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LincK promotes proliferation and epithelial-to-mesenchymal transition and contributes to tumorigenesis and growth in breast cancer I

ABSTRACT: In this study, we aimed to identify potential lncRNA deregulations associated with breast cancer malignancy instigated by MSCs-MCF7 co-culture. We profiled expression changes of lncRNAs in MCF-7 cells during EMT induced by coculture with hAD-MSCs, and found an intergenic lncRNA with proviouly unknown function (KB-1732A1.1, we termed it LincK), which was significantly elevated. Depletion of LincK decreased the growth, migration, invasion, and EMT in breast cancer cells, while overexpression of LincK exerted the opposite effects. Moreover, knockdown of LincK repressed tumorigenesis, and ectopic expression of LincK promoted tumor growth in MCF-7 xenograft model. LincKs can act as a sponge of mirR-200b, which inhibits its function in proliferation and metastasis. Thus we reported, for the ﬁrst time, the role of LincK in control of EMT and proliferation in breast cancer. We used microarrays to detail the genes associated with LincK.

ORGANISM(S): Homo sapiens

PROVIDER: GSE109007 | GEO | 2019/01/09

REPOSITORIES: GEO

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Project description:The subpopulations of mesenchymal stem cells isolated from breast adipose tissue which display migrated towards conditioned media from MDA-MB231 cell line were expanded for miRNA analysis. The tumor microenvironment (TM) is known to promote tumor growth and progression. Ubiquitously distributed tissue resident stem cells (MSCs) elicit regenerative properties. In addition, they are capable of homing to sites of inflammation, injury, and tumor. Considering the tumor tropic property of MSCs, the interaction between the breast cancer (BC) microenvironment and breast resident adipose tissue derived MSCs (ASCs) merits further investigations. Initial data indicate that a subset of ASCs derived from breast adipose tissue (B-ASCs) display a high affinity towards the conditioned media (CM) from two breast cancer cell lines, MDA-MB231 (MDA-CM) and MCF7 (MCF-CM). Profiling secreted cytokines of these CMs identified significant expression of angiogenin, GM-CSF, and IL-6. While the expression of GRO-M-NM-1, MCP-1, RANTES, and IL-1M-NM-1 is more pronounced in MDA-CM, MCF-CM contains higher amounts of IGFBP2, TRAIL, and ErbB3. Gene expression profiling suggests that despite the distinct differences, both migratory subset of B-ASCs towards MDA-CM and MCF-CM display perturbed expression of genes like KISS1, TNSF1, IL18 and MMP2, which could be associated with a defensive role of B-ASCs. In addition, the BC microenvironment alters microRNA (miRNA) expressions in B-ASCs. in this study the migratory cells were evaluated for miRNA expression versus non-migratory counterparts. as controls unexposed parental cell lines (2) were used on the same hybridization chip in which one labeled Hy3 and other labeled Hy5. The ratio of the control parental cells was used as base nanalysis of miRNA expression in MSCs. we also include another control in this study, the migratory subpopulations of MSCs which display migratory potentials against protein gradient (M5) were analyzed for miRNA expression versus non-migratory counterparts (NM-5). using this control facilitate identification of those miRNA responsive to tumor CM. the data analysis confirm that altered gene and miRNA profiles resulted from exposure of MCF-CM and MDA-CM on B-ASCs are similar to those observed in B-ASCs isolated from breast adipose tissue of BC patients. Analysis the signaling between the B-ASCs and TM may help in understanding the possible role of B-ASCs in stasis, progression, or regression of the BC. The microRNA expression of migratory subpopulations were compared to parental populations of MSCs.

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LincK promotes proliferation and epithelial-to-mesenchymal transition and contributes to tumorigenesis and growth in breast cancer I

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