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Microinjected c-myc as a competence factor.

L Kaczmarek, J K Hyland, R Watt

    Science (New York, N.Y.)
    |June 14, 1985
    PubMed
    Summary
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    The c-myc protein acts as an intracellular competence factor, stimulating DNA synthesis in quiescent cells. Unlike platelet-derived growth factor (PDGF), c-myc functions independently of external signaling pathways.

    Area of Science:

    • Cell Biology
    • Molecular Oncology
    • Cell Cycle Regulation

    Background:

    • Oncogenes are often expressed in a cell cycle-dependent manner, but their precise roles in proliferation control require functional assays.
    • Understanding the mechanisms by which oncogenes influence cell cycle progression is crucial for cancer research.

    Purpose of the Study:

    • To investigate the direct functional role of the c-myc protein in controlling cell proliferation.
    • To compare the mechanism of action of c-myc with that of platelet-derived growth factor (PDGF).

    Main Methods:

    • Microinjection of c-myc protein into quiescent Swiss 3T3 cells.
    • Assessing the stimulation of cellular DNA synthesis.
    • Utilizing antibodies against PDGF and c-myc to determine the localization of their function.

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    Main Results:

    • Microinjected c-myc protein stimulated DNA synthesis in quiescent cells, cooperating with platelet-poor plasma.
    • c-myc protein promoted cell cycle progression to S phase, acting as a competence factor.
    • c-myc-induced DNA synthesis was unaffected by the presence of an anti-c-myc antibody, unlike PDGF-induced synthesis.

    Conclusions:

    • c-myc protein functions as an intracellular competence factor, driving cell proliferation.
    • PDGF acts as an extracellular signaling molecule, whereas c-myc exerts its effects from within the cell.
    • These findings highlight distinct mechanisms of action for oncogenes and growth factors in cell cycle regulation.