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Wnt pathway activation in mesothelioma: evidence of Dishevelled overexpression and transcriptional activity of beta-catenin.

Abstract：

:Malignant pleural mesothelioma is a relatively uncommon and yet incurable tumor. The pathogenesis of mesothelioma remains poorly understood. This study evaluated the role of Wnt signaling in mesothelioma. Western blot analysis was conducted to confirm the expression of Dishevelled (Dvl) and cytosolic beta-catenin in matched autologous tissue samples (tumor and normal pleura), malignant pleural effusions, and in established mesothelioma cell lines LRK1A, REN and H513. Thirteen of 15 mesotheliomas examined showed consistent overexpression of Dvl and increased cytosolic beta-catenin levels as compared with controls. To evaluate T-cell factor (Tcf)-dependent transcriptional activity of beta-catenin, luciferase assays were conducted. Fresh mesothelioma cells (effusion derived), as well as LRK1A, REN, and H513 cell lines showed a significant fold increase (1.5-2.4-fold, P < 0.01) in Tcf-dependent transcriptional activity of beta-catenin. To evaluate the biological significance of Dvl function in mesothelioma, a PDZ domain deletion mutant (DeltaPDZ-Dvl) was created and stably transfected into LRK1A, REN, and H513. The effect of DeltaPDZ-Dvl on mesothelioma growth was assayed in vitro (colony formation assay in soft agar) and in vivo (s.c. implantation in athymic mice NCRNU-M). In mesothelioma cells tested, DeltaPDZ-Dvl-mediated inhibition of Dvl decreased cytosolic beta-catenin levels, diminished Tcf-mediated transcription, and suppressed tumorigenesis of LRK1A and REN in vitro and in vivo. DeltaPDZ-Dvl also down-regulated expression of c-myc in REN and COX-2 in H513. Our data suggest that in malignant pleural mesothelioma, Wnt signaling is activated through Dvl overexpression and downstream signaling through beta-catenin. Inhibition of this signaling leads to significant antitumor effects. These results demonstrate Dvl overexpression in human cancer and, specifically, that Wnt signaling plays a role in mesothelioma pathogenesis. These data offer possible new avenues for therapeutic intervention.

journal_name

Cancer Res

journal_title

Cancer research

authors

Uematsu K,Kanazawa S,You L,He B,Xu Z,Li K,Peterlin BM,McCormick F,Jablons DM

subject

Has Abstract

pub_date

2003-08-01 00:00:00

pages

4547-51

issue

15

eissn

0008-5472

issn

1538-7445

journal_volume

63

pub_type

杂志文章

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