Open AccessSilencing dishevelled‐1 sensitizes paclitaxel‐resistant human ovarian cancer cells via AKT/GSK‐3β/β‐catenin signalling
Author(s) -
Zhang Kun,
Song Haixing,
Yang Ping,
Dai Xiaozhen,
Li Ya,
Wang Lan,
Du Jun,
Pan Kejian,
Zhang Tao
Publication year - 2015
Publication title -
cell proliferation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.647
H-Index - 74
eISSN - 1365-2184
pISSN - 0960-7722
DOI - 10.1111/cpr.12161
Subject(s) - dishevelled , protein kinase b , paclitaxel , gene silencing , pi3k/akt/mtor pathway , cancer research , chemistry , ovarian cancer , cancer cell , phosphorylation , biology , signal transduction , microbiology and biotechnology , cancer , medicine , wnt signaling pathway , biochemistry , frizzled , gene
Abstract Objectives Expression of dishevelled‐1 (DVL1) has recently been linked to cancer progression, however, its role in resistance to cancer therapy is unclear. In this study, we aimed to explore the function of DVL1 in paclitaxel‐resistant human ovarian cancer cells. Materials and methods The MTT assay was used to assess effects of DVL1 silencing on sensitivity of cells that were otherwise resistant to paclitaxel (Taxol). Western blotting and immunofluorescence staining were used to examine effects of DVL1 on AKT/GSK‐3β/β‐catenin signalling. Results Dishevelled‐1 was found to be over‐expressed in a paclitaxel‐resistant cell line derived from human ovarian cancer cell line A2780 (A2780/Taxol line) as well as parental A2780 cells. Down‐regulation of DVL1 (using the inhibitor 3289‐8625 or siRNA (siDVL1) against DVL1) sensitized A2780/Taxol cells to paclitaxel. Over‐expression of DVL1 in A2780 cells increased protein levels of P‐gp, BCRP and Bcl‐2, which are known targets of β‐catenin. Silencing DVL1 in A2780/Taxol cells also reduced levels of these proteins, and led to accumulation of β‐catenin. In addition, DVL1 aberrantly activated AKT/GSK‐3β/β‐catenin signalling. Inactivation of AKT signalling attenuated DVL1‐mediated inhibition of GSK‐3β and accumulation of β‐catenin, in both A2780 and A2780/Taxol cells. Conclusions Taken together, these results suggest that silencing DVL1 sensitized A2780/Taxol cells to paclitaxel, by down‐regulating AKT/GSK‐3β/β‐catenin signalling, providing a novel strategy for chemosensitization of ovarian cancer to paclitaxel‐induced cytotoxicity.