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Sphingosine kinase 1 as a potential therapeutic target in epithelial ovarian cancer
Author(s) -
Lee JeongWon,
Ryu JiYoon,
Yoon Gun,
Jeon HyeKyung,
Cho YoungJae,
Choi JungJoo,
Song Sang Yong,
Do InGu,
Lee YooYoung,
Kim TaeJoong,
Choi Chel Hun,
Kim ByoungGie,
Bae DukSoo
Publication year - 2014
Publication title -
international journal of cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.475
H-Index - 234
eISSN - 1097-0215
pISSN - 0020-7136
DOI - 10.1002/ijc.29362
Subject(s) - sphingosine kinase 1 , angiogenesis , sphingosine , cancer research , cell growth , in vivo , apoptosis , cell culture , ovarian cancer , ovarian carcinoma , biology , medicine , chemistry , cancer , sphingosine 1 phosphate , biochemistry , receptor , genetics , microbiology and biotechnology
Sphingosine kinase 1 (SK1) is over‐expressed in multiple types of human cancer. SK1 has growth‐promoting effects and has been proposed as a potential therapeutic target. We investigated the therapeutic effects of SK1 inhibition in epithelial ovarian carcinoma (EOC). SK1 siRNA or inhibitors were tested in EOC cell lines, including A2780, SKOV3ip1, A2780‐CP20, SKOV3‐TR, ES2 and RMG2. Cells were treated with SK inhibitor or FTY720, and cell proliferation, apoptosis, angiogenesis and invasion were examined by MTT, FACS, ELISA and wound‐healing assays, respectively. In vivo experiments were performed to test the effects of FTY720 on tumor growth in orthotopic mouse xenografts of EOC cell lines A2780 or SKOV3ip1 and a patient‐derived xenograft (PDX) model of clear cell ovarian carcinoma (CCC). Blocking SK1 with siRNA or inhibitors significantly reduced proliferation, angiogenesis and invasion, and increased apoptosis in chemosensitive (A2780 and SKOV3ip1) and chemoresistant (A2780‐CP20, SKOV3‐TR, ES2 and RMG2) EOC cells. SK1 inhibitors also decreased the intracellular enzymatic activity of SK1. Furthermore, FTY720 treatment significantly decreased the in vivo tumor weight in xenograft models of established cell lines (A2780 and SKOV3ip1) and a PDX model for CCC compared to control ( p < 0.05). These results support therapeutic targeting of SK1 as a potential new strategy for EOC.