Unknown,Transcriptomics,Genomics,Proteomics

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Contribution of microRNA-1275 to Claudin11 suppression via polycomb-mediated silencing mechanism in human glioma stem-like cells

ABSTRACT: Glioblastomas show heterogeneous histological features, in which tumor cells show distinct phenotypic states that confer different functional attributes. This functional and morphological heterogeneity characterizes aggressive glioblastoma; however, molecular mechanisms underlying the heterogeneity are poorly understood. Glioma stem-like cells (GSCs) are considered able to aberrantly differentiate into diverse cell types and may contribute the establishment of tumor heterogeneity. Using the GSC model, we investigated the differentially expressed microRNAs(miRNAs) and associated epigenetic mechanism that regulate the differentiation of GSCs. MiRNA-microarray showed that 13 and 34 miRNAs were commonly upregulated and downregulated in two independent GSC lines during differentiation, respectively. Among those miRNAs, quantitative-PCR analysis showed that miR-1275 was consistently downregulated during the GSC differentiation along with the upregulation of its target, CLDN11, a marker of oligodendroglial-lineage differentiation. Compellingly, inhibition of miR-1275 with specific antisense oligonucleotide (anti-miR-1275) in GSC increased the expression of CLDN11, together with significant growth suppression. Epigenetic analysis revealed that gain of histone H3 lysine 27 trimethylation (H3K27me3) and loss of H3K9Ac in the pri-miR-1275 promoter were closely associated with the miR-1275 expression. Treatment of 3-Dezaneplanocin-A, an inhibitor of H3K27 methyltransferase, impaired the GSC differentiation in parallel with sustained miR-1275 expression. Our results illuminated the epigenetic regulatory pathways of miR-1275 closely associated with oligodendroglial differentiation, which may contribute to the tissue heterogeneity formation of glioblastomas. Inhibition of miR-1275 induces the GSC differentiation and suppresses tumor cell proliferation, miR-1275 may be a potential therapeutic target for glioblastomas. Human miRNA Microarray V3 kits (G4470C; Agilent Technologies, Santa Clara, California) were used according to the manufacturerM-bM-^@M-^Ys protocols. This microarray system contains probes for all 866 human and 89 human viral miRNAs reported from the Sanger database v12.0 (http://microrna.sanger.ac.uk/sequences/). Each miRNA species is printed 20 times with replicate probes on the array. Total RNA was isolated with TRIzol reagent (Invitrogen).M-cM-^@M-^@One hundred ng of total RNA was labeled with pCp-Cy3 (Agilent Technologies) and 15 units of T4 RNA ligase (GE Healthcare, Little Chalfont, Buckinghamshire, UK) at 16M-BM-0C for 2 hours. Labeled samples were purified with MicroBio-Spin 6 columns (Bio-Rad, Richmond, CA) and hybridized to microarray at 55 M-BM-0C with rotation at 20 rpm for 20 hours. Microarrays were scanned by an Agilent Scanner (Agilent Scan Control 7.0 software) and analyzed using Agilent Feature Extraction 10.7 software for miRNA microarray.

ORGANISM(S): Homo sapiens

SUBMITTER: Keisuke Katsushima

PROVIDER: E-GEOD-36201 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Transcriptional profilling of human GSC comparing undifferentiated (ND) and differentiated (Diff 0.5%) GSC treated or not with TWS119 (LW) an inhibitor of GSK3beta Glioblastomas (GBM) are the most common form of primary brain tumors. Highly vascularized, infiltrating, resistant to current therapies, they affect patients at different ages. The median survival is shorter than 18 months. GBM follow the cancer stem cell (CSC) model. This concept proposes that a minority of cells within the tumor mass, with long term self-renewal and differentiation properties, is responsible for the initiation and the growth of tumors. CSCs provide all the subtypes of cells that compose the tumor, including endothelial cells and pericytes. Their functional properties are associated with a molecular signature combining makers of neural and/or embryonic stem cells, and markers of mesenchymal cells. A growing body of evidences supports that tumorâs behavior, including proliferation, progression, invasion and â most importantly - a great part of resistance to therapies are determined by these self-renewing tumor cells. It is becoming therefore evident that failure of current treatments to eliminate glioma-initiating cells (GiCs) contributes to tumor recurrence. Targeting GiCs and their stem-like properties constitutes thus one of the main therapeutic challenges to significantly improve anti-cancer treatments. A relevant solution to target GiCs, is to force them to acquire a non self-renewing state. Under this non stem-like state, the cells lose their tumorigenicity and become vulnerable to therapies. We observed that GiC differentiation is associated to an increase of active GSK3beta expression. Suppression of this activation using a chemical inhibitor (TWS119) altered the differentiation process. To identify transcroptomic changes due to GSK3beta inhibition during differentiation, we have differentiated two GiC cultures (TG1, and TG6) treated or not with TWS119. Total mRNA have been extracted and compared to mRNA extracted from self-renewing TG1 and TG6 cells. For these experiments we used âAgilent human genome whole 44Kâ chips. two-condition experiment, undifferentiated GSC (ND) vs. Differentiated (diff 0.5%) and undifferentiated GSC (ND) versus differentiated GSC treated with TWS119 (diff 0.5%LW) in monoplicate in TG1 and in TG6 cells (two different primary cultures of GSC).

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Contribution of microRNA-1275 to Claudin11 suppression via polycomb-mediated silencing mechanism in human glioma stem-like cells

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