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Abnormal Proliferation

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...

Negative Regulator Molecules

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 Cycle

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...

Interactions Between Signaling Pathways

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...

The Intrinsic Apoptotic Pathway

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...

Covalently Linked Protein Regulators

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....

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Related Experiment Video

Updated: Oct 10, 2025

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

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

Published on: August 4, 2019

The Basally Expressed p53-Mediated Homeostatic Function.

Isha Nagpal¹, Zhi-Min Yuan¹

¹John B. Little Center for Radiation Sciences, Harvard T. H. Chan School of Public Health, Boston, MA, United States.

Frontiers in Cell and Developmental Biology

|December 10, 2021

Summary

Basal p53 protein, even at low levels, acts as a crucial barrier against anabolic metabolism to maintain cellular homeostasis. Understanding this function offers new insights into tumor suppression and p53

Keywords:

basal p53 homeostasis metabolism p53-mediated barrier tumor suppression

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Last Updated: Oct 10, 2025

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

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

Published on: August 4, 2019

Purification of Ubiquitinated p53 Proteins from Mammalian Cells

Purification of Ubiquitinated p53 Proteins from Mammalian Cells

Published on: March 21, 2022

Quantifying Tissue-Specific Proteostatic Decline in Caenorhabditis elegans

Quantifying Tissue-Specific Proteostatic Decline in Caenorhabditis elegans

Published on: September 7, 2021

Area of Science:

Molecular Biology
Cancer Biology
Cellular Homeostasis

Background:

p53 protein functions can be compromised by decreased levels or activity, not just mutations.
Elevated MDM2/MDMX or HPV E6 protein leads to p53 degradation, contributing to cancers.
p53 downregulation accompanies cell proliferation and is essential for oncogene-driven transformation.

Purpose of the Study:

To review findings on basal p53-mediated activities.
To propose a model where basal p53 preserves homeostasis by inhibiting anabolic metabolism.
To highlight the need for further research into p53's homeostatic and tumor-suppressive roles.

Main Methods:

Literature review summarizing existing research on basal p53.
Analysis of evidence linking p53 downregulation to carcinogenesis.
Exploration of p53's role in maintaining homeostasis under non-stress conditions.

Main Results:

Reduced basal p53 levels are associated with disrupted homeostasis.
Basally expressed p53, despite low abundance, appears to mediate homeostatic functions.
p53 acts as a barrier to anabolic metabolism, preserving cellular balance.

Conclusions:

Basal p53 plays a critical role in maintaining homeostasis, likely by regulating metabolism.
Further functional characterization of basal p53 is needed.
Understanding p53's homeostatic function provides novel insights into tumor suppression.