Related Experiment Video

Updated: Jun 30, 2026

Analysis of Cell Cycle Position in Mammalian Cells
12:19

Analysis of Cell Cycle Position in Mammalian Cells

Published on: January 21, 2012

Regulation of the Arf/p53 tumor surveillance network by E2F

P J Iaquinta1, A Aslanian, J A Lees

  • 1Center for Cancer Research, Massachusetts Institute of Technology, Cambridge, 02139, USA.

Cold Spring Harbor Symposia on Quantitative Biology
|July 28, 2006
PubMed

Insights

The E2F transcription factor directly regulates the Arf/p53 tumor surveillance network. E2F acts as a sensor, determining if cancer-preventing pathways are activated during cell proliferation.

Area of Science:

  • Molecular Biology
  • Cancer Biology
  • Cell Cycle Regulation

Background:

  • Cell cycle deregulation is crucial in cancer development.
  • Retinoblastoma protein (pRB) inactivation is a key tumorigenic event.
  • pRB regulates E2F transcription factors, which control cell proliferation and apoptosis.

Purpose of the Study:

  • To investigate the role of E2F transcription factors in regulating the Arf/p53 tumor surveillance network.
  • To determine how E2F activity influences the expression of Arf in response to cellular signals.

Main Methods:

  • Analysis of E2F family member interactions with the Arf gene.
  • Assessing the impact of oncogenic stress on E2F-Arf association and Arf transcription.
  • Studying the transcriptional regulation of Arf by specific E2F members.

Main Results:

  • In normal cells, E2F3 silences Arf transcription.
  • Oncogenic stress leads to E2F1, E2F2, and E2F3A associating with Arf and promoting its transcription.
  • E2F transcription factors directly modulate Arf expression.

Conclusions:

  • E2F transcription factors play a direct role in regulating the Arf/p53 tumor suppressor pathway.
  • E2F may function as a critical sensor distinguishing normal proliferation from oncogenic stress.
  • These findings offer insights into how the cell cycle and tumor surveillance networks are integrated.

More Related Videos

Yeast As a Chassis for Developing Functional Assays to Study Human P5314:57

Yeast As a Chassis for Developing Functional Assays to Study Human P53

Published on: August 4, 2019

Monitoring eIF4F Assembly by Measuring eIF4E-eIF4G Interaction in Live Cells08:47

Monitoring eIF4F Assembly by Measuring eIF4E-eIF4G Interaction in Live Cells

Published on: May 1, 2020

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.
DNA Damage can Stall the Cell Cycle02:36

DNA Damage can Stall the Cell Cycle

In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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 daughter...
mTOR Signaling and Cancer Progression03:03

mTOR Signaling and Cancer Progression

The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
DNA Damage Can Stall the Cell Cycle02:36

DNA Damage Can Stall the Cell Cycle

In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
PI3K/mTOR/AKT Signaling Pathway01:22

PI3K/mTOR/AKT Signaling Pathway

The mammalian target of rapamycin  (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1  (mTORC1) and mTOR complex 2  (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast,  mTORC2 consists of a rapamycin-insensitive companion...