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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...
Loss of Tumor Suppressor Gene Functions01:12

Loss of Tumor Suppressor Gene Functions

Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
Loss of Tumor Suppressor Gene Functions01:12

Loss of Tumor Suppressor Gene Functions

Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
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...
Cancer-Critical Genes II: Tumor Suppressor Genes01:05

Cancer-Critical Genes II: Tumor Suppressor Genes

Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...

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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

Mitochondrial dysfunction impairs tumor suppressor p53 expression/function.

Shannon Compton1, Chul Kim, Nicholas B Griner

  • 1Pioneer Valley Life Sciences Institute, Springfield, Massachusetts 01107, USA.

The Journal of Biological Chemistry
|April 20, 2011
PubMed
Summary
This summary is machine-generated.

Mitochondrial dysfunction impairs tumor suppressor p53 expression and activity, protecting cells from cancer-inducing radiation. Restoring mitochondrial function can reverse these effects, offering insights into cancer therapy.

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Area of Science:

  • Cell Biology
  • Cancer Research
  • Mitochondrial Biology

Background:

  • Mitochondria are increasingly recognized for their role in tumor suppression.
  • The precise mechanisms linking mitochondrial dysfunction to cancer development remain unclear.
  • The tumor suppressor protein p53 is crucial in cellular responses to damage.

Purpose of the Study:

  • To investigate the relationship between mitochondrial dysfunction and the tumor suppressor protein p53.
  • To understand how impaired mitochondrial function affects p53-dependent responses to DNA damage.

Main Methods:

  • Utilized respiration-deficient (Res(-)) mammalian cell mutants with defects in oxidative phosphorylation.
  • Assessed p53 expression and activity following gamma-irradiation (γIR) in Res(-) cells.
  • Employed conditional systems to study the reversibility of mitochondrial dysfunction effects.

Main Results:

  • Normal mitochondrial function is essential for γIR-induced cell death, a p53-dependent process.
  • Res(-) cells exhibit resistance to γIR-induced cell death due to impaired p53.
  • Specific defects in complex I assembly or mitochondrial protein synthesis differentially affect p53 protein levels.
  • γIR-induced p53 activity is compromised in all Res(-) cells, regardless of p53 expression levels.
  • The impact of mitochondrial dysfunction on p53 is reversible.

Conclusions:

  • Mitochondrial dysfunction disrupts p53-mediated tumor suppression.
  • p53 expression and activity are sensitive to specific types of mitochondrial defects.
  • Reversibility of mitochondrial function suggests potential therapeutic strategies for cancer.