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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
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Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...
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...
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Mitogens and the Cell Cycle02:38

Mitogens and the Cell Cycle

Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...
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Related Experiment Video

Updated: Jul 4, 2026

Techniques to Induce and Quantify Cellular Senescence
06:51

Techniques to Induce and Quantify Cellular Senescence

Published on: May 1, 2017

Oncogene-induced senescence relayed by an interleukin-dependent inflammatory network.

Thomas Kuilman1, Chrysiis Michaloglou, Liesbeth C W Vredeveld

  • 1Division of Molecular Genetics, The Netherlands Cancer Institute, 1066 CX Amsterdam, The Netherlands.

Cell
|June 17, 2008
PubMed
Summary

Oncogene-induced cellular senescence (OIS) prevents cancer by activating an inflammatory response. Interleukin-6 (IL-6) is crucial for both initiating and maintaining OIS, highlighting its dual role in cancer protection.

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Published on: July 12, 2022

Area of Science:

  • Cellular senescence
  • Cancer biology
  • Inflammation

Background:

  • Oncogene-induced cellular senescence (OIS) is a key mechanism for eliminating early cancer cells.
  • The molecular pathways linking OIS to inflammation are not fully understood.

Purpose of the Study:

  • To investigate the role of inflammation in OIS.
  • To elucidate the function of interleukin-6 (IL-6) in OIS.
  • To identify key regulators of the OIS-associated inflammatory network.

Main Methods:

  • Combined genetic and bioinformatic analysis.
  • Gene expression profiling.
  • Cytokine assays.
  • Analysis of human colon adenomas.

Main Results:

  • OIS activates a specific inflammatory transcriptome, including IL-6.
  • IL-6 plays a dual role: paracrine mitogen and cell-autonomous mediator of senescence.
  • Depletion of IL-6 disrupts the inflammatory network and impairs OIS.
  • Transcription factor C/EBPbeta collaborates with IL-6 to enhance inflammatory gene expression (e.g., IL-8).
  • IL-8 is found in senescent cells within human colon adenomas.

Conclusions:

  • Interleukin-6 is essential for both the induction and maintenance of oncogene-induced cellular senescence.
  • The study proposes a model where interleukins link senescence, inflammation, and cancer development.
  • Targeting IL-6 or related inflammatory pathways may offer novel cancer prevention or treatment strategies.