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Cellular immortalization by a cDNA clone encoding the transformation-associated phosphoprotein p53.

J R Jenkins, K Rudge, G A Currie

    Nature
    |December 13, 1984
    PubMed
    Summary
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    Introducing the tumor suppressor protein p53, this study reveals its role in cellular immortality. Transfecting p53 into cells grants them immortality and makes them susceptible to ras oncogene-induced transformation.

    Area of Science:

    • Molecular Biology
    • Cell Biology
    • Oncology

    Background:

    • Malignant transformation requires at least two cellular alterations: immortality and transformation.
    • Cellular immortality can be induced by carcinogens or specific oncogenes.
    • The role of the tumor suppressor protein p53, often elevated in transformed cells, remains unclear.

    Purpose of the Study:

    • To investigate the role of the murine p53 protein in cellular transformation.
    • To determine if p53 can induce cellular immortality and susceptibility to oncogenes.

    Main Methods:

    • Cloning complementary DNA sequences encoding murine p53.
    • Transfecting p53 expression constructs into primary cells with finite lifespans.
    • Assessing cellular immortality and susceptibility to ras oncogene transformation.

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    Main Results:

    • Transfection of p53 expression constructs induced cellular immortality in cells with finite lifespans.
    • Cells expressing p53 became susceptible to transformation by a ras oncogene.
    • p53 plays a critical role in overcoming cellular senescence.

    Conclusions:

    • The tumor suppressor protein p53 is a key factor in achieving cellular immortality.
    • p53 cooperates with oncogenes like ras to drive malignant transformation.
    • Understanding p53's function provides insights into cancer development and potential therapeutic targets.