title: Sphingosine kinase 1 as a potential therapeutic target in epithelial ovarian cancer.
abstract: 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.
authors.affiliation: Department of Obstetrics and Gynecology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
authors.forename: Jeong-Won
authors.initials: JW
authors.lastname: Lee
authors.forename: Ji-Yoon
authors.initials: JY
authors.lastname: Ryu
authors.forename: Gun
authors.initials: G
authors.lastname: Yoon
authors.forename: Hye-Kyung
authors.initials: HK
authors.lastname: Jeon
authors.forename: Young-Jae
authors.initials: YJ
authors.lastname: Cho
authors.forename: Jung-Joo
authors.initials: JJ
authors.lastname: Choi
authors.forename: Sang Yong
authors.initials: SY
authors.lastname: Song
authors.forename: In-Gu
authors.initials: IG
authors.lastname: Do
authors.forename: Yoo-Young
authors.initials: YY
authors.lastname: Lee
authors.forename: Tae-Joong
authors.initials: TJ
authors.lastname: Kim
authors.forename: Chel Hun
authors.initials: CH
authors.lastname: Choi
authors.forename: Byoung-Gie
authors.initials: BG
authors.lastname: Kim
authors.forename: Duk-Soo
authors.initials: DS
authors.lastname: Bae
mesh_terms: D018262:Adenocarcinoma, Clear Cell / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D000818:Animals; D000077216:Carcinoma, Ovarian Epithelial; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D005260:Female; D000068876:Fingolimod Hydrochloride; D006801:Humans; D007166:Immunosuppressive Agents / Q000008:administration & dosage* / Q000494:pharmacology; D051379:Mice; D008819:Mice, Nude; D009368:Neoplasm Transplantation; D009375:Neoplasms, Glandular and Epithelial / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D010051:Ovarian Neoplasms / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D017853:Phosphotransferases (Alcohol Group Acceptor) / Q000037:antagonists & inhibitors* / Q000378:metabolism; D011409:Propylene Glycols / Q000008:administration & dosage* / Q000494:pharmacology; D047428:Protein Kinase Inhibitors / Q000008:administration & dosage* / Q000494:pharmacology; D034741:RNA, Small Interfering; D013110:Sphingosine / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000494:pharmacology; D023041:Xenograft Model Antitumor Assays; D000099157:Sphingosine Kinase
chemical_list: D000068876:Fingolimod Hydrochloride; D007166:Immunosuppressive Agents; D017853:Phosphotransferases (Alcohol Group Acceptor); D011409:Propylene Glycols; D047428:Protein Kinase Inhibitors; D034741:RNA, Small Interfering; D013110:Sphingosine; D000099157:Sphingosine Kinase
keywords: epithelial ovarian cancer; sphingosine kinase 1; targeted therapy; therapeutic target