A genome‐wide RNAi screen reveals essential therapeutic targets of breast cancer stem cells

A genome‐wide RNAi screen reveals essential therapeutic targets of breast cancer stem cells

Abstract Therapeutic resistance is a major clinical challenge in oncology. Evidence identifies cancer stem cells (CSCs) as a driver of tumor evolution. Accordingly, the key stemness property unique to CSCs may represent a reservoir of therapeutic target to improve cancer treatment. Here, we carried...

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Main Authors: Abir Arfaoui, Claire Rioualen, Violette Azzoni, Guillaume Pinna, Pascal Finetti, Julien Wicinski, Emmanuelle Josselin, Manon Macario, Rémy Castellano, Candi Léonard‐Stumpf, Anthony Bal, Abigaelle Gros, Sylvain Lossy, Maher Kharrat, Yves Collette, Francois Bertucci, Daniel Birnbaum, Hayet Douik, Ghislain Bidaut, Emmanuelle Charafe‐Jauffret, Christophe Ginestier
Format: Article
Language:English
Published: Springer Nature 2019-09-01
Series:EMBO Molecular Medicine
Subjects:
breast cancer
cancer stem cells
JQ1
RNAi screen
salinomycin
Online Access:https://doi.org/10.15252/emmm.201809930
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Summary:Abstract Therapeutic resistance is a major clinical challenge in oncology. Evidence identifies cancer stem cells (CSCs) as a driver of tumor evolution. Accordingly, the key stemness property unique to CSCs may represent a reservoir of therapeutic target to improve cancer treatment. Here, we carried out a genome‐wide RNA interference screen to identify genes that regulate breast CSCs‐fate (bCSC). Using an interactome/regulome analysis, we integrated screen results in a functional mapping of the CSC‐related processes. This network analysis uncovered potential therapeutic targets controlling bCSC‐fate. We tested a panel of 15 compounds targeting these regulators. We showed that mifepristone, salinomycin, and JQ1 represent the best anti‐bCSC activity. A combination assay revealed a synergistic interaction of salinomycin/JQ1 association to deplete the bCSC population. Treatment of primary breast cancer xenografts with this combination reduced the tumor‐initiating cell population and limited metastatic development. The clinical relevance of our findings was reinforced by an association between the expression of the bCSC‐related networks and patient prognosis. Targeting bCSCs with salinomycin/JQ1 combination provides the basis for a new therapeutic approach in the treatment of breast cancer.
ISSN:1757-4676
1757-4684

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