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Nuclear beta-catenin accumulation associates with epithelial morphogenesis in craniopharyngiomas

Buslei, Rolf, Hoelsken, Annett, Hofmann, Bernd, Kreutzer, Juergen, Siebzehnrubl, Florian ORCID:, Hans, Volkmar, Oppel, Falk, Buchfelder, Michael, Fahlbusch, Rudolf and Bluemcke, Ingmar 2007. Nuclear beta-catenin accumulation associates with epithelial morphogenesis in craniopharyngiomas. Acta Neuropathologica 113 (5) , pp. 585-590.

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Activation of the Wnt/wingless signalling cascade is a key mechanism in developmental morphogenesis, whereas aberrant nuclear accumulation of β-catenin in adult tissues seems to be associated with neoplastic transformation and tumour progression. Adamantinomatous craniopharyngiomas carry activating mutations in exon 3 of the β-catenin gene, which results in a distinct pattern of nuclear β-catenin accumulation in up to 95% of respective tumour specimens. To better characterise the impact of nuclear β-catenin aggregation in these neoplasms, we systematically examined epithelial differentiation and cell cycle-associated molecules in accumulating compared to non-accumulating tumour cell clusters using a cohort of 65 adamantinomatous craniopharyngiomas. Monoclonal antibodies directed against cytokeratins 5/6 (CK5/6) were utilised to differentiate squamous from simple epithelium, the latter being identified by immunoreactivity for cytokeratins 8 and 18 (CK8/CK18). Intriguingly, nuclear β-catenin accumulation in whorl-like tumour cell clusters was always associated with a distinct CK8 and CK18 immunoreactivity, whereas surrounding non-accumulating tumour cells showed exclusively squamous differentiation indicated by CK5/6 expression. In addition, a low proliferation activity combined with an increased expression of p21WAF1/CIP1, a key control protein of the cell cycle, was observed in β-catenin accumulating cells. Our data support an impact of nuclear β-catenin on different cytoarchitectural and epithelial differentiation patterns in adamantinomatous craniopharyngiomas.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
European Cancer Stem Cell Research Institute (ECSCRI)
Publisher: Springer Verlag
ISSN: 0001-6322
Last Modified: 25 Oct 2022 10:12

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