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RNAi knock down using siRNAs targeting PROX1 or Â§-catenin in human colon carcinoma cells

ABSTRACT: PROX1 or §-catenin was depleted in SW480 by siRNA transfection and the gene expression profiles were compared to negative controls to study the genes affected.

ORGANISM(S): Homo sapiens

SUBMITTER: Tatiana Petrova

PROVIDER: E-MTAB-717 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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RNAi knock down using siRNAs targeting PROX1 or GFP in human colon carcinoma cells

Project description:siRNA transfection using either two different siRNAs targeting PROX1 or GFP

2008-09-03 | E-MEXP-1422 | biostudies-arrayexpress

Comparison of Prox1 expressing and Prox1 knockout intestinal tumors and the effect of A2V+CD40

Project description:Control or A2V+CD40 treated Prox1-proficient (AP) and Prox1-deficient (APP) tumors

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Prox1 (Prosper-related homeobox 1) transcription factor depletion effect on CGTH-W-1 cells.

Project description:Analysis of CGTH-W-1 follicular thyroid carcinoma cells transcriptome following 48 hrs siRNA-mediated depletion of PROX1. PROX1 is a homeobox transcription factor. PROX1 depletion decreases migratory ability, motility and invasivness and induces profound cytoskeleton changes of CGTH-W-1 cells. Results provide insight into the role of PROX1 in the thyroid cancer. Three biological replicates for a given condition

2016-07-31 | E-GEOD-80135 | biostudies-arrayexpress

SW480R

Project description:SW480R is an APC mut, KRAS mut, P53 mut CRC cell line. PROX1 transcription factor, target of Wnt pathway in CRC, is our protein of interest.SW480R cells are PROX1 positive. We suppressed through siRNA transfection the expression of PROX1 protein or non-targeting siRNA, using two different siRNA. Afterwards we compared the transcriptional program of the SW480-PROX1si and SW480R-CTRsi cells growing in monolayer in vitro.

2014-09-18 | E-MTAB-2021 | biostudies-arrayexpress

Fasting-sensitive SUMO-switch on Prox1 controls hepatic cholesterol metabolism

Project description:Accumulation of excess nutrients hampers proper liver function and is linked to non-alcoholic fatty liver disease (NAFLD) in obesity. However, the signals responsible for an impaired adaptation of hepatocytes to obesogenic dietary cues remain still largely unknown. Post-translational modification by the Small Ubiquitin-like Modifier (SUMO), allows for adynamic regulation of numerous processes including transcriptional reprograming. We demonstrate that specific SUMOylation of transcription factor Prox1 represents a nutrient-sensitive determinant of hepatic fasting metabolism. Prox1 was highly SUMOylated on lysine 556 in the liver of ad libitum and re-fed mice, while this modification was abolished upon fasting. In the context of diet-induced obesity, Prox1 SUMOylation became less sensitive to fasting cues. The hepatocyte-selective knock-in of a SUMOylation-deficient Prox1 mutant into mice fed a high-fat/high-fructose diet led to a reduction of systemic cholesterol levels, associated with the induction of liver bile acid detoxifying pathways during fasting. The generation of tools to maintain the nutrient-sensitive SUMO-switch on Prox1 may thus contribute to the development of “fasting-based” approaches for the preservation of metabolic health.

2023-10-24 | PXD041329 | Pride

Prox1 haploinsufficiency sensitizes the pancreas to KrasG12D-induced transformation

Project description:Oncogenic mutations in Kras initiate neoplastic transformation in the pancreas through a process that hijacks the activity of developmental regulators and induces an inflammatory microenvironment. We report that the homeodomain transcription factor Prox1 is a novel component of a progenitor signature that is activated in acinar cells undergoing dedifferentiation and ductal metaplasia conversion. Also, the conditional deletion of a single Prox1 allele markedly accelerates early transformation and significantly enhances features of inflammation in pancreatic tissues carrying a Kras oncogene. By using in vitro and in silico approaches, we demonstrate that Prox1 negatively regulates the expression of proinflammatory genes and genes implicated in malignant transformation in pancreatic cells. Microrrays were used to identify gene expression profiles and pathways that are differentially activated after enforced expression of PROX1 in the PROX1-negative human pancreatic ductal adenocarcinoma (PDAC) cell line Capan1. MSCV retroviral transduction was used to generate Capan1 cells that ectopically express PROX1 and selected for puromycin resistance. Three independent transductions with control virus (MSCV_puro) and 3 independent transductions with Prox1-cDNA virus (MSCV_PROX1_puro) were conducted for these experiments.

2016-02-11 | E-GEOD-58547 | biostudies-arrayexpress

Dicer1 imparts essential survival cues in Notch driven T-ALL via miR-21 mediated tumor suppressor Pdcd4 repression

Project description:This SuperSeries is composed of the SubSeries listed below. Refer to individual Series

2015-05-08 | E-GEOD-68635 | biostudies-arrayexpress

Prox1 inhibits axon outgrowth during central nervous system development

Project description:During central nervous system (CNS) development, proper and timely induction of axon elongation is critical for generating functional, mature neurons and neuronal networks. Despite the wealth of information on the action of extracellular cues, little is known about the intrinsic gene regulatory factors that control this developmental decision. Here we report the identification of Prox1, a homeobox transcription factor, as a key player in inhibiting axon elongation. Although Prox1 promotes acquisition of early neuronal identity and is expressed in nascent post-mitotic neurons, it is heavily down-regulated in the majority of terminally differentiated neurons, indicating a regulatory role in delaying axon outgrowth in newly formed neurons. Consistently, we show that Prox1 is sufficient to inhibit neurite extension in neuroblastoma cell lines. Furthermore, shRNA-mediated knock-down of Prox1 in Neuro2A cells induces the extension of neurites. More importantly, Prox1 overexpression suppresses axon elongation in primary neuronal cultures as well as in the developing mouse brain, while Prox1 knock-down promotes axon outgrowth. Mechanistically, RNA-Seq analysis reveals that Prox1 affects critical pathways for neuronal maturation and neurite extension. Interestingly, Prox1 strongly inhibits many components of Ca2+ signaling pathway, an important mediator of axon extension and neuronal maturation. In accordance, Prox1 represses Ca2+ entry upon KCl-mediated depolarization and reduce CREB phosphorylation. These observations suggest that Prox1 acts as a potent suppressor of axon elongation by inhibiting Ca2+ signaling pathway. This action may provide the appropriate time window for nascent neurons to find the correct position in the CNS prior to initiation of axon elongation.

2020-12-31 | GSE158904 | GEO

RNA-Sequencing of HDLEC treated with siRNA targeting PROX1 and TIE2

Project description:We analyzed genome-wide transcriptional changes induced by siPROX1 and siTIE2, using RNA-seq analysis of HDLECs in order to highlight the importance of Ang-Tie2 system in SC and lymphatic development. Here, we report that coordination between both Ang1- and Ang2-signaling via Tie2 and Prox1 activity are essential for the appropriate formation of SC during development and maintenance of SC integrity.

2017-09-01 | GSE83299 | GEO

Transcriptional profile changes by Prox1 expression in thyroid cancer cells

Project description:Human thyroid cancer cell line BCPAP was engineered for doxycyclin-mediated inducible expressoin of Prox1 and next generation sequcing was performed to study the transcriptional regulation by Prox1 BCPAP cells were infected with rTTA2 lentivirus. The resulting cell populations were then stably transfected either with pIRES-hygromycin vector (Clontech) to generate BCPAP-Ctr cells, or with Flag-PROX1-IRES-hygromycin vector to generate BCPAP-Prx cells. PROX1 expression was induced or not in BCPAP-Ctr and BCPAP-Prx cells with 0.5 Âµg/ml doxycycline (Dox) for 48 hours and the total RNA samples were collected for sequencing.

2016-03-02 | E-GEOD-75059 | biostudies-arrayexpress

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