title: MiR-21 regulates epithelial-mesenchymal transition phenotype and hypoxia-inducible factor-1α expression in third-sphere forming breast cancer stem cell-like cells.
abstract: Cancer stem cells (CSCs) are predicted to be critical drivers of tumor progression due to their "stemness", but the molecular mechanism of CSCs in regulating metastasis remains to be elucidated. Epithelial-mesenchymal transition (EMT), hypoxia-inducible factor (HIF)-1α, and miR-21, all of which contribute to cell migration for metastasis, are interrelated with CSCs. In the present study, third-sphere forming (3-S) CSC-like cells, which showed elevated CSC surface markers (ALDH1(+) and CD44(+)/CD24(-/low)) and sphereforming capacity as well as migration and invasion capacities, were cultured and isolated from breast cancer MCF-7 parental cells, to evaluate the role of miR-21 in regulating the CSC-like cell biological features, especially EMT. EMT, which was assessed by overexpression of mesenchymal cell markers (N-cadherin, Vimentin, alpha-smooth muscle actin [α-SMA]) and suppression of epithelial cell marker (E-cadherin), was induced in 3-S CSC-like cells. Moreover, both of HIF-1α and miR-21 were upregulated in the CSC-like cells. Interestingly, antagonism of miR-21 by antagomir led to reversal of EMT, downexpression of HIF-1α, as well as suppression of invasion and migration, which indicates a key role of miR-21 involved in regulate CSC-associated features. In conclusion, we demonstrated that the formation of CSC-like cells undergoing process of EMT-like associated with overexpression of HIF-1α, both of which are regulated by miR-21.
authors.affiliation: Department of General Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China.
authors.forename: Mingli
authors.initials: M
authors.lastname: Han
authors.forename: Yimeng
authors.initials: Y
authors.lastname: Wang
authors.forename: Manran
authors.initials: M
authors.lastname: Liu
authors.forename: Xiaokai
authors.initials: X
authors.lastname: Bi
authors.forename: Junjie
authors.initials: J
authors.lastname: Bao
authors.forename: Ni
authors.initials: N
authors.lastname: Zeng
authors.forename: Zhikun
authors.initials: Z
authors.lastname: Zhu
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Mo
authors.forename: Chengyi
authors.initials: C
authors.lastname: Wu
authors.forename: Xin
authors.initials: X
authors.lastname: Chen
mesh_terms: D000199:Actins / Q000096:biosynthesis; D000080924:Aldehyde Dehydrogenase 1 Family; D000070416:Antagomirs; D001943:Breast Neoplasms / Q000378:metabolism* / Q000473:pathology; D051927:CD24 Antigen / Q000096:biosynthesis; D015820:Cadherins / Q000037:antagonists & inhibitors / Q000096:biosynthesis; D045744:Cell Line, Tumor; D002465:Cell Movement; D058750:Epithelial-Mesenchymal Transition; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D018960:Hyaluronan Receptors / Q000096:biosynthesis; D051795:Hypoxia-Inducible Factor 1, alpha Subunit / Q000096:biosynthesis*; D007527:Isoenzymes / Q000096:biosynthesis; D035683:MicroRNAs / Q000037:antagonists & inhibitors / Q000378:metabolism*; D009361:Neoplasm Invasiveness; D014411:Neoplastic Stem Cells / Q000378:metabolism* / Q000473:pathology; D009841:Oligonucleotides / Q000494:pharmacology; D050697:Retinal Dehydrogenase / Q000096:biosynthesis; D018874:Spheroids, Cellular / Q000378:metabolism; D014746:Vimentin / Q000096:biosynthesis
chemical_list: C541116:ACTA2 protein, human; D000199:Actins; D000070416:Antagomirs; D051927:CD24 Antigen; D015820:Cadherins; D018960:Hyaluronan Receptors; D051795:Hypoxia-Inducible Factor 1, alpha Subunit; D007527:Isoenzymes; C524940:MIRN21 microRNA, human; D035683:MicroRNAs; D009841:Oligonucleotides; D014746:Vimentin; C520440:antagomir-122; D000080924:Aldehyde Dehydrogenase 1 Family; C510223:ALDH1A1 protein, human; D050697:Retinal Dehydrogenase