Abstract:
:MicroRNAs (miRNAs) play important roles in normal cellular differentiation and oncogenesis. microRNA93 (mir-93), a member of the mir106b-25 cluster, located in intron 13 of the MCM7 gene, although frequently overexpressed in human malignancies may also function as a tumor suppressor gene. Using a series of breast cancer cell lines representing different stages of differentiation and mouse xenograft models, we demonstrate that mir-93 modulates the fate of breast cancer stem cells (BCSCs) by regulating their proliferation and differentiation states. In "claudin(low)" SUM159 cells, expression of mir-93 induces Mesenchymal-Epithelial Transition (MET) associated with downregulation of TGFβ signaling and downregulates multiple stem cell regulatory genes, including JAK1, STAT3, AKT3, SOX4, EZH1, and HMGA2, resulting in cancer stem cell (CSC) depletion. Enforced expression of mir-93 completely blocks tumor development in mammary fat pads and development of metastases following intracardiac injection in mouse xenografts. The effect of mir-93 on the CSC population is dependent on the cellular differentiation state, with mir-93 expression increasing the CSC population in MCF7 cells that display a more differentiated "luminal" phenotype. mir-93 also regulates the proliferation and differentiation of normal breast stem cells isolated from reduction mammoplasties. These studies demonstrate that miRNAs can regulate the states and fates of normal and malignant mammary stem cells, findings which have important biological and clinical implications.
journal_name
PLoS Genetjournal_title
PLoS geneticsauthors
Liu S,Patel SH,Ginestier C,Ibarra I,Martin-Trevino R,Bai S,McDermott SP,Shang L,Ke J,Ou SJ,Heath A,Zhang KJ,Korkaya H,Clouthier SG,Charafe-Jauffret E,Birnbaum D,Hannon GJ,Wicha MSdoi
10.1371/journal.pgen.1002751subject
Has Abstractpub_date
2012-01-01 00:00:00pages
e1002751issue
6eissn
1553-7390issn
1553-7404pii
PGENETICS-D-12-00979journal_volume
8pub_type
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