function and reactive oxygen species (ROS) in senescence.
  • Examination of senescence-associated secreted proteins (SASP) and chromatin remodeling.
  • Discussion of systems biology approaches.

Main Results:

  • Senescence involves more than telomere loss, encompassing multiple sequential cellular processes.
  • Mitochondrial dysfunction and ROS contribute significantly to the senescent phenotype.
  • Senescence-associated secreted proteins and chromatin changes are crucial for its establishment and maintenance.
  • Systems biology offers a framework to dissect senescence complexity.

Conclusions:

  • Cellular senescence is a complex biological process with implications for aging and cancer.
  • Understanding the interplay of mitochondrial function, ROS, SASP, and chromatin remodeling is vital.
  • Systems biology is a powerful tool for unraveling the multifaceted nature of senescence.