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Characterization of microRNA-493-5p targets in liver cell lines

ABSTRACT: Numerous studies have described the critical role played by microRNAs (miRNAs) in cancer progression and the potential of these small non-coding RNAs for diagnostic or therapeutic applications. However, the mechanisms responsible for the altered expression of miRNAs in malignant cells remain poorly understood. Herein, via epigenetic unmasking, we identified a group of miRNAs located in the imprinted delta like non-canonical Notch ligand 1 (DLK1)-maternally expressed 3 (MEG3) locus that were repressed in hepatic tumor cells. Notably, miR-493-5p epigenetic silencing was correlated with hypermethylation of the MEG3-differentially regulated region (DMR) in liver cancer cell lines and tumor tissues from patients. Experimental rescue of miR-493-5p promoted an anti-cancer response by hindering hepatocellular carcinoma (HCC) cell growth in vitro and tumor progression in vivo. We found that miR-493-5p mediated part of its tumor-suppressor activity by abrogating overexpression of insulin-like growth factor 2 (IGF2) and the IGF2-derived intronic oncomir miR-483-3p in HCC cells characterized by IGF2 loss of imprinting (LOI). In summary, this study describes an unknown miRNA-dependent regulatory mechanism between two distinct imprinted loci and a possible therapeutic window for liver cancer patients exhibiting IGF2-miR-483 LOI and amplification.

ORGANISM(S): Homo sapiens

PROVIDER: GSE123313 | GEO | 2018/12/05

REPOSITORIES: GEO

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Characterization of epigenetically silenced microRNAs in liver cancer cells

Project description:Numerous studies have described the critical role played by microRNAs (miRNAs) in cancer progression and the potential of these small non-coding RNAs for diagnostic or therapeutic applications. However, the mechanisms responsible for the altered expression of miRNAs in malignant cells remain poorly understood. Herein, via epigenetic unmasking, we identified a group of miRNAs located in the imprinted delta like non-canonical Notch ligand 1 (DLK1)-maternally expressed 3 (MEG3) locus that were repressed in hepatic tumor cells. Notably, miR-493-5p epigenetic silencing was correlated with hypermethylation of the MEG3-differentially regulated region (DMR) in liver cancer cell lines and tumor tissues from patients. Experimental rescue of miR-493-5p promoted an anti-cancer response by hindering hepatocellular carcinoma (HCC) cell growth in vitro and tumor progression in vivo. We found that miR-493-5p mediated part of its tumor-suppressor activity by abrogating overexpression of insulin-like growth factor 2 (IGF2) and the IGF2-derived intronic oncomir miR-483-3p in HCC cells characterized by IGF2 loss of imprinting (LOI). In summary, this study describes an unknown miRNA-dependent regulatory mechanism between two distinct imprinted loci and a possible therapeutic window for liver cancer patients exhibiting IGF2-miR-483 LOI and amplification.

2018-12-05 | GSE123314 | GEO

Characterization of microRNA-493-5p targets in liver cell lines (2nd set of data)

Project description:Primary hepatic tumors mainly include hepatocellular carcinoma (HCC), which is one of the most frequent causes of cancer-related deaths worldwide. Thus far, HCC prognosis has remained extremely poor given the lack of effective treatments. Numerous studies have described the roles played by microRNAs (miRNAs) in cancer progression and the potential of these small noncoding RNAs for diagnostic or therapeutic applications. The current consensus supports the idea that direct repression of a wide range of oncogenes by a single key miRNA may critically affect the malignant properties of cancer cells in a synergistic manner. In this study, we aimed to investigate the oncogenes controlled by miR-493-5p, a major tumor suppressor miRNA that inactivates miR-483-3p oncomir in hepatic cancer cells. Using global gene expression analysis, we highlighted a set of candidate genes potentially regulated by miR-493-5p. In particular, the canonical MYCN proto-oncogene (MYCN) appeared to be an attractive target of miR-493-5p given its significant inhibition via 3’-UTR targeting in miR-493-5p-rescued HCC cells. We showed that MYCN was overexpressed in liver cancer cell lines and clinical samples from HCC patients. Notably, MYCN expression levels were inversely correlated with miR-493-5p in tumor tissues. We confirmed that MYCN knockdown mimicked the anti-cancer effect of miR-493-5p by inhibiting HCC cell growth and invasion, whereas MYCN rescue hindered miR-493-5p activity. In summary, miR-493-5p is a pivotal miRNA that modulates various oncogenes after its re-expression in liver cancer cells, suggesting that tumor suppressor miRNAs with a large spectrum of action may provide valuable tools for miRNA replacement therapies.

2019-01-22 | GSE125407 | GEO

Identification of genes suppressed by miR-483-5p and miR-551a in a colon cancer cell-line (study 2)

Project description:miR-483-5p and miR-551a were over-expressed in a colon cancer cell-line LvM3b to identify genes that are down-regulated by the miRNAs over-expression. Total RNA was isolated from miR-483-5p or miR-551a over-expressing LvM3b cells as well as control LvM3b cells.

2015-01-16 | E-GEOD-63201 | biostudies-arrayexpress

Identification of genes suppressed by miR-483-5p and miR-551a in a colon cancer cell-line

2015-01-16 | E-GEOD-63041 | biostudies-arrayexpress

Applied Biosystems Human TaqMan Low Density Array (TLDA) in plasma samples from HCC cases and controls

Project description:MicroRNAs (miRNAs) are abundant in the circulation and play a central role in diverse biological processes; they may be useful for early diagnosis of hepatocellular carcinoma (HCC). We conducted a two-phase, case-control study (20 pairs for the discovery set and 49 pairs for the validation set) to test the hypothesis that genome-wide dysregulation of circulating miRNAs differentiate HCC cases from controls. Taqman low density arrays were used to examine genome-wide miRNA expression for the discovery set, and quantitative RT-PCR was used to validate candidate miRNAs for both discovery and validation sets. Sixty-six miRNAs were found to be significantly over-expressed in plasma of HCC cases compared to controls after adjusting for false discovery rate (p<0.05). A volcano plot indicated that 7 miRNAs had greater than 2-fold case-control differences with p<0.01. Four significant miRNAs (miR-150, miR-30c, miR-483-5p and miR-520b) detectable in all samples with varied expression levels were further validated in a validation set. MiR-483-5p was statistically significantly over-expressed in HCC cases compared with controls (3.20 vs. 0.82, p<0.0001). HCC risk factors and clinic-pathological characteristics did not influence miR-483-5p expression. The combination of plasma miR-483-5p level and HCV status can significantly differentiate HCC cases from controls with an AUC of 0.908 (p<0.0001). The sensitivity and specificity were, respectively, 75.5% and 89.8%. These preliminary results suggest the importance of dysregulated circulating miR-483-5p as a potential HCC biomarker. Confirmation of aberrant expression of miR-483-5p in a large prospective HCC study will provide support for its application to HCC detection.

2013-08-21 | GSE50013 | GEO

Carcinoma of the colon and rectum with deregulation of insulin-like growth factor 2 signaling: clinical and molecular implications

Project description:We here show that loss of imprinting (LOI) of IGF2 is a frequent and early event in the development of colon cancer and occurs throughout the large intestine. LOI leads to AKT1-dependent activation and suppression of a defined set of genes, many of which are cell cycle related. Our results further showed that IGF2 induces non-canonical wnt signaling. We hypothesize that IGF2 and Wnt5a cooperate in cancer progression. LOI is an attractive target for tumor prevention or targeted therapy. This is a comparison of colon cancer samples with (LOI) and without (ROI) loss of imprining of IGF2. All cases were from the sigmoid colon and were in UICC tumor stage pT2 N0 M0.

2016-07-04 | E-GEOD-66726 | biostudies-arrayexpress

Loss of imprinting mutations define both distinct and overlapping roles for misexpression of IGF2 and H19 lncRNA

Project description:Imprinted genes occur in discrete clusters that are coordinately regulated by shared DNA elements. H19 and Igf2 are linked imprinted genes that play critical roles in development. Loss of imprinting at the IGF2/H19 locus is associated with Beckwith Wiedemann Syndrome (BWS). Here we use comprehensive genetic and genomic analyses to follow muscle development in a mouse model of BWS to dissect the separate and shared roles for Igf2 and H19 in the disease phenotype. We show that LOI results in defects in muscle differentiation and hypertrophy and we identify primary downstream targets of Igf2 (MAPK signaling) and of H19 (AKT/mTOR signaling). Moreover, we demonstrate instances where H19 and Igf2 misexpression work separately, cooperatively, and also antagonistically to establish the disease phenotype. This study underscores the fact that LOI phenotypes are multigenic and complex interactions contribute to disease outcomes.

2017-09-25 | GSE89136 | GEO

RNA-sequencing analysis gene expression changes in response to ischemia reperfusion and upon manipulation of miR-483-5p in PC12 highly differentiated cells

Project description:The consequences of cardiac arrest are often fatal, including brain injury after resuscitation. It has been reported that few people patients can recover to the neurological state before cardiac arrest. MiRNAs are short non-protein-coding RNA molecules that are evolutionarily conserved and ubiquitously expressed. Numerous pieces of research have reviewed the role of miRNAs in regulating neuronal apoptosis, regeneration, and plasticity of neurons, and inflammatory after cardiac arrest . As the stability of miRNAs in the bloodstream and the function in the regulation of neurological impairment after ischemia-reperfusion injury, microRNAs have been the most potential new biomarkers and therapeutic targets after cardiac arrest to alleviate neurological impairment . In this work, we found that the level of miR-483-5p is correlated to the prognosis of neurological function. To investigate the function of miR-483-5p on neurons after ischemia-reperfusion injury,we established highly differentiated PC12 cell lines in which miR-483-5p was overexpressed by transfection with miR-483-5p mimcis.We then performed gene expression profiling analysis using data obtained from RNA-seq of PC12 cells in different groups.

2022-07-25 | GSE209531 | GEO

microRNA Profiling in Wilms Tumors and Kidney Tissues

Project description:The IGF2-intronic miR-483 selectively enhances transcription from IGF2 fetal promoters and enhances tumorigenesis.

2013-12-22 | GSE50505 | GEO

MicroRNA expression profiling of Igf2-p and H19-m mutant mouse embryos

Project description:Changes in microRNA expression in Igf2-p and H19-m mouse embryos (E9.5) were determined in order to assess whether perturbation of miR-483* and miR-675 in Igf2-p and H19-m mutants was likely to have contributed to a modification of tumour phenotype. The Igf2 gene contains miR-483* but the targeted deletion of Igf2-p in these mice spares the region encoding this microRNA. The H19 gene contains miR-675 and its expression was mono-allelelic in heterozygous H19-m mice as evidenced by a significant reduction in miR-675 in these mice relative to WT.

2011-12-01 | E-MTAB-873 | biostudies-arrayexpress

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