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Related Concept Videos

Cancer-Critical Genes I: Proto-oncogenes01:33

Cancer-Critical Genes I: Proto-oncogenes

Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
Cancer-Critical Genes I: Proto-oncogenes01:33

Cancer-Critical Genes I: Proto-oncogenes

Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
Interactions Between Signaling Pathways01:19

Interactions Between Signaling Pathways

Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
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...
Cancers Originate from Somatic Mutations in a Single Cell02:21

Cancers Originate from Somatic Mutations in a Single Cell

Cancer arises from mutations in the critical genes that allow healthy cells to escape cell cycle regulation and acquire the ability to proliferate indefinitely. Though originating from a single mutation event in one of the originator cells, cancer progresses when the mutant cell lines continue to gain more and more mutations, and finally, become malignant. For example, chronic myelogenous leukemia (CML) develops initially as a non-lethal increase in white blood cells, which progressively...

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Related Experiment Video

Updated: Jul 8, 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

Many roads lead to oncogene-induced senescence.

S Courtois-Cox1, S L Jones, K Cichowski

  • 1Genetics Division, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 2115, USA.

Oncogene
|January 15, 2008
PubMed
Summary

Oncogene-induced senescence, a tumor suppression mechanism, involves complex signaling networks rather than a single pathway. Understanding these intricate signals is key to developing new human tumor development therapies.

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Last Updated: Jul 8, 2026

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

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

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Area of Science:

  • Cellular Biology
  • Oncology
  • Molecular Biology

Background:

  • Oncogene-induced senescence is a crucial tumor suppression mechanism.
  • Current models lack a unified framework integrating diverse senescence-inducing signals.
  • Key proposed triggers include DNA damage, replicative stress, and oxidative stress.

Purpose of the Study:

  • To integrate current models of oncogene-induced senescence.
  • To provide new insights into signals suppressing human tumor development.
  • To highlight the complexity of senescence regulatory networks.

Main Methods:

  • Review of existing literature on oncogene-induced senescence.
  • Analysis of signaling pathways involving Rb and p53.
  • Integration of data on various senescence-promoting insults.

Main Results:

  • Senescence is regulated by a complex signaling network, not a single linear pathway.
  • Multiple proteins cooperate to establish senescence, with limiting signals dependent on the initiating event and tissue type.
  • Signals converge through Rb and p53 but use distinct intermediaries.

Conclusions:

  • A unified model for oncogene-induced senescence is needed.
  • Understanding the complex network is vital for targeting human tumor development.
  • Further research into specific signaling intermediaries will advance cancer suppression strategies.