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    Defective responses of transformed keratinocytes to terminal differentiation stimuli. Their role in epidermal tumour promotion by phorbol esters and by deep skin wounding.

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    Authors
    Parkinson, Eric K
    Affiliation
    Department of Epithelial Kinetics, Paterson Laboratories, Christie Hospital and Holt Radium Institute, Wilslow Road, Manchester M20 9BX, UK.
    Issue Date
    1985-10
    
    Metadata
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    Abstract
    Epidermal tumourigenesis can be achieved in rodents by the application of a single subthreshold dose of a carcinogen (initiation) followed by repeated applications of a tumour promoter such as 12-0-tetradecanoyl phorbol, 13-acetate (TPA). TPA induces terminal differentiation in the majority of epidermal keratinocytes in vitro. However, transformed keratinocytes respond weakly to this terminal differentiation signal, and it is suggested that this property allows initiated cells and their progeny to obtain a selective advantage over their normal counterparts during promotion of papilloma formation by TPA. New data are reviewed which suggest that a putative wound hormone TGF-beta has similar differential effects on normal and transformed epithelial cells to those of TPA. It is proposed that the release of TGF-beta from platelets following deep skin wounding may be an explanation as to why wounding is a promoting stimulus but milder forms of epidermal injury are not. Weakly promoting hyperplasiogenic agents are also discussed within the context of a selection theory of tumour promotion.
    Citation
    Defective responses of transformed keratinocytes to terminal differentiation stimuli. Their role in epidermal tumour promotion by phorbol esters and by deep skin wounding. 1985, 52 (4):479-93 Br J Cancer
    Journal
    British Journal of Cancer
    URI
    http://hdl.handle.net/10541/117110
    PubMed ID
    2415144
    Type
    Article
    Language
    en
    ISSN
    0007-0920
    Collections
    All Paterson Institute for Cancer Research

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