Related Experiment Video

Updated: Aug 16, 2026

Yeast As a Chassis for Developing Functional Assays to Study Human P53
14:57

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

Published on: August 4, 2019

p53-induced apoptosis as a safeguard against cancer

C Asker1, K G Wiman, G Selivanova

  • 1Cancer Center Karolinska, Karolinska Institute, Stockholm, SE-171 77, Sweden.

Biochemical and Biophysical Research Communications
|November 5, 1999
PubMed

Insights

The tumor suppressor p53 induces apoptosis, or programmed cell death, to eliminate cancerous cells. ARF protein stabilizes p53, enhancing its tumor-suppressing function.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cellular Biology

Background:

  • The p53 protein is a critical tumor suppressor involved in apoptosis.
  • Cellular stresses like DNA damage and oncogene activation trigger p53-dependent apoptosis.
  • ARF (Alternative Reading Frame) protein, encoded by the INK4a locus, stabilizes p53.

Purpose of the Study:

  • To elucidate the role of ARF in p53-mediated apoptosis.
  • To understand how ARF prevents p53 degradation in response to oncogene activation.
  • To explore the mechanisms by which p53 promotes apoptosis.

Main Methods:

  • Investigating the interaction between ARF and p53.
  • Analyzing p53 stabilization upon oncogene activation in the presence of ARF.
  • Studying p53 target gene transactivation and repression.
  • Examining transcription-independent p53 functions.

Main Results:

  • ARF prevents p53 degradation, thereby inducing p53 in response to oncogene activation.
  • This ARF-mediated stabilization of p53 ensures the elimination of nascent tumor cells via apoptosis.
  • p53 induces apoptosis through various mechanisms, including gene transactivation, gene down-regulation, and transcription-independent pathways.

Conclusions:

  • ARF plays a crucial role in tumor suppression by stabilizing p53 and promoting apoptosis.
  • The frequent inactivation of the ARF/p53 pathway in tumors suggests its importance in cancer development.
  • Understanding these mechanisms is key to developing targeted cancer therapies.

More Related Videos

Purification of Ubiquitinated p53 Proteins from Mammalian Cells10:55

Purification of Ubiquitinated p53 Proteins from Mammalian Cells

Published on: March 21, 2022

Detection of Aggregation-Prone Behavior in Mutant P53 V157F Breast Cancer Cells Using Multipoint Thioflavin T Fluorescence04:56

Detection of Aggregation-Prone Behavior in Mutant P53 V157F Breast Cancer Cells Using Multipoint Thioflavin T Fluorescence

Published on: December 30, 2025

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...
The Intrinsic Apoptotic Pathway01:31

The Intrinsic Apoptotic Pathway

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...
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...
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...