Related Experiment Video

Updated: May 25, 2026

Detection of Aggregation-Prone Behavior in Mutant P53 V157F Breast Cancer Cells Using Multipoint Thioflavin T Fluorescence
04:56

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

Published on: December 30, 2025

Dmp1 physically interacts with p53 and positively regulates p53's stability, nuclear localization, and function

Donna P Frazier1, Robert D Kendig, Fumitake Kai

  • 1Department of Pathology and Cancer Biology, and Graduate Program in Molecular Medicine, Wake Forest University Health Sciences, Medical Center Boulevard, Winston-Salem, North Carolina 27157, USA.

Cancer Research
|February 15, 2012
PubMed

Insights

The tumor suppressor Dmp1 directly binds to and stabilizes p53, promoting cell-cycle arrest independently of Arf. This interaction enhances p53 levels and activity, revealing a new mechanism for tumor suppression.

Area of Science:

  • Molecular Biology
  • Oncology
  • Cell Biology

Background:

  • Dmp1 is a tumor suppressor that activates the Arf/p53 pathway.
  • Emerging evidence suggests Dmp1 may activate p53 independently of Arf.

Purpose of the Study:

  • To define the Arf-independent function of Dmp1 in tumor suppression.
  • To elucidate the mechanism of Dmp1-mediated p53 activation.

Main Methods:

  • Co-immunoprecipitation to assess Dmp1-p53 interaction.
  • Western blotting to evaluate p53 ubiquitination and levels.
  • Quantitative PCR to analyze p53 target gene expression.
  • Studies in knockout cell lines (p53(-/-);Arf(-/-), Dmp1(-/-), p53(-/-), Arf(-/-)).

Main Results:

  • Dmp1 directly interacts with p53 via specific domains.
  • Dmp1 antagonizes Mdm2-mediated p53 ubiquitination, increasing p53 stability and nuclear localization.
  • Dmp1 enhances p53 transcriptional activity synergistically, independent of Dmp1's DNA-binding activity.
  • Genotoxic responses are more severely impaired in Dmp1/p53 deficient cells than in Arf deficient cells.

Conclusions:

  • Dmp1 directly binds to p53, stabilizing it and promoting its tumor suppressor functions.
  • This interaction represents a novel, Arf-independent mechanism of p53 activation.
  • Dmp1-p53 interaction offers a new therapeutic target for cancer treatment.

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

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

Related Concept Videos

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...
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...
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...
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.
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...
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...