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Tumor Biology

, Volume 37, Issue 7, pp 9825–9835 | Cite as

Combined niclosamide with cisplatin inhibits epithelial-mesenchymal transition and tumor growth in cisplatin-resistant triple-negative breast cancer

  • Junjun Liu
  • Xiaosong Chen
  • Toby Ward
  • Mark Pegram
  • Kunwei Shen
Original Article

Abstract

Women with triple-negative breast cancer have worse prognosis compared to other breast cancer subtypes. Acquired drug resistance remains to be an important reason influencing triple-negative breast cancer treatment efficacy. A prevailing theory postulates that the cancer resistance and recurrence results from a subpopulation of tumor cells with stemness program, which are often insensitive to cytotoxic drugs such as cisplatin. Recent studies suggested that niclosamide, an anti-helminthic drug, has potential therapeutic activities against breast cancer stem cells, which prompts us to determine its roles on eliminating cisplatin-resistant cancer cells. Hence, we established a stable cisplatin-resistant MDA-MB-231 cell line (231-CR) through continuously exposure to increasing concentrations of cisplatin (5–20 μmol/l). Interestingly, 231-CR exhibited properties associated to epithelial-mesenchymal transition with enhanced invasion, preserved proliferation, increased mammosphere formation, and reduced apoptosis compared to naive MDA-MB-231 sensitive cells (231-CS). Importantly, niclosamide or combination with cisplatin inhibited both 231-CS and 231-CR cell proliferation in vitro. In addition, niclosamide reversed the EMT phenotype of 231-CR by downregulation of snail and vimentin. Mechanistically, niclosamide treatment in combination with or without cisplatin significantly inhibited Akt, ERK, and Src signaling pathways. In vivo study showed that niclosamide or combination with cisplatin could repress the growth of xenografts originated from either 231-CS or 231-CR cells, with prominent suppression of Ki67 expression. These findings suggested that niclosamide might serve as a novel therapeutic strategy, either alone or in combination with cisplatin, for triple-negative breast cancer treatment, especially those resistant to cisplatin.

Keywords

Triple-negative breast cancer Cisplatin resistance Epithelial-mesenchymal transition Niclosamide 

Notes

Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant Number: 81172520) and the Technology Innovation Act Plan of the Shanghai Municipal Science and Technology Commission (Grant Numbers: 14411950200 and 14411950201).

Compliance with ethical standards

All experimental xenograft procedures were carried out in compliance with the institutional requirements and approved by the Shanghai Jiao Tong University School of Medicine Committee for the Use and Care of Animals.

Conflicts of interest

M. Pegram served as a consultant advisory board member for Roche/Genentech, Inc. Other authors declare that they have no conflicts of interest in the studies described.

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Copyright information

© International Society of Oncology and BioMarkers (ISOBM) 2015

Authors and Affiliations

  1. 1.Comprehensive Breast Health Center, Ruijin HospitalShanghai Jiaotong Univerisity School of MedicineShanghaiChina
  2. 2.Stanford Cancer InstituteStanford University School of MedicineStanfordUSA

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