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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...
Replication in Eukaryotes01:29

Replication in Eukaryotes

In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
Replication in Eukaryotes02:31

Replication in Eukaryotes

Overview
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.
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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Related Experiment Video

Updated: May 17, 2026

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

T cell replicative senescence in human aging.

Jennifer P Chou1, Rita B Effros

  • 1Dept of Pathology &Laboratory Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095-1732, USA.

Current Pharmaceutical Design
|October 16, 2012
PubMed
Summary
This summary is machine-generated.

Aging immune systems decline due to T cell replicative senescence, increasing disease risk. This review explores how senescent T cells contribute to age-related diseases and potential therapies.

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Techniques to Induce and Quantify Cellular Senescence
06:51

Techniques to Induce and Quantify Cellular Senescence

Published on: May 1, 2017

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Last Updated: May 17, 2026

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

Techniques to Induce and Quantify Cellular Senescence
06:51

Techniques to Induce and Quantify Cellular Senescence

Published on: May 1, 2017

Area of Science:

  • Immunology
  • Gerontology
  • Cellular Biology

Background:

  • Immune system decline with age increases susceptibility to infections and diseases.
  • T cell replicative senescence, a terminal state of T cells, is linked to aging and immune dysfunction.
  • Accumulation of senescent CD8 T cells, often CMV-specific, is observed in the elderly.

Purpose of the Study:

  • To review evidence on CD8 T cell replicative senescence's role in age-related diseases.
  • To discuss potential therapeutic strategies to counteract T cell senescence.
  • To highlight the impact of immune system aging on individuals and healthcare.

Main Methods:

  • Review of in vivo and in vitro studies on T cell senescence.
  • Analysis of the link between cytomegalovirus (CMV) infection and immune senescence.
  • Examination of senescent T cells in various pathologies including cancer and chronic infections.

Main Results:

  • Senescent T cells exhibit dysregulated immune function, loss of CD28, shortened telomeres, and increased proinflammatory cytokines.
  • CMV infection may drive T cell senescence and alter the T cell repertoire.
  • Senescent T cells are implicated in age-related diseases, cancers, autoimmune disorders, and chronic infections like HIV.

Conclusions:

  • CD8 T cell replicative senescence contributes significantly to age-related pathologies.
  • Therapeutic interventions targeting T cell senescence may delay or prevent age-related immune decline.
  • The aging immune system, characterized by senescent T cells, poses challenges for healthcare systems globally.