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Evaluation of microRNA expression in vehicle and metformin-treated breast cancer cells and evaluation of the dicer relevance

ABSTRACT: We have evaluated the microRNA expression profile of SUM159 cells stably infected with a control shRNA or a dicer-targeting shRNA treated with vehicle or metformin for 24 hrs at non cytotoxic doses.

ORGANISM(S): Homo sapiens

PROVIDER: GSE37038 | GEO | 2012/06/05

SECONDARY ACCESSION(S): PRJNA157853

REPOSITORIES: GEO

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Evaluation of microRNA expression in vehicle and metformin-treated breast cancer cells and evaluation of the dicer relevance

Project description:We have evaluated the microRNA expression profile of SUM159 cells stably infected with a control shRNA or a dicer-targeting shRNA treated with vehicle or metformin for 24 hrs at non cytotoxic doses. microRNA expression was evaluated from total RNA extracted from logaritmically growing SUM159 cells stably expressing a control shRNA or a dicer-targeting shRNA and treated with vehicle (PBS) or metformin (0.5mM) for 24 hrs.

2012-06-04 | E-GEOD-37038 | biostudies-arrayexpress

Metformin Induces Dicer via Regulation of the RNA-binding protein AUF1

Project description:Metformin has been commonly used for decades to treat type 2 diabetes. Recent data indicates that mice treated with metformin live longer and healthier lives. Here, we show that chronic metformin exposure in mice and diabetics taking metformin have higher levels of the microRNA processing protein, Dicer. Examination of how metformin affects Dicer expression revealed that metformin alters binding of the AUF1 RNA-binding protein to DICER1 mRNA, which leads to stabilization of DICER1 mRNA. We found differential changes in microRNA expression in mice treated with metformin or caloric restriction, a proven life extending intervention. Several of these microRNAs are important for regulating cellular senescence and lifespan in model organisms. Consistent with this observation, treatment with metformin decreased cellular senescence in a Dicer-dependent manner. These data lead us to hypothesize that changes in Dicer levels may be important for organismal aging and that interventions that upregulate Dicer expression (e.g., metformin) may offer new therapeutic approaches to combat or prevent age-related diseases. Key words: diabetes mellitus, metformin, senescence, miRNA, RNA-binding proteins

2017-02-14 | GSE73393 | GEO

Evaluation of microRNA expression in vehicle and metformin-treated breast cancer cells and evaluation of the dicer relevance

Project description: Not available

| S-ECPF-GEOD-37038 | biostudies-other

Expression data from kidney tissues treated with vehicle, losartan and metformin

Project description:Chronic kidney disease (CKD) is one of the major global health problems with high incidence, poor prognosis and high medical cost. However, few pharmacological options are available for CKD. Metformin is widely used for treatment of type-2 diabetes, but recent works showed that metformin ameliorates tumor progression, inflammatory disease and tissue fibrosis. Whether metformin ameliorates non-diabetic chronic glomerular disease and CKD is unexplored. Here we showed that metformin or losartan (used as control) has protective effects against CKD by suppressing proteinuria, renal inflammation, fibrosis and glomerular injury in Alport syndrome mouse model, which spontaneously manifests chronic glomerular and kidney disease. Transcriptome analysis showed that metformin and losartan influenced molecular pathways of metabolism and inflammation, respectively. While metformin specifically affected genes that were classified as metabolic regulators, losartan specifically altered genes that were classified as inflammatory regulators. Metformin also induced multiple signaling pathways not affected by losartan. Overall, metformin ameliorates non-diabetic chronic glomerular diseases, and could be considered a therapeutic option for CKD. We used microarrays to investigate the global gene expression underlying the protective effects of metformin on Alport syndrome mice model

2021-01-30 | GSE109861 | GEO

Two-motif model illuminates DICER's cleavage preferences [DICER]

Project description:DICER is a key regulator of gene expression in animals through its production of miRNAs and siRNAs by processing shRNA. To advance our understanding of this process, we employed high-throughput assays using various shRNA variants and both wild-type and mutant DICER (DICERΔdsRBD). Our analysis revealed that DICER predominantly cleaves shRNAs at two positions, specifically at 21 (DC21) and 22 (DC22) nucleotides from the 5'-end. Our investigation identified two independent motifs, mAHG and YSR, that determine whether DICER cleaves at DC21 or DC22, depending on their location in shRNA/pre-miRNAs. These motifs can work together or independently to determine the cleavage sites of DICER. Furthermore, our findings indicate that dsRBD enhances cleavage at DC21, and mAHG strengthens the interaction between dsRBD and RNA, leading to an even greater enhancement of DC21 cleavage. Conversely, YSR functions independently of dsRBD. Our study proposes a two-motif model that sheds light on the intricate regulatory mechanisms involved in gene expression by elucidating how DICER recognizes its substrate, providing valuable insights into this critical biological process.

2023-09-06 | GSE226874 | GEO

The high-throughput DICER cleavage assays on 23296 shRNA variants

Project description:The high-throughput DICER cleavage assays were conducted shRNA variants containing different sequences. We showcase a comprehensive cleavage activity of DICER on different shRNAs containing different secondary structures.

2022-02-21 | GSE182701 | GEO

Expression data from human primary fibroblasts (IMR90) stably expressing H-RasV12 and treated with Metformin or vehicle

Project description:Metformin reduces the incidence of cancer in diabetics or in animal models. At the cellular level, the effects of metformin include the inhibition of complex I of the mitochondrial electron transport chain, a reduction in ATP levels and the activation of the energy sensor AMP kinase. Metformin also prevents the production of reactive oxygen species in primary human cells expressing oncogenic ras and the DNA damage associated to the process. We used microarrays to characterize the gene expression changes induced by metformin in primary human fibroblasts expressing oncogenic ras.

2013-04-01 | GSE33612 | GEO

Ago2 or Dicer knockdown effects on mRNA levels in HeLa

Project description:Analysis of mRNA changes in HeLa cells following Ago2 or Dicer depletion. Dicer, a cytoplasmic RNase III, generates the mature form of small RNAs including microRNA. Ago2 is a component of an effector complex of microRNA. Keywords: gene expression array-based (RNA / in situ oligonucleotide) siRNA against Ago2 or Dicer were trasnfected into HeLa cells. siRNA against GFP was used as a control. Biologically duplicated total RNAs were prepared from HeLa cells, 24 hrs and 48 hrs after siRNA transfection.

2009-02-04 | E-GEOD-13638 | biostudies-arrayexpress

RNAseq of C. elegans cultured on metformin sensitive and resistant E. coli strains with and without 50mM metformin treatment.

Project description:Metformin is the therapy of choice for treating type 2 diabetes and is currently repurposed for a wide range of diseases including aging. Recent evidence implicates the gut microbiota as a site of metformin action. Combining two tractable genetic models, the bacterium E. coli and the nematode C. elegans, we performed C. elegans RNAseq to investigate the role of the metformin sensitive OP50 and metformin resistant OP50-MR E. coli microbiota in the drug effects on the host. Our data suggest an evolutionarily conserved bacterial mediation of metformin effects on host lipid metabolism and lifespan.

2019-07-13 | E-MTAB-7272 | biostudies-arrayexpress

DICER-interacting partners in juvenile mouse testes

Project description:DICER has a well-characterized role in the processing of microRNAs (miRNAs) and small interfering RNAs (siRNA) that are important for post-transcriptional gene regulation. Emerging evidence suggests that DICER also has several non-canonical functions beyond miRNA/siRNA biogenesis, for example in transcriptional gene silencing at the chromatin level, as well as in RNA degradation and maintenance of genomic integrity. We have shown that the function of DICER in germ cells is essential for normal spermatogenesis; male mice lacking DICER in postnatal male germ cells are infertile due to severe defects in haploid differentiation. To better understand the function of DICER in male germ cells, we immunoprecipitated DICER from juvenile mouse testes and performed mass spectrometric analysis to identify DICER-interacting proteins.

2020-06-03 | PXD017772 | Pride

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