Related Experiment Video

Updated: Aug 8, 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 suppression of arsenite-induced mitotic catastrophe is mediated by p21CIP1/WAF1

B Frazier Taylor1, Samuel C McNeely, Heather L Miller

  • 1Department of Pharmacology and Toxicology, University of Louisville, 570 South Preston Street, Suite 221, Louisville, KY 40202, USA.

The Journal of Pharmacology and Experimental Therapeutics
|April 15, 2006
PubMed

Insights

Arsenic trioxide induces cell death in cancer cells, particularly when the p53 pathway is deficient. This study shows p53 prevents arsenite-induced mitotic catastrophe by regulating cell cycle proteins like p21CIP1/WAF1.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Arsenic trioxide is a chemotherapy agent for acute promyelocytic leukemia.
  • Arsenite sensitivity is linked to p53 pathway deficiencies.
  • Understanding arsenite's mechanism is crucial for its broader cancer treatment applications.

Purpose of the Study:

  • To investigate the role of p53 in arsenite-induced cell death.
  • To determine how p53 influences mitotic catastrophe and apoptosis.
  • To elucidate the molecular pathways involved in arsenite sensitivity.

Main Methods:

  • Utilized a tetracycline-off system to regulate p53 expression in TR9-7 cells.
  • Analyzed cell cycle progression, apoptosis, and protein stabilization following arsenite treatment.
  • Employed a pan-caspase inhibitor and siRNA to assess the roles of caspases and p21CIP1/WAF1.

Main Results:

  • Arsenite triggered cell cycle arrest independently of p53, but mitotic catastrophe was more pronounced in p53-deficient cells.
  • p53-deficient cells exhibited sustained cyclin B/CDC2 stabilization and caspase-3 activation, indicative of mitotic catastrophe.
  • p53 mediated the inactivation of cyclin B/CDC2 and mitotic release through p21CIP1/WAF1 induction.

Conclusions:

  • The p53 tumor suppressor protein plays a critical role in preventing arsenite-induced mitotic catastrophe.
  • p53's protective effect is mediated by the induction of p21CIP1/WAF1, which inactivates the cyclin B/CDC2 complex.
  • These findings highlight p53-dependent mechanisms influencing sensitivity to arsenite chemotherapy.

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...
Inhibition of Cdk Activity02:34

Inhibition of Cdk Activity

The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
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...
Anaphase Promoting Complex00:50

Anaphase Promoting Complex

The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...
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...