Salinomycin overcomes acquired tamoxifen resistance through AIB 1 and inhibits cancer cell invasion in endocrine resistant breast cancer

Summary Salinomycin is a monocarboxylic polyether ionophore isolated from Streptomyces albus . It has been widely used as an antibiotic in veterinary medicine in poultry. A recent study demonstrated that salinomycin selectively inhibits human breast cancer stem cells; one possible mechanism of tamox...

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Published inClinical and experimental pharmacology & physiology Vol. 44; no. 10; pp. 1042 - 1052
Main Authors Manmuan, Suwisit, Sakunrangsit, Nithidol, Ketchart, Wannarasmi
Format Journal Article
LanguageEnglish
Published 01.10.2017
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Abstract Summary Salinomycin is a monocarboxylic polyether ionophore isolated from Streptomyces albus . It has been widely used as an antibiotic in veterinary medicine in poultry. A recent study demonstrated that salinomycin selectively inhibits human breast cancer stem cells; one possible mechanism of tamoxifen resistance. Our results show that salinomycin is effective in inhibiting MCF ‐7/ LCC 2 and MCF ‐7/ LCC 9 cell lines which are well‐established endocrine resistant cells and has a synergistic effect in combination with tamoxifen using MTT proliferation assay. The inhibitory effect of salinomycin on the reduction of critical ER co‐activator; amplified breast 1 ( AIB 1 ) mRNA and protein expression is overcoming tamoxifen resistance . Moreover, salinomycin significantly inhibits cell invasion in Matrigel invasion assay. The effect was mediated at least in part by the decrease of matrix metalopeptidase 9 ( MMP ‐9) which is one critical enzyme facilitated in the cell invasion process. In conclusion, salinomycin should be developed as a novel agent used alone or in combination for endocrine‐resistant breast cancer.
AbstractList Summary Salinomycin is a monocarboxylic polyether ionophore isolated from Streptomyces albus . It has been widely used as an antibiotic in veterinary medicine in poultry. A recent study demonstrated that salinomycin selectively inhibits human breast cancer stem cells; one possible mechanism of tamoxifen resistance. Our results show that salinomycin is effective in inhibiting MCF ‐7/ LCC 2 and MCF ‐7/ LCC 9 cell lines which are well‐established endocrine resistant cells and has a synergistic effect in combination with tamoxifen using MTT proliferation assay. The inhibitory effect of salinomycin on the reduction of critical ER co‐activator; amplified breast 1 ( AIB 1 ) mRNA and protein expression is overcoming tamoxifen resistance . Moreover, salinomycin significantly inhibits cell invasion in Matrigel invasion assay. The effect was mediated at least in part by the decrease of matrix metalopeptidase 9 ( MMP ‐9) which is one critical enzyme facilitated in the cell invasion process. In conclusion, salinomycin should be developed as a novel agent used alone or in combination for endocrine‐resistant breast cancer.
Author Ketchart, Wannarasmi
Manmuan, Suwisit
Sakunrangsit, Nithidol
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