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Arend, Rebecca C; Londoño-Joshi, Angelina I; Gangrade, Abhishek; Katre, Ashwini A; Kurpad, Chandrika; Li, Yonghe; Samant, Rajeev S; Li, Pui-Kai; Landen, Charles N; Yang, Eddy S; Hidalgo, Bertha; Alvarez, Ronald D; Straughn, John Michael; Forero, Andres; Buchsbaum, Donald J
Oncotarget, 12/2016, Letnik: 7, Številka: 52Journal Article
Epithelial ovarian cancer (EOC) is the leading cause of gynecologic cancer mortality worldwide. Platinum-based therapy is the standard first line treatment and while most patients initially respond, resistance to chemotherapy usually arises. Major signaling pathways frequently upregulated in chemoresistant cells and important in the maintenance of cancer stem cells (CSCs) include Wnt/β-catenin, mTOR, and STAT3. The major objective of our study was to investigate the treatment of ovarian cancer with targeted agents that inhibit these three pathways. Here we demonstrate that niclosamide, a salicylamide derivative, and two synthetically manufactured niclosamide analogs (analog 11 and 32) caused significant inhibition of proliferation of two chemoresistant ovarian cancer cell lines (A2780cp20 and SKOV3Trip2), tumorspheres isolated from the ascites of EOC patients, and cells from a chemoresistant patient-derived xenograft (PDX). This work shows that all three agents significantly decreased the expression of proteins in the Wnt/β-catenin, mTOR and STAT3 pathways and preferentially targeted cells that expressed the ovarian CSC surface protein CD133. It also illustrates the potential of drug repurposing for chemoresistant EOC and can serve as a basis for pathway-oriented in vivo studies.
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in: SICRIS
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