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TNF-α regulates epithelial expression of MMP-9 and integrin αvβ6 during tumour promotion. A role for TNF-α in keratinocyte migration?

Abstract

Mice deficient in TNF-α (TNF-α−/− mice) are resistant to skin carcinogenesis and expression of MMP-9 is inhibited in TNF-α−/− mice during skin tumour development. In the early stages of tumour promotion, MMP-9 protein initially localized to the follicular epidermis but subsequently began to accumulate in the interfollicular epidermis of wild-type but not TNF-α−/− mice. Inhibition of TNF-α or MMP-9 function reduced keratinocyte migration in vitro. In addition, a deficiency of TNF-α delayed re-epithelialization in vivo and this correlated with reduced MMP-9 expression. Collectively, these data suggest that MMP-9 regulates keratinocyte migration in a TNF-α-dependent manner. Expression profiling of genes that control cell adhesion and migration revealed markedly lower levels of the integrin subunits αv and β6 in TNF-α−/− compared with wild-type keratinocytes in vitro. αvβ6 expression was upregulated by keratinocytes in vitro and during tumour promotion in vivo in a TNF-α-dependent manner. Furthermore, αvβ6 blockade significantly inhibited keratinocyte migration and TNF-α-stimulated MMP-9 expression in vitro. These data illustrate a novel TNF-α-dependent mechanism for the control of αvβ6 expression and suggest one pathway for TNF-α regulation of MMP-9. Increased MMP-9 and αvβ6 expression may stimulate epithelial cell migration during tumour formation and may be one mechanism whereby TNF-α acts as an endogenous tumour promoter.

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Acknowledgements

We are grateful to George Elia for histological processing of the skin samples; Nick East for technical assistance; David Owens for several helpful discussions; Caroline Barton, Frances Burke, Lisa Coussens, Kairbaan Hodivala-Dilke and Marian Nakada for critically reviewing this manuscript; Centocor and Cancer Research UK for funding this research.

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Correspondence to Kate A Scott.

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Scott, K., Arnott, C., Robinson, S. et al. TNF-α regulates epithelial expression of MMP-9 and integrin αvβ6 during tumour promotion. A role for TNF-α in keratinocyte migration?. Oncogene 23, 6954–6966 (2004). https://doi.org/10.1038/sj.onc.1207915

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