Downregulation of cell surface CA125/MUC16 induces epithelial-to-mesenchymal transition and restores EGFR signalling in NIH:OVCAR3 ovarian carcinoma cells.

Abstract:

BACKGROUND:Epithelial ovarian cancer (EOC) cells are prone to metastasise throughout the peritoneal cavity. The epithelial-to-mesenchymal transition (EMT) is a necessary step towards metastatic tumour progression. CA125/MUC16 mucin is a high-molecular-weight glycoprotein overexpressed in the majority of serous carcinomas, suggesting a possible role in the pathogenesis of these cancers. METHODS:The role of CA125/MUC16 in EMT was investigated using single-chain antibody-mediated knockdown of cell surface CA125/MUC16 in overexpressing EOC NIH:OVCAR3 cells. RESULTS:CA125/MUC16 knockdown was associated with morphological alterations along with decreased surface expression of epithelial markers (E-cadherin, cytokeratin-18) and increased expression of mesenchymal markers (N-cadherin, vimentin). Co-immunoprecipitation experiments revealed that CA125/MUC16 binds to E-cadherin and β-catenin complexes. The in vitro studies showed disruption of cell-cell junctions, enhanced motility, migration and invasiveness in CA125/MUC16 knockdown cells. Enhanced epidermal growth factor receptor (EGFR) activation was observed in CA125/MUC16 knockdown cells along with increased Akt and ERK1/2 phosphorylation, which are downstream effectors of EGFR, and increased MMP-2 and MMP-9 expression and activities. Epidermal growth factor receptor inhibition strongly inhibited the motility of CA125/MUC16 knockdown cells. CONCLUSIONS:Our findings suggest that CA125/MUC16 plays a role in EMT, presumably through its interaction with E-cadherin and β-catenin complexes and by modulating EGFR and its downstream signalling pathway in NIH:OVCAR3 cells.

journal_name

Br J Cancer

authors

Comamala M,Pinard M,Thériault C,Matte I,Albert A,Boivin M,Beaudin J,Piché A,Rancourt C

doi

10.1038/bjc.2011.34

subject

Has Abstract

pub_date

2011-03-15 00:00:00

pages

989-99

issue

6

eissn

0007-0920

issn

1532-1827

pii

bjc201134

journal_volume

104

pub_type

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