Related Experiment Video

Updated: May 19, 2026

Purification of Ubiquitinated p53 Proteins from Mammalian Cells
10:55

Purification of Ubiquitinated p53 Proteins from Mammalian Cells

Published on: March 21, 2022

BMK1 is involved in the regulation of p53 through disrupting the PML-MDM2 interaction

Q Yang1, L Liao, X Deng

  • 1Department of Immunology and Microbial Science, The Scripps Research Institute, La Jolla, CA, USA.

Oncogene
|August 8, 2012
PubMed

Insights

Big MAP kinase 1 (BMK1) suppresses p53 by disrupting PML-MDM2 interactions. Inhibiting BMK1 with doxorubicin enhances tumor cell apoptosis and regression, suggesting a new chemotherapy strategy.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Promyelocytic leukemia protein (PML) regulates the p53 tumor suppressor.
  • PML interacts with p53 and MDM2, a key regulator of p53 stability.
  • Doxorubicin chemotherapy leverages PML to enhance p53 activation via MDM2 sequestration.

Purpose of the Study:

  • To investigate the role of Big MAP kinase 1 (BMK1) in PML-mediated p53 regulation.
  • To explore the synergistic effect of BMK1 inhibition and doxorubicin on tumor suppression.

Main Methods:

  • Assessed the interaction between BMK1, PML isoform IV, and MDM2.
  • Investigated the impact of BMK1 activity on doxorubicin-induced MDM2 nucleolar sequestration.
  • Evaluated tumor cell apoptosis in vitro and tumor regression in vivo.

Main Results:

  • Activated BMK1 preferentially associates with PML isoform IV, disrupting the PML-MDM2 interaction.
  • BMK1 deactivation combined with doxorubicin synergistically enhanced MDM2 nucleolar sequestration.
  • This synergistic effect led to increased PML-mediated p53 upregulation, resulting in tumor cell apoptosis and in vivo tumor regression.

Conclusions:

  • BMK1 activity suppresses p53 by inhibiting the PML-MDM2 interaction.
  • Pharmacological inhibition of BMK1 can potentiate doxorubicin's anticancer effects.
  • Targeting BMK1 represents a promising strategy to enhance chemotherapy efficacy.

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

Mechanism of Kemeng Fang's Inhibition of Podocyte Apoptosis in Rats with Membranous Nephropathy through the PI3K/AKT Signaling Pathway07:15

Mechanism of Kemeng Fang's Inhibition of Podocyte Apoptosis in Rats with Membranous Nephropathy through the PI3K/AKT Signaling Pathway

Published on: August 23, 2024

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