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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.
Covalently Linked Protein Regulators02:04

Covalently Linked Protein Regulators

Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein.
Nucleotide Excision Repair01:38

Nucleotide Excision Repair

DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...

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Related Experiment Video

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Purification of Ubiquitinated p53 Proteins from Mammalian Cells
10:55

Purification of Ubiquitinated p53 Proteins from Mammalian Cells

Published on: March 21, 2022

A role for Numb in p53 stabilization.

Stephanie Carter1, Karen H Vousden

  • 1The Beatson Institute for Cancer Research, Garscube Estate, Switchback Road, Glasgow, UK.

Genome Biology
|May 22, 2008
PubMed
Summary

The cell-fate determinant Numb activates the tumor suppressor p53. Loss of Numb in breast cancer reduces p53 tumor suppression and activates the oncogene Notch.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Numb is a cell-fate determinant involved in cell signaling pathways.
  • Numb has a newly identified role in activating the tumor suppressor protein p53.
  • Aberrant Notch signaling and impaired p53 function are hallmarks of many cancers, particularly breast cancer.

Purpose of the Study:

  • To investigate the functional consequences of Numb loss in breast cancer.
  • To elucidate the interplay between Numb, p53, and Notch signaling in the context of tumorigenesis.

Main Methods:

  • Utilized molecular biology techniques to assess Numb expression levels in breast cancer models.
  • Performed functional assays to evaluate the impact of Numb on p53 activity.
  • Analyzed Notch pathway activation in response to Numb modulation.

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

Published on: December 30, 2025

Yeast As a Chassis for Developing Functional Assays to Study Human P53
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Yeast As a Chassis for Developing Functional Assays to Study Human P53

Published on: August 4, 2019

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Last Updated: Jul 5, 2026

Purification of Ubiquitinated p53 Proteins from Mammalian Cells
10:55

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

Published on: December 30, 2025

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

Main Results:

  • Loss of Numb leads to decreased activation of the tumor suppressor p53.
  • Numb deficiency results in the upregulation and activation of the Notch oncogene.
  • These molecular alterations are associated with impaired tumor suppression.

Conclusions:

  • Numb plays a critical role in maintaining tumor suppression through p53 activation.
  • Loss of Numb in breast cancer promotes oncogenic signaling via Notch, contributing to tumor progression.
  • Targeting Numb or its downstream pathways may offer therapeutic strategies for breast cancer.