Related Experiment Video

Updated: Sep 3, 2026

Procedure and Key Optimization Strategies for an Automated Capillary Electrophoretic-based Immunoassay Method
09:32

Procedure and Key Optimization Strategies for an Automated Capillary Electrophoretic-based Immunoassay Method

Published on: September 10, 2017

Analysis of human p53 proteins and mRNA levels in normal and transformed cells

G Matlashewski, L Banks, D Pim

    European Journal of Biochemistry
    |February 3, 1986
    PubMed

    Insights

    p53 mRNA levels are similar in normal and transformed human cells, but the synthesized p53 protein shows structural variations. Cancer patient antibodies recognize multiple p53 protein epitopes.

    Area of Science:

    • Molecular Biology
    • Cancer Research
    • Immunology

    Background:

    • The p53 protein is a critical tumor suppressor involved in cell cycle regulation and apoptosis.
    • Alterations in p53 are common in human cancers, making it a key target for research.
    • Understanding p53 expression and structure in both normal and cancerous cells is crucial for cancer diagnostics and therapeutics.

    Purpose of the Study:

    • To investigate the levels and structure of p53 mRNA and protein in various human transformed cell lines and normal fibroblasts.
    • To characterize the epitopes recognized by anti-p53 antibodies from cancer patients.

    Main Methods:

    • Analysis of p53 mRNA and protein steady-state and translatable levels.
    • In vitro protein synthesis programmed by cell mRNA.
    • Pulse labeling and immunoprecipitation assays using anti-p53 antibodies.
    • Synthesis of p53-beta-galactosidase fusion proteins for antibody characterization.

    Main Results:

    • Steady-state and translatable p53 mRNA levels were comparable in normal and transformed human cells.
    • Synthesized p53 protein exhibited structural heterogeneity across different cell types.
    • Immunoprecipitation confirmed that in vitro synthesized p53 matched in vivo synthesized p53 in SV80 and COLO 320 cells.
    • p53 protein was not detectable in HeLa and normal foreskin fibroblast cells via pulse-labeling.
    • Antibodies from cancer patient sera recognized epitopes in both N-terminal and C-terminal regions of the p53 molecule.

    Conclusions:

    • p53 protein structure, not mRNA levels, varies between normal and transformed human cells.
    • Cancer patient-derived anti-p53 antibodies are polyclonal, targeting diverse epitopes on the p53 protein.

    More Related Videos

    Yeast As a Chassis for Developing Functional Assays to Study Human P5314:57

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

    Published on: August 4, 2019

    Detection of Aggregation-Prone Behavior in Mutant P53 V157F Breast Cancer Cells Using Multipoint Thioflavin T Fluorescence04:56

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

    Published on: December 30, 2025

    Related Concept Videos

    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.
    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...
    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...
    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...