Related Experiment Video

Updated: Jun 20, 2026

Cell Death Associated with Abnormal Mitosis Observed by Confocal Imaging in Live Cancer Cells
15:53

Cell Death Associated with Abnormal Mitosis Observed by Confocal Imaging in Live Cancer Cells

Published on: August 21, 2013

Chemotherapy induces NEDP1-mediated destabilization of MDM2

I R Watson1, B K Li, O Roche

  • 1Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada.

Oncogene
|September 29, 2009
PubMed

Insights

The ubiquitin-like NEDD8 pathway regulates MDM2 stability. NEDP1, a chemotherapy-induced enzyme, destabilizes MDM2, activating p53 and enhancing cancer cell death.

Area of Science:

  • Molecular biology
  • Cancer research
  • Cellular signaling

Background:

  • MDM2 (E3 ligase) targets p53 for degradation.
  • Cellular stress, like DNA damage, can destabilize MDM2, activating p53.
  • Understanding MDM2 regulation is crucial for cancer therapy.

Purpose of the Study:

  • To investigate the regulation of MDM2 stability.
  • To identify molecular mechanisms linking chemotherapy to p53 activation.
  • To explore the role of the NEDD8 pathway in MDM2 regulation.

Main Methods:

  • Investigated MDM2 stability regulation via the ubiquitin-like NEDD8 pathway.
  • Identified NEDP1 as a key isopeptidase.
  • Utilized RNA interference (RNAi) to knock down NEDP1 in tumor cells.

Main Results:

  • NEDP1 deneddylates MDM2, leading to its destabilization and p53 activation.
  • Knockdown of NEDP1 prevented MDM2 degradation and conferred chemoresistance.
  • MDM2 stability regulated by NEDP1 is a determinant of chemotherapy-induced cell death.

Conclusions:

  • NEDP1-mediated regulation of MDM2 stability is a critical pathway in chemotherapy response.
  • Targeting the NEDP1-MDM2 interaction could enhance p53-dependent cancer cell death.
  • This pathway represents a common mechanism in chemotherapy-induced apoptosis.

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...
Drugs that Destabilize Microtubules01:10

Drugs that Destabilize Microtubules

Microtubules are dynamic structures and can be regulated by microtubule targeting agents (MTAs). Microtubule destabilizing drugs are a class of MTAs that destabilize and prevent microtubules' polymerization. Both natural and synthetic chemicals can be found under this class of drugs. Vincristine and vinblastine, two vinca alkaloids, and colchicine were among the first to be discovered. These drugs can affect cells in various ways, either by inducing a change in cell morphology, preventing...
Chemotherapy-Induced Nausea and Vomiting: Neurokinin-1 Receptor Antagonists01:28

Chemotherapy-Induced Nausea and Vomiting: Neurokinin-1 Receptor Antagonists

Neurokinin 1 (NK1) receptors are distributed across the GI tract, vagal afferents, and key CNS regions including the central vomiting center and chemoreceptor trigger zone (CTZ) Chemotherapy agents stimulate enterochromaffin cells in the gastrointestinal (GI) tract to release large amounts of substance P (SP). SP is a neuropeptide released by specific sensory nerves in response to many different stressors, including those in the GI mucosa affected by chemotherapy.  SP binds and activates these...
Treatment Resistant Cancers02:56

Treatment Resistant Cancers

Cancer is the second leading cause of death in the United States. A cancer cell is genetically unstable and hence can mutate faster. They can also modify their microenvironment and escape immune surveillance. The difficulties in treating cancer are further compounded by the emergence of rapid resistance to anticancer drugs. The most common ways to attain resistance in cancer cells include alteration in drug transport and metabolism, modification of drug target, elevated DNA damage response, or...
Drugs that Stabilize Microtubules01:15

Drugs that Stabilize Microtubules

Microtubules are dynamic structures that undergo cycles of catastrophe and rescue. The microtubules play a central role in cell division by forming the spindle apparatus for segregating the chromosomes. This makes them ideal targets for regulating dividing cells in tumors and malignant cancer cells. Microtubule stabilizing drugs help stabilize the microtubule formation and promote its polymerization. Paclitaxel was the first microtubule stabilizing agent used as anticancer drug in chemotherapy...
Destabilization of Microtubules01:45

Destabilization of Microtubules

The destabilization of microtubules can occur during different stages of the microtubule lifecycle, such as nucleation or elongation. It can take place at either end of the microtubule or in the microtubule lattices as a whole. The lifespan of individual microtubules within a cell varies according to the cell type and stage of the cell cycle. During interphase, the lifespan of the microtubule is about 30 minutes, while during cell division, it is about 15 minutes. In axonal microtubules of...