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Tumor suppression by miR-26 overrides potential oncogenic activity in intestinal tumorigenesis

ABSTRACT: Through a series of mouse genetic studies, we concluded that miR-26 overexpression in intestinal epithelial cells inhibits tumor formation in Apcmin/+ mice. We isolated intestinal epithelial cells from M2rtTA and M2rtTA; eGFP.miR-26a to assess gene expression changes after the induction of miR-26a expression. Intestinal epithelial cells were isolated from three M2rtTA and three M2rtTA; eGFP.miR-26a mice after treatment with doxycycline for 10 days. Gene expression was profiled using Illumina microarrays.

ORGANISM(S): Mus musculus

SUBMITTER: Joshua Mendell

PROVIDER: E-GEOD-62831 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Tumor suppression by miR-26 overrides potential oncogenic activity in intestinal tumorigenesis

Project description:Through a series of mouse genetic studies, we concluded that miR-26 overexpression in intestinal epithelial cells inhibits tumor formation in Apcmin/+ mice. We isolated intestinal epithelial cells from M2rtTA and M2rtTA; eGFP.miR-26a to assess gene expression changes after the induction of miR-26a expression.

2014-10-30 | GSE62831 | GEO

CSF1R mediates effects of miR-34a loss during intestinal tumorigenesis in ApcMin mice (adenoma)

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CSF1R mediates effects of miR-34a loss during intestinal tumorigenesis in ApcMin mice (tumor organoid)

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miR-34a and miR-34b/c suppress intestinal tumorigenesis in ApcMin/+ Mice

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Mouse Articular chondrocyte LC-MSMS of wild-type, miR-26a -/- and cartilage-specific miR-23ab clusters knockout mice

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2023-01-25 | PXD031868 | Pride

miR-26 suppresses adipocyte progenitor differentiation and fat production by targeting Fbxl19

Project description:Purpose: Fat storage in adult mammals is a highly regulated process that involves the mobilization of adipocyte progenitor cells (APCs) that differentiate to produce new adipocytes. Here we report an unexpected role for the broadly conserved miR-26 family of microRNAs (miR-26a-1, miR-26a-2, and miR-26b) as key regulators of APC differentiation. Global loss of miR-26 resulted in a dramatic expansion of adipose tissue in adult mice fed normal chow. Conversely, transgenic overexpression of miR-26a protected mice from high fat diet-induced obesity. These effects were attributable to a cell-autonomous function of miR-26 as a potent inhibitor of APC differentiation. miR-26 blocks adipogenesis, at least in part, by repressing expression of Fbxl19, a conserved miR-26 target without a previously known role in adipocyte biology that encodes a component of SCF-type E3 ubiquitin ligase complexes. These findings have therefore revealed a new pathway that plays a critical role in regulating adipose tissue formation in vivo and suggest new potential therapeutic targets for obesity and related disorders.

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Notch signaling suppresses the progression of colorectal tumorigenesis

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Fetal blood transcriptome in maternal anti-fetal rejection

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Innate mesenchymal TLR4/MyD88 signals promote spontaneous intestinal tumorigenesis

Project description:This study shows that the TLR4/MyD88 pathway in intestinal mesenchymal cells promotes intestinal carcinogenesis in the APCmin mouse model.

2019-01-15 | GSE119341 | GEO

Effects of miR-26a expression and miRNA-sponge-mediated miR-26 family knockdown on the transcriptome of B cell precursors

Project description:Here, we have screened a miRNA expression library in a pre-B cell expression system to identify miRNAs with a potential oncogenic activity in early lymphocytes. We show that miR-26a is sufficient to transform B cell precursors in vitro as defined by growth factor independence, and demonstrate that its continuous expression is necessary to keep cells in the transformed state. Mechanistically, we find that expression of miR-26a protects against apoptosis induced by growth factor withdrawal as well as DNA damage, provides a competitve advantage and interferes with the differentiation of pre-B to immature B cells. In consequence, transformed cells express the pre-BCR on the cell surface, which appears to provide signals for ongoing proliferation and survival. Using microarray analysis, we identified several previously known and novel putative target genes of miR-26a in B cell precursors. A key target appears to be PTEN, a well established tumor suppressor and regulator of PI3K signaling, as knockdown of Pten mRNA by shRNA at least partially phenocopies miR-26a overexpression. To gain inside into the physiological role of miR-26 in early B cell develobment, in contrast to the oncogenic situation if aberrantly overexpressed, we further more sequestered endogenous miR-26a and b by expression of a miRNA sponge. This functional knockdown indeed induced the reciprocal phenotype relative to the overexpression, i.e. cells had a proliferative disadvantage and differentiated more efficient into immature B cells. Surprisingly, however, transcriptional changes induced by miR-26 sequestration were very mild. We therefoer hypothesize that most of the sponge-mediated deregulation is below detection level while still being functional relevant.

2022-01-01 | GSE186236 | GEO

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