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- W2105241867 abstract "Tumor formation involves epigenetic modifications and microenvironmental changes as well as cumulative genetic alterations encompassing somatic mutations, loss of heterozygosity, and aneuploidy. Here, we show that conditional targeting of p120 catenin in mice leads to progressive development of skin neoplasias associated with intrinsic NF-kappaB activation. We find that, similarly, squamous cell carcinomas in humans display altered p120 and activated NF-kappaB. We show that epidermal hyperproliferation arising from p120 loss can be abrogated by IkappaB kinase 2 inhibitors. Although this underscores the importance of this pathway, the role of NF-kappaB in hyperproliferation appears rooted in its impact on epidermal microenvironment because as p120-null keratinocytes display a growth-arrested phenotype in culture. We trace this to a mitotic defect, resulting in unstable, binucleated cells in vitro and in vivo. We show that the abnormal mitoses can be ameliorated by inhibiting RhoA, the activity of which is abnormally high. Conversely, we can elicit such mitotic defects in control keratinocytes by elevating RhoA activity. The ability of p120 deficiency to elicit mitotic alterations and chronic inflammatory responses, that together may facilitate the development of genetic instability in vivo, provides insights into why it figures so prominently in skin cancer progression." @default.
- W2105241867 created "2016-06-24" @default.
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- W2105241867 date "2008-10-07" @default.
- W2105241867 modified "2023-10-17" @default.
- W2105241867 title "Loss of p120 catenin and links to mitotic alterations, inflammation, and skin cancer" @default.
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- W2105241867 doi "https://doi.org/10.1073/pnas.0807301105" @default.
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