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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...
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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.
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...
Molecular Factors Affecting Cell Division01:27

Molecular Factors Affecting Cell Division

Several external and internal factors influence the initiation and inhibition of cell division. For instance, the death of nearby cells or the release of human growth hormone (hGH) promotes cell division. In contrast, lack of hGH or crowding of cells can inhibit cell division.
Several proteins function as internal regulators to ensure each cell cycle stage is completed faithfully before proceeding to the next. Regulator molecules may act directly or influence the activity or production of other...
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The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...

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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

p53 dynamics control cell fate.

Jeremy E Purvis1, Kyle W Karhohs, Caroline Mock

  • 1Department of Systems Biology, Harvard Medical School, Boston, MA 02115, USA.

Science (New York, N.Y.)
|June 16, 2012
PubMed
Summary
This summary is machine-generated.

Altering the pulsing behavior of the tumor suppressor p53 protein using timed drug additions can change cell fate. This study demonstrates how p53 protein dynamics influence DNA damage recovery and senescence.

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Published on: August 4, 2019

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Area of Science:

  • Cellular dynamics
  • Molecular signaling
  • Cancer biology

Background:

  • Cells communicate using complex molecular signals with dynamic patterns.
  • The tumor suppressor p53 protein exhibits varied dynamic behavior, including pulsed responses to DNA damage.

Purpose of the Study:

  • To investigate if altering p53 protein dynamics can influence cell fate decisions.
  • To identify specific drug treatment strategies to modify p53 signaling patterns.

Main Methods:

  • Utilized a computational model to simulate cellular responses.
  • Designed and tested precise sequences of drug additions to modulate p53 dynamics.
  • Analyzed downstream gene expression and cell fate outcomes (recovery vs. senescence).

Main Results:

  • A specific sequence of timed drug additions successfully shifted p53 from pulsed to sustained signaling.
  • Sustained p53 signaling altered the expression of downstream genes compared to pulsed signaling.
  • Pulsed p53 signaling promoted DNA damage recovery, while sustained signaling led to frequent senescence.

Conclusions:

  • The dynamic behavior of proteins, like p53, is a critical component of cellular signaling.
  • Controlling protein dynamics offers a novel strategy to influence cellular fate, with implications for cancer therapy.