Related Experiment Video

Updated: Aug 16, 2026

Techniques to Induce and Quantify Cellular Senescence
06:51

Techniques to Induce and Quantify Cellular Senescence

Published on: May 1, 2017

E2F-1 is a critical modulator of cellular senescence in human cancer

Chaehwa Park1, Inkyoung Lee, Won Ki Kang

  • 1Cancer Center, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, 135-710, Korea. cpark@smc.samsung.co.kr

International Journal of Molecular Medicine
|April 6, 2006
PubMed

Insights

E2F1 acts as a barrier to cellular senescence, a process that can prevent cancer. Inhibiting E2F1 in cancer cells induces senescence, suggesting E2F1 as a potential cancer therapy target.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Oncology

Background:

  • Cellular senescence limits proliferation and may suppress cancer progression.
  • The transcription factor E2F1 is crucial for cell cycle progression and is a target of tumor suppressor Rb.

Purpose of the Study:

  • To investigate the role of E2F1 in the induction of cellular senescence.
  • To explore the potential of targeting E2F1 for cancer therapy.

Main Methods:

  • Transfection of human cancer cells with small interfering RNA (siE2F1) to deplete E2F1.
  • Assessment of replicative senescence markers and SA-beta-Gal staining.
  • Overexpression of E2F1 in cancer cells to evaluate senescence induction.

Main Results:

  • Depletion of E2F1 in human cancer cells induced replicative senescence markers and SA-beta-Gal activity.
  • Cancer cells overexpressing E2F1 were resistant to senescence induction.
  • E2F1 depletion-induced senescence was independent of Rb and p53 integrity.

Conclusions:

  • E2F1 is a critical barrier to the induction of cellular senescence.
  • E2F1 depletion can induce cancer cell senescence independently of Rb and p53.
  • Targeting E2F1 may offer a novel therapeutic strategy for cancer treatment.

More Related Videos

A Quantitative Measurement of Reactive Oxygen Species and Senescence-associated Secretory Phenotype in Normal Human Fibroblasts During Oncogene-induced Senescence13:59

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

SA-β-Galactosidase-Based Screening Assay for the Identification of Senotherapeutic Drugs07:39

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

Published on: June 28, 2019

Related Concept Videos

Negative Regulator Molecules01:23

Negative Regulator Molecules

Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
38.1K
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...
26.6K
Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
18.2K
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...
7.6K
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...
4.2K
Abnormal Proliferation02:23

Abnormal Proliferation

Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
5.0K