CSF1R mediates effects of miR-34a loss during intestinal tumorigenesis in ApcMin mice (tumor organoid)
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE167449 | GEO | 2022/10/04
REPOSITORIES: GEO
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Project description:To address the in vivo relevance of CSF1R regulation by miR-34a during intestinal tumor formation, we generated ApcMin/+ mice with intestinal-epithelial cell (IEC)-specific deletions of the Mir34a and/or Csf1r genes. The mRNA expression profiles of intestinal adenomas with and without functional miR-34a and/or Csf1r were compared.
2022-10-04 | GSE167448 | GEO
Project description:miR-34a and miR-34b/c genes are frequently epigenetically silenced in primary CRCs. However, the in vivo relevance of miR-34a/b/c for suppression of intestinal tumor formation has not been analyzed by genetic approaches. ApcMin/+ mice with deletion of the miR-34a and miR-34b/c genes were generated and analyzed. The mRNA expression profiles of intestinal adenomas with and without functional miR-34a/b/c genes were compared.
2017-05-28 | GSE84138 | GEO
Project description:Here we show that biotin-labelled miR-34a can be loaded to AGO2, and AGO2 immunoprecipitation can pulldown biotinylated miR-34a (Bio-miR pulldown). RNA-sequencing (RNA-seq) of the Bio-miR pulldown RNAs efficiently identified miR-34a mRNA targets, which could be verified with luciferase assays. In contrast to the approach of Bio-miR pulldown, RNA-seq of miR-34a overexpression samples had limited value in identifying direct targets of miR-34a. It seems that pulldown of 30 -Biotin-tagged miRNA can identify bona fide microRNA targets at least for miR34a.
2019-02-27 | GSE127211 | GEO
Project description:MicroRNAs (miRNAs or miRs) are small, noncoding RNAs that are implicated in the regulation of nearly all biological processes. Global miRNA biogenesis is altered in many cancers and RNA-binding proteins (RBPs) have been shown to play a role in this process, presenting a promising avenue for targeting miRNA dysregulation in disease. miR-34a exhibits tumor-suppressive functions by targeting cell cycle regulators CDK4/6 and anti-apoptotic factor Bcl-2, among other regulatory pathways such as Wnt, TGF-, and Notch signaling. Many cancers show downregulation or loss of miR-34a, and synthetic miR-34a supplementation has been shown to inhibit tumor growth in vivo; however, the post-transcriptional mechanisms by which miR-34a is lost in cancer are not entirely understood. Here, we have used a proteomics-mediated approach to identify Squamous cell carcinoma antigen recognized by T-cells 3 (SART3) as a putative pre-miR-34a-binding protein. SART3 is a spliceosome recycling factor and nuclear RBP with no previously reported role in miRNA regulation. We demonstrate that SART3 binds pre-miR-34a with specificity over pre-let-7d and begin to elucidate a new functional role for this protein in non-small lung cancer cells. Overexpression of SART3 led to increased miR-34a levels, downregulation of the miR-34a target genes CDK4 and CDK6, and cell cycle arrest in the G1 phase. In vitro binding studies showed that the RNA-recognition motifs within the SART3 sequence are responsible for selective pre-miR-34a binding. Collectively, our results present evidence for an influential role of SART3 in miR-34a biogenesis and cell cycle progression.
2019-10-14 | PXD015278 | Pride
Project description:Previous studies have evaluated the role of miRNAs in the initiation and progression of cancer. MiR-34a was found to be downregulated in several tumors, including medulloblastoma. We here analysed the function of miR-34a in vivo by targeted transgenesis to generate mice with constitutive deletion of the miR-34a gene, which resulted in the absence of mir-34a in all analysed tissues. Nevertheless, these mice were viable and fertile. A comprehensive standardized phenotypic analysis including more than 300 single parameters performed by the German Mouse Clinic revealed no apparent phenotype. Analysis of miR-34a expression in human medulloblastomas and medulloblastoma cell lines revealed significant downregulation as compared to human cerebellum. Re-expression of mir-34a in human medulloblastoma cells in vitro reduced cell viability, cell proliferation and induced apoptosis. Among the targets downregulated by miR-34a in human medulloblastoma cells were NMYC and SIRT1. Activation of the Shh pathway by targeted overexpression of SmoA1 causes medulloblastoma in mice, which is dependent on the presence and upregulation of NMYC. Analysis of miR-34a in ND2:SmoA1-derived medulloblastomas revealed significant suppression of miR-34a compared to normal cerebellum. Crossbreeding these mice with miR-34a knockout mice significantly accelerated medulloblastoma growth in mice deficient for miR-34a. Interestingly, NMYC and SIRT1 were highly expressed in medulloblastomas derived from these mice. We here demonstrate that miR-34a is dispensable for normal development, but that its loss accelerates medulloblastoma. Strategies aiming to re-express miR-34a in tumors could therefore represent an efficient therapy option. For genome-wide expression analysis total RNA from brain and thymus of three or four male miR34a and four control mice was isolated using RNeasy Midi kit (Qiagen, Hilden, Germany). The cDNA microarrays were generated, hybridized and analysed as described (Horsch et al 2009). Two chip hybridizations were performed with total RNA for each individual mutant mouse against a reference RNA pool of the same organ.
2014-09-22 | E-GEOD-40511 | biostudies-arrayexpress
Project description:P53 induced Mir34a is a tumor suppressor microRNA that plays important roles in cancer related processes such as proliferation, invasion and metastasis. Simultaneous loss of Mir34a and p53 is often observed in CRC. Here we show that, combined deletion of Mir34a and p53 has synergistic effects in suppressing tumor initiation, progression, invasion and metastasis in CRC by using mice lacking Mir34a and p53 in their intestinal epithelium. By in vivo inhibition of IL6R and SERPINE1, which we identified as up-regulated Mir34a targets in tumors of Mir34a/p53 deficient mice, we obtained preclinical evidence for their therapeutic value for treatment of sporadic CRC.
2018-08-31 | GSE99452 | GEO
Project description:The interferon-inducible transcription factor STAT1 is a tumor suppressor in various malignancies. We investigated STAT1 functions in intestinal tumorigenesis of ApcMin mice. Surprisingly, loss of STAT1 in intestinal epithelial cells (STAT1ΔIEC) interfered with ApcMin induced intestinal tumor formation and tumor progression. RNASeq data demonstrated reduced expression of Indoleamine-2,3-dioxygenase-1 (IDO1) in STAT1ΔIEC ApcMin tumors. IDO1 is implicated in synthesis of kynurenine, a metabolite that induces ß-Catenin nuclear localisation and suppresses anti-tumor immune responses.
2020-04-05 | E-MTAB-5083 | biostudies-arrayexpress
Project description:Analysis of metabolic pathway gene expression. The hypothesis tested in the present study is to assess mRNA level changes in metabolic genes in intestinal tumors from APCmin mice overexpressing PGC-1β specifically in the intestine. Total RNA obtained from ileum tumor samples from iPGC-1β/APCmin mice was compared to the total RNA extracted from FVBN/APCmin mice.
2015-03-01 | E-GEOD-61642 | biostudies-arrayexpress
Project description:Mast cells have been suggested to either promote or suppress tumor progression but the mechanisms underlying these outcomes are unclear. Here, we show that mice with a heterozygous mutation in the adenomatous polyposis coli gene (ApcMin/+) displayed reduced intestinal tumor burden and increased survival in the background of the chemokine decoy receptor ACKR2 deficiency (ACKR2-/-). The ACKR2-/-ApcMin/+ tumors showed increased infiltration of mast cells. In mast cell-deficient Sash (c-kitW-sh/W-sh) ACKR2-/-ApcMin/+ mice the survival advantage was lost as the tumors grew rapidly and adoptive transfer of mast cells reduced the tumor burden in these mice. The tumor burden is also increased in Rag2-/-ACKR2-/-ApcMin/+ mice and the protection is reconstituted by adoptively transferred CD8+ T-lymphocytes. Mast cells from ACKR2-/- mice expressed elevated levels of chemokine receptors CCR2 and CCR5 and are also efficient in antigen presentation and activation of CD8+ T-cells. Mast cell-derived leukotriene B4 is a critical mediator of CD8+ T-lymphocyte recruitment as the BLT1-/-ACKR2-/-ApcMin/+ mice are highly susceptible to intestinal tumor induced mortality. Taken together, these data demonstrate that chemokine mediated mast cell recruitment is essential for initiating LTB4/BLT1 regulated CD8+ T-cell homing and generation of effective anti-tumor immunity against intestinal tumor development.
2017-12-31 | GSE104829 | GEO
Project description:Analysis NCI-H1299 lung cancer cells transfected with synthetic oligo mimics for microRNAs (miRNAs) miR-34a and ghR-34a. We developed a 30-nucleotide single-strand RNA (ssRNA), termed “guide hairpin RNA (ghR),” that has a physiological function similar to that of miRNA and siRNA. The ghR caused no innate cytokine response either in vitro or in vivo. In addition, its structure does not contain a passenger strand seed sequence, reducing the potential for off-target effects relative to existing short RNA reagents. Systemic injection of ghR-form miR-34a (ghR-34a) suppressed tumor growth in a mouse model of RAS-induced lung cancer. Furthermore, ghR-34a functioned in a Dicer- and Ago2-independent manner. This novel RNAi technology may provide a novel, safe, and effective nucleic acid drug platform that will increase the clinical usefulness of nucleic acid therapy. MiR-34a–targeted mRNAs regulated by mRNA degradation rather than translational inhibition were identified using microarray data from miR-34 and ghR-34a transfectants.
2015-07-29 | E-GEOD-71423 | biostudies-arrayexpress