Related Experiment Video

Updated: Jun 6, 2026

Functionalized Spirocyclic Heterocycle Synthesis and Cytotoxicity Assay
05:17

Functionalized Spirocyclic Heterocycle Synthesis and Cytotoxicity Assay

Published on: February 9, 2021

A small-molecule inhibitor of MDMX activates p53 and induces apoptosis

Hongbo Wang1, Xujun Ma, Shumei Ren

  • 1Albany Medical College, MC 165, 47 New Scotland Avenue, Albany, NY 12208, USA.

Molecular Cancer Therapeutics
|November 16, 2010
PubMed

Insights

A novel compound inhibits MDMX expression, restoring tumor suppressor p53 activity and inducing cancer cell apoptosis. This approach offers a promising strategy for developing new cancer therapies, especially when combined with existing treatments.

Area of Science:

  • Oncology
  • Molecular Biology
  • Drug Discovery

Background:

  • p53 tumor suppressor inactivation by regulators like MDM2 and MDMX is crucial in human cancer development.
  • Restoring p53 activity by targeting its repressors is a potential anticancer strategy.
  • MDMX inhibits p53 function, and therapies targeting MDM2-p53 interaction are less effective in MDMX-high cancers.

Purpose of the Study:

  • To identify small molecules that inhibit MDMX expression in cancer cells.
  • To evaluate the therapeutic potential of targeting MDMX for cancer treatment.

Main Methods:

  • Reporter-based drug screening to identify MDMX inhibitors.
  • Treatment of MCF-7 cells with a benzofuroxan derivative (NSC207895).
  • Analysis of p53 activation, proapoptotic gene expression, and cell viability.

Main Results:

  • A benzofuroxan derivative (NSC207895) was identified that inhibits MDMX expression.
  • NSC207895 treatment activated p53, increasing proapoptotic gene expression (PUMA, BAX, PIG3) in MCF-7 cells.
  • The compound induced apoptosis and showed additive effects with nutlin-3a in reducing cancer cell viability.

Conclusions:

  • Targeting MDMX expression with small molecules is a viable therapeutic strategy.
  • MDMX inhibitors can restore p53 activity and induce cancer cell apoptosis.
  • Combined therapies targeting MDMX and MDM2 may offer enhanced anti-cancer benefits.

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

Knockdown of FAM83A to Verify Its Role in Cervical Cancer Cell Growth and Cisplatin Sensitivity04:20

Knockdown of FAM83A to Verify Its Role in Cervical Cancer Cell Growth and Cisplatin Sensitivity

Published on: February 9, 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...
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...
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.
The Extrinsic Apoptotic Pathway01:17

The Extrinsic Apoptotic Pathway

The extrinsic apoptotic pathway is initiated when extracellular death-inducing signals, such as specific cytokines, activate the death receptors expressed on the cell surface. The immune cells involved in this pathway are natural killer cells (NK cells) and cytotoxic T-lymphocytes. NK cells are critical in innate immune response, while cytotoxic T-lymphocytes are associated with adaptive immune response. These cells recognize specific receptors expressed on the altered cells and activate...