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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...

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...

DNA Damage Can Stall the Cell Cycle

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Negative Regulator Molecules

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Bystander Effect

Bystander Effect

The discussion of bullying highlights the problem of witnesses not intervening to help a victim. This is a common occurrence, as the following well-publicized event demonstrates. In 1964, in Queens, New York, a 19-year-old woman named Kitty Genovese was attacked by a person with a knife near the back entrance to her apartment building and again in the hallway inside her apartment building. When the attack occurred, she screamed for help numerous times and eventually died from her stab wounds.

The Intrinsic Apoptotic Pathway

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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...

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Related Experiment Video

Updated: Apr 29, 2026

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

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

Published on: December 30, 2025

p53 keeps bystanders at the gates.

Michael A Fray¹, Stephen C Bunnell²

¹Program in Immunology, Sackler School of Graduate Biomedical Sciences, Tufts University School of Medicine, Boston, MA 02111, USA.

|May 20, 2014

Summary

This summary is machine-generated.

The tumor suppressor p53 halts the proliferation of T cells that mistakenly target the body's own tissues. This finding is crucial for understanding and potentially treating autoimmune diseases.

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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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Area of Science:

Immunology
Molecular Biology
Autoimmunity

Background:

Self-reactive T cells, known as bystander cells, can inappropriately expand and drive autoimmune conditions.
Understanding the regulatory mechanisms controlling T cell proliferation is vital for preventing autoimmunity.

Purpose of the Study:

To investigate the role of the tumor suppressor p53 in regulating T cell proliferation.
To determine if p53 influences T cell responses in the absence of specific antigen recognition.

Main Methods:

The study utilized mouse models and in vitro cell culture systems.
Researchers examined the effects of cytokine stimulation on T cells with varying p53 expression levels.

Main Results:

Watanabe et al. demonstrated that p53 actively suppresses the proliferation of T cells.
This suppression occurs in a cytokine-dependent manner, even when T cells are not encountering their specific antigens.
p53 acts as a critical checkpoint to prevent the expansion of potentially self-reactive T cells.

Conclusions:

The tumor suppressor p53 plays a key role in preventing the inappropriate expansion of bystander T cells.
Targeting p53 pathways could offer novel therapeutic strategies for autoimmune diseases.