title: Salinomycin Promotes Anoikis and Decreases the CD44+/CD24- Stem-Like Population via Inhibition of STAT3 Activation in MDA-MB-231 Cells.
abstract: Triple-negative breast cancer (TNBC) is an aggressive tumor subtype with an enriched CD44+/CD24- stem-like population. Salinomycin is an antibiotic that has been shown to target cancer stem cells (CSC); however, the mechanisms of action involved have not been well characterized. The objective of the present study was to investigate the effect of salinomycin on cell death, migration, and invasion, as well as CSC-like properties in MDA-MB-231 breast cancer cells. Salinomycin significantly induced anoikis-sensitivity, accompanied by caspase-3 and caspase-8 activation and PARP cleavage, during anchorage-independent growth. Salinomycin treatment also caused a marked suppression of cell migration and invasion with concomitant downregulation of MMP-9 and MMP-2 mRNA levels. Notably, salinomycin inhibited the formation of mammospheres and effectively reduced the CD44+/CD24- stem-like population during anchorage-independent growth. These observations were associated with the inhibition of STAT3 phosphorylation (Tyr705). Furthermore, interleukin-6 (IL-6)-induced STAT3 activation was strongly suppressed by salinomycin challenge. These findings support the notion that salinomycin may be potentially efficacious for targeting breast cancer stem-like cells through the inhibition of STAT3 activation.
authors.affiliation: Division of Medical Oncology, Department of Internal Medicine, Korea University College of Medicine, Korea University, Seoul 152-703, Republic of Korea; Brain Korea 21 Program for Biomedicine Science, Korea University College of Medicine, Korea University, Seoul 152-703, Republic of Korea.
authors.forename: Hyunsook
authors.initials: H
authors.lastname: An
authors.affiliation: Division of Medical Oncology, Department of Internal Medicine, Korea University College of Medicine, Korea University, Seoul 152-703, Republic of Korea; Brain Korea 21 Program for Biomedicine Science, Korea University College of Medicine, Korea University, Seoul 152-703, Republic of Korea.
authors.forename: Ji Young
authors.initials: JY
authors.lastname: Kim
authors.affiliation: Division of Medical Oncology, Department of Internal Medicine, Korea University College of Medicine, Korea University, Seoul 152-703, Republic of Korea; Brain Korea 21 Program for Biomedicine Science, Korea University College of Medicine, Korea University, Seoul 152-703, Republic of Korea.
authors.forename: Eunhye
authors.initials: E
authors.lastname: Oh
authors.affiliation: Division of Medical Oncology, Department of Internal Medicine, Korea University College of Medicine, Korea University, Seoul 152-703, Republic of Korea; Brain Korea 21 Program for Biomedicine Science, Korea University College of Medicine, Korea University, Seoul 152-703, Republic of Korea.
authors.forename: Nahyun
authors.initials: N
authors.lastname: Lee
authors.affiliation: Division of Medical Oncology, Department of Internal Medicine, Korea University College of Medicine, Korea University, Seoul 152-703, Republic of Korea; Brain Korea 21 Program for Biomedicine Science, Korea University College of Medicine, Korea University, Seoul 152-703, Republic of Korea.
authors.forename: Youngkwan
authors.initials: Y
authors.lastname: Cho
authors.affiliation: Division of Medical Oncology, Department of Internal Medicine, Korea University College of Medicine, Korea University, Seoul 152-703, Republic of Korea; Brain Korea 21 Program for Biomedicine Science, Korea University College of Medicine, Korea University, Seoul 152-703, Republic of Korea.
authors.forename: Jae Hong
authors.initials: JH
authors.lastname: Seo
mesh_terms: D023102:Anoikis; D001943:Breast Neoplasms / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D045744:Cell Line, Tumor; D006801:Humans; D018960:Hyaluronan Receptors; D015850:Interleukin-6 / Q000235:genetics / Q000378:metabolism; D008297:Male; D020778:Matrix Metalloproteinase 2 / Q000096:biosynthesis / Q000235:genetics; D020780:Matrix Metalloproteinase 9 / Q000096:biosynthesis / Q000235:genetics; D009363:Neoplasm Proteins / Q000235:genetics / Q000378:metabolism*; D014411:Neoplastic Stem Cells / Q000378:metabolism* / Q000473:pathology; D011714:Pyrans / Q000494:pharmacology*; D050796:STAT3 Transcription Factor / Q000235:genetics / Q000378:metabolism*; D051918:Sialic Acid Binding Ig-like Lectin 2; D000095662:Polyether Polyketides
chemical_list: D018960:Hyaluronan Receptors; D015850:Interleukin-6; D020778:Matrix Metalloproteinase 2; D020780:Matrix Metalloproteinase 9; D009363:Neoplasm Proteins; D011714:Pyrans; D050796:STAT3 Transcription Factor; D051918:Sialic Acid Binding Ig-like Lectin 2; C508600:IL6 protein, human; C494086:STAT3 protein, human; C010327:salinomycin; D000095662:Polyether Polyketides; C522361:MMP2 protein, human; C579270:MMP9 protein, human