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Cell Growth & Differentiation, Vol 7, Issue 5 679-687, Copyright © 1996 by American Association of Cancer Research


ARTICLES

Altered epidermal cell growth control in vivo by inducible expression of transforming growth factor beta 1 in the skin of transgenic mice

DJ Fowlis, W Cui, SA Johnson, A Balmain and RJ Akhurst
Department of Medical Genetics, Glasgow University, Yorkhill, United Kingdom.

An inducible bovine KIV* keratin gene promoter was used to target expression of latent or activated transforming growth factor beta 1 (TGF beta 1) to keratinocytes in transgenic mice. This short (2.2-kb) keratin 6 (K6) promoter element was generally silent in untreated animals but was induced in keratinocytes when placed in culture or, in vivo, in response to hyperplasia that follows topical application of the tumor promoter, 12-O-tetradecanoylphorbol-13-acetate. All of the K6-TGF beta 1 transgenic lines studied showed attenuation of the basal keratinocyte proliferative response to 12-O-tetradecanoylphorbol-13-acetate as a consequence of inducible TGF beta 1 gene expression. One of the six lines studied showed constitutive transgene expression at low levels in the skin, and this line had a 2- to 3-fold increase in epidermal DNA labeling index over control mice. Although in vitro TGF beta 1 is known to be a potent negative regulator of epithelial cell proliferation, in vivo TGF beta 1 has complex biological activities and can act as either a positive or negative regulator of keratinocyte proliferation.


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HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Cancer Research Clinical Cancer Research
Cancer Epidemiology Biomarkers & Prevention Molecular Cancer Therapeutics
Molecular Cancer Research Cell Growth & Differentiation
Copyright © 1996 by the American Association of Cancer Research.