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Two-stage malignant transformation in hamster embryo cells

J A Poiley, R Raineri, R J Pienta

    British Journal of Cancer
    |January 1, 1979
    PubMed
    Summary

    The timing of 12-O-tetradecanoylphorbol-13-acetate (TPA) application critically influences chemical carcinogenesis. Delayed TPA application promotes cell transformation and tumor formation, while early application can inhibit these processes.

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    Area of Science:

    • Cellular and Molecular Biology
    • Chemical Carcinogenesis
    • Cancer Research

    Background:

    • Chemicals like 3-methylcholanthrene (MCA) and dibenz(a,h)anthracene (DBA) are known carcinogens.
    • 12-O-tetradecanoylphorbol-13-acetate (TPA) is a potent promoter in chemical carcinogenesis.
    • Understanding the temporal dynamics of carcinogen and promoter interaction is crucial for cancer research.

    Purpose of the Study:

    • To investigate the role of TPA timing in chemical carcinogenesis of hamster embryo cells.
    • To determine how the interval between carcinogen initiation and TPA promotion affects cell transformation and tumorigenicity.
    • To elucidate the dual role of TPA as a potential inhibitor or promoter.

    Main Methods:

    • Primary hamster embryo cells were treated with carcinogens (MCA, DBA) and the promoter (TPA) at varying time intervals.
    • Cellular transformation was assessed by monitoring abnormal morphology, increased lifespan, and growth in soft agar.
    • Tumorigenic potential was evaluated through subcutaneous inoculation into suckling hamsters.

    Main Results:

    • The latent period for morphological transformation was similar for MCA and MCA+TPA treatments, but tumorigenic potential differed.
    • Delayed TPA administration (27 days post-carcinogen) led to cell transformation and tumor formation.
    • Early TPA administration (7 days post-carcinogen) inhibited tumor formation, even with subthreshold DBA doses.

    Conclusions:

    • TPA's role as an inhibitor or promoter is dependent on the time elapsed between carcinogen initiation and its application.
    • Early TPA exposure can impede the development of transformed cell phenotypes.
    • A sufficient delay between carcinogen and promoter allows for successful cell transformation and enhances the tumorigenic potential of cells initiated with subthreshold carcinogen doses.

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