Oncotarget

Research Papers:

Low-dose salinomycin induces anti-leukemic responses in AML and MLL

Gary D.R. Roulston _, Charlotte L. Burt, Laura M.J. Kettyle, Kyle B. Matchett, Heather L. Keenan, Nuala M. Mulgrew, Joanne M. Ramsey, Caoifa Dougan, John McKiernan, Ivan V. Grishagin, Ken I. Mills and Alexander Thompson

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Oncotarget. 2016; 7:73448-73461. https://doi.org/10.18632/oncotarget.11866

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Abstract

Gary D.R. Roulston1,*, Charlotte L. Burt1,*, Laura M.J. Kettyle1, Kyle B. Matchett1, Heather L. Keenan2, Nuala M. Mulgrew1, Joanne M. Ramsey1, Caoifa Dougan1, John McKiernan1, Ivan V. Grishagin1, Ken I. Mills1, Alexander Thompson1,3

1Centre for Cancer Research and Cell Biology, Queen’s University Belfast, Belfast, BT9 7AE, Northern Ireland, United Kingdom

2Cambridge University School of Clinical Medicine, Addenbrooke’s Hospital, Cambridge, CB2 0SP, United Kingdom

3Division of Cancer and Stem Cells, School of Medicine, Wolfson Centre for Stem Cells, Tissue Engineering & Modelling (STEM), University of Nottingham, Nottingham, NG7 2RD, United Kingdom

*These authors have contributed equally to this work

Correspondence to:

Alexander Thompson, email: [email protected]

Keywords: drug repurposing, salinomycin, anti-leukemia, gene signature, AML/MLL-rearrangements

Received: June 03, 2016    Accepted: August 15, 2016    Published: September 06, 2016

ABSTRACT

Development of anti-cancer drugs towards clinical application is costly and inefficient. Large screens of drugs, efficacious for non-cancer disease, are currently being used to identify candidates for repurposing based on their anti-cancer properties. Here, we show that low-dose salinomycin, a coccidiostat ionophore previously identified in a breast cancer screen, has anti-leukemic efficacy. AML and MLLr cell lines, primary cells and patient samples were sensitive to submicromolar salinomycin. Most strikingly, colony formation of normal hematopoietic cells was unaffected by salinomycin, demonstrating a lack of hemotoxicity at the effective concentrations. Furthermore, salinomycin treatment of primary cells resulted in loss of leukemia repopulation ability following transplantation, as demonstrated by extended recipient survival compared to controls. Bioinformatic analysis of a 17-gene signature identified and validated in primary MLLr cells, uncovered immunomodulatory pathways, hubs and protein interactions as potential transducers of low dose salinomycin treatment. Additionally, increased protein expression of p62/Sqstm1, encoded for by one of the 17 signature genes, demonstrates a role for salinomycin in aggresome/vesicle formation indicative of an autophagic response.

Together, the data support the efficacy of salinomycin as an anti-leukemic at non-hemotoxic concentrations. Further investigation alone or in combination with other therapies is warranted for future clinical trial.


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