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Molecular Cancer
Published in: Molecular Cancer 1/2016

Open Access 01-12-2016 | Research

CCL18 from ascites promotes ovarian cancer cell migration through proline-rich tyrosine kinase 2 signaling

Authors: Denis Lane, Isabelle Matte, Claude Laplante, Perrine Garde-Granger, Alex Carignan, Paul Bessette, Claudine Rancourt, Alain Piché

Published in: Molecular Cancer | Issue 1/2016

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Abstract

Background

Ovarian cancer (OC) ascites consist in a proinflammatory tumor environment that is characterized by the presence of various cytokines, chemokines and growth factors. The presence of these inflammatory-related factors in ascites is associated with a more aggressive tumor phenotype. CCL18 is a member of CCL chemokines and its expression has been associated with poor prognosis in some cancers. However, its role in OC progression has not been established. Therefore, the aim of the current study was to elucidate the role of ascites CCL18 in OC progression.

Methods

ELISA and tissue microarrays were used to assess CCL18 in ascites and phospho-Pyk2 expression in cancer tissues respectively. Cell migration was assessed using Boyden chambers. CCL18 and ascites signaling was examined in ovarian cancer cells utilizing siRNA and exogenous gene expression.

Results

Here, we show that CCL18 levels are markedly increased in advanced serous OC ascites relative to peritoneal effusions from women with benign conditions. Ascites and CCL18 dose-dependently enhanced the migration of OC cell lines CaOV3 and OVCAR3. CCL18 levels in ascites positively correlated with the ability of ascites to promote cell migration. CCL18 blocking antibodies significantly attenuated ascites-induced cell migration. Ascites and CCL18 stimulated the phosphorylation of proline-rich tyrosine kinase 2 (Pyk2) in CaOV3 and OVCAR3 cells. Most importantly, the expression of phosphorylated Pyk2 in serous OC tumors was associated with shorter progression-free survival. Furthermore, enforced expression of Pyk2 promoted tumor cell migration while siRNA-mediated downregulation of Pyk2 attenuated cell migration. Downregulation of Pyk2 markedly inhibited ascites and CCL18-induced cell migration.

Conclusions

Taken together, our findings establish an important role for CCL18, as a component of ascites, in the migration of tumor cells and identify Pyk2 as prognostic factor and a critical downstream signaling pathway for ascites-induced OC cell migration.
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Metadata
Title
CCL18 from ascites promotes ovarian cancer cell migration through proline-rich tyrosine kinase 2 signaling
Authors
Denis Lane
Isabelle Matte
Claude Laplante
Perrine Garde-Granger
Alex Carignan
Paul Bessette
Claudine Rancourt
Alain Piché
Publication date
01-12-2016
Publisher
BioMed Central
Published in
Molecular Cancer / Issue 1/2016
Electronic ISSN: 1476-4598
DOI
https://doi.org/10.1186/s12943-016-0542-2

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