Related Experiment Video

Updated: Jun 24, 2026

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

Caveolin-1 regulates the antagonistic pleiotropic properties of cellular senescence through a novel Mdm2/p53-mediated

Janine N Bartholomew1, Daniela Volonte, Ferruccio Galbiati

  • 1Department of Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15261, USA.

Cancer Research
|March 26, 2009
PubMed

Insights

Caveolin-1 binds Mdm2, preventing Mdm2 from degrading p53. This stabilizes p53, up-regulates p21, and induces senescence, impacting cell growth and tumorigenesis.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cancer Research

Background:

  • The p53 tumor suppressor is tightly regulated by Mdm2.
  • Oxidative stress can trigger cellular senescence pathways.
  • Caveolin-1's role in p53 regulation and senescence is not fully understood.

Purpose of the Study:

  • To investigate the role of caveolin-1 in the Mdm2-p53 interaction.
  • To determine caveolin-1's function in oxidative stress-induced p53 stabilization and senescence.
  • To elucidate caveolin-1's contribution to cellular senescence and its impact on tumorigenesis.

Main Methods:

  • Co-immunoprecipitation to assess protein binding.
  • Western blotting to detect protein levels (p53, p21).
  • Cell culture experiments using human fibroblasts, caveolin-1 null MEFs, and oncogenic Ras-transformed cells.
  • In vitro and in vivo assays for cell growth and tumorigenesis.

Main Results:

  • Caveolin-1 directly binds to Mdm2.
  • Oxidative stress causes caveolin-1 to sequester Mdm2 from p53, stabilizing p53 and increasing p21(Waf1/Cip1) levels.
  • Caveolin-1 deficiency impairs p53/p21 pathway activation and senescence induction.
  • Caveolin-1 reintroduction or expression promotes senescence and influences Ras-transformed cell and breast cancer cell growth and tumorigenesis.

Conclusions:

  • Caveolin-1 is a novel Mdm2-binding protein that regulates p53 stability.
  • Caveolin-1 mediates oxidative stress-induced senescence through the p53/p21 pathway.
  • Caveolin-1 plays a critical role in the dual functions of senescence in cell growth and tumorigenesis.

More Related Videos

A Quantitative Measurement of Reactive Oxygen Species and Senescence-associated Secretory Phenotype in Normal Human Fibroblasts During Oncogene-induced Senescence13:59

A Quantitative Measurement of Reactive Oxygen Species and Senescence-associated Secretory Phenotype in Normal Human Fibroblasts During Oncogene-induced Senescence

Published on: August 12, 2018

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...
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...