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Global role of IGF2BP1 in controlling the expression of Wnt/β-catenin-regulated genes [MEF_RNA-seq]

ABSTRACT: The purpose of this study was to determine how IGF2BP1 affects non-transformed and colorectal cancer (CRC) cells' expression of the genes regulated by Wnt/β-catenin signaling. The study established that while the majority of upregulated genes in non-transformed cells were activated by Wnt ligand treatment independent of IGF2BP1, a subset of Wnt-induced genes was regulated by IGF2BP1, including 11 direct binding targets. In contrast, in CRC cells where Wnt signaling is constitutively active, the majority of downregulated genes upon β-catenin/Tcf7l2 blockage were regulated by IGF2BP1, and 17 of these genes were identified as direct binding targets of IGF2BP1. Our iCLIP study identified a shift in the binding regions along target transcriptomes with modulations in Wnt signaling. Furthermore, the study found a significant change in the enrichment of 6-mer motifs associated with IGF2BP1 binding in response to Wnt signaling in both cell types, suggesting a role for Wnt signaling in regulating IGF2BP1 binding specificity. The study also revealed a signature of IGF2BP1-regulated genes that are significantly associated with colon cancer-free survival in humans, as well as potential targets for colon cancer treatment, including MGAT5 and MET. Overall, this study highlights the complex and context-dependent regulation of Wnt signaling target genes by IGF2BP1 in non-transformed and CRC cells and identifies potential targets for colon cancer treatment.

ORGANISM(S): Mus musculus

PROVIDER: GSE237688 | GEO | 2023/09/19

REPOSITORIES: GEO

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Global role of IGF2BP1 in controlling the expression of Wnt/β-catenin-regulated genes II

Project description:The purpose of this study was to determine how IGF2BP1 affects non-transformed and colorectal cancer (CRC) cells' expression of the genes regulated by Wnt/β-catenin signaling. The study established that while the majority of upregulated genes in non-transformed cells were activated by Wnt ligand treatment independent of IGF2BP1, a subset of Wnt-induced genes was regulated by IGF2BP1, including 11 direct binding targets. In contrast, in CRC cells where Wnt signaling is constitutively active, the majority of downregulated genes upon β-catenin/Tcf7l2 blockage were regulated by IGF2BP1, and 17 of these genes were identified as direct binding targets of IGF2BP1. Our iCLIP study identified a shift in the binding regions along target transcriptomes with modulations in Wnt signaling. Furthermore, the study found a significant change in the enrichment of 6-mer motifs associated with IGF2BP1 binding in response to Wnt signaling in both cell types, suggesting a role for Wnt signaling in regulating IGF2BP1 binding specificity. The study also revealed a signature of IGF2BP1-regulated genes that are significantly associated with colon cancer-free survival in humans, as well as potential targets for colon cancer treatment, including MGAT5 and MET. Overall, this study highlights the complex and context-dependent regulation of Wnt signaling target genes by IGF2BP1 in non-transformed and CRC cells and identifies potential targets for colon cancer treatment.

2023-09-19 | GSE237664 | GEO

Global role of IGF2BP1 in controlling the expression of Wnt/β-catenin-regulated genes I

2023-09-19 | GSE237658 | GEO

Global role of IGF2BP1 in controlling the expression of Wnt/β-catenin-regulated genes [G109_DLD1_RNA-seq]

2023-09-19 | GSE237687 | GEO

The transcription factor GATA6 allows self-renewal of colon adenoma stem cells by repressing BMP gene expression.

Project description:Aberrant activation of WNT signaling and loss of BMP signals represent the two main alterations leading to the initiation of colorectal cancer (CRC). Here we screen for genes required for maintaining the tumor stem cell phenotype and identify the zinc-finger transcription factor GATA6 as key regulator of the WNT and BMP pathways in CRC. GATA6 directly drives the expression of LGR5 in adenoma stem cells while it restricts BMP signaling to differentiated tumor cells. Genetic deletion of Gata6 in mouse colon adenomas increases the levels of BMP factors, which signal to block self-renewal of tumor stem cells. In human tumors, GATA6 represses BMP4 gene expression through binding to a regulatory region that has been previously linked to increased susceptibility to develop CRC. Thus, GATA6 creates a permissive environment for tumor stem cell expansion by controlling the major signaling pathways that influence CRC initiation. Total RNA from biological replicates of VillinCreERT2Gata6+/+Apcfl/fl and VillinCreERT2Gata6fl/flApcfl/fl colon adenoma tumor organoids grown for one week in control media (see growth protocol).Total RNA was extracted using the TRIzolM-BM-. Plus RNA Purification Kit (Life Technologies).

2014-06-19 | E-GEOD-49479 | biostudies-arrayexpress

Apc restoration promotes cellular differentiation and reestablishes crypt homeostasis in colorectal cancer

Project description:The Adenomatous Polyposis Coli (APC) tumor suppressor is mutated in the vast majority of human colorectal cancers (CRC) and leads to deregulated Wnt signaling. To determine whether Apc disruption is required for tumor maintenance, we developed a mouse model of CRC whereby Apc can be conditionally suppressed using a doxycycline-regulated shRNA. Apc suppression produces adenomas in both the small intestine and colon that, in the presence of Kras and p53 mutations, can progress to invasive carcinoma. In established tumors, Apc restoration drives rapid and widespread tumor-cell differentiation and sustained regression without relapse. Tumor regression is accompanied by the re-establishment of normal crypt-villus homeostasis, such that once aberrantly proliferating cells reacquire self-renewal and multi-lineage differentiation capability. Our study reveals that CRC cells can revert to functioning normal cells given appropriate signals, and provide compelling in vivo validation of the Wnt pathway as a therapeutic target for treatment of CRC Analysis of RNA isolated from colon polyps that presented in shAPC or shAPC/Kras mice as compared to shRenilla (neutral) mouse colon mucosa

2015-06-18 | E-GEOD-67186 | biostudies-arrayexpress

Nuclear DICKKOPF-1 as a biomarker of chemoresistance and poor clinical outcome in colorectal cancer

Project description:Sporadic colorectal cancer (CRC) insurgence and progression depend on the activation of Wnt/?-catenin signaling. Dickkopf (DKK)-1 is an extracellular inhibitor of Wnt/?-catenin signaling that also has undefined ?-catenin-independent actions. Here we report for the first time that a proportion of DKK-1 locates within the nucleus of healthy small intestine and colon mucosa, and of CRC cells at specific chromatin sites of active transcription. Moreover, we show that DKK-1 regulates several cancer-related genes including the cancer stem cell marker aldehyde dehydrogenase 1A1 (ALDH1A1) and Ral-binding protein 1-associated Eps domain-containing 2 (REPS2), which are involved in detoxification of chemotherapeutic agents. Nuclear DKK-1 expression is lost along CRC progression; however, it remains high in a subset (15%) of CRC patients (n = 699) and associates with decreased progression-free survival (PFS) after chemotherapy administration and overall survival (OS) [adjusted HR, 1.65; 95% confidence interval (CI), 1.23-2.21; P = 0.002)]. Overexpression of ALDH1A1 and REPS2 associates with nuclear DKK-1 expression in tumors and correlates with decreased OS (P = 0.001 and 0.014) and PFS. In summary, our findings demonstrate a novel location of DKK-1 within the cell nucleus and support a role of nuclear DKK-1 as a predictive biomarker of chemoresistance in colorectal cancer. Analysis of DKK-1 location and associated roles in human colon cancer cells and crypts of small and large bowel.

2015-05-13 | E-GEOD-31170 | biostudies-arrayexpress

The transcription factor GATA6 allows self-renewal of colon adenoma stem cells by repressing BMP gene expression.

2014-06-19 | GSE49479 | GEO

Identification of beta-cetenin/TCF4 target genes in LS174T colorectal cancer cells using gene expression arrays

Project description:Aberrant activation of WNT signaling and loss of BMP signals represent the two main alterations leading to the initiation of colorectal cancer (CRC). Here we screen for genes required for maintaining the tumor stem cell phenotype and identify the zinc-finger transcription factor GATA6 as key regulator of the WNT and BMP pathways in CRC. GATA6 directly drives the expression of LGR5 in adenoma stem cells while it restricts BMP signaling to differentiated tumor cells. Genetic deletion of Gata6 in mouse colon adenomas increases the levels of BMP factors, which signal to block self-renewal of tumor stem cells. In human tumors, GATA6 competes with beta-catenin/TCF4 for binding to a distal regulatory region of the BMP4 locus that has been previously linked to increased susceptibility to develop CRC. Hence, GATA6 creates a permissive environment for tumor stem cell expansion by controlling the major signaling pathways that influence CRC initiation.

2014-05-20 | GSE56896 | GEO

Identification of GATA6 target genes in LS174T colorectal cancer cells using gene expression arrays

Project description:Aberrant activation of WNT signaling and loss of BMP signals represent the two main alterations leading to the initiation of colorectal cancer (CRC). Here we screen for genes required for maintaining the tumor stem cell phenotype and identify the zinc-finger transcription factor GATA6 as key regulator of the WNT and BMP pathways in CRC. GATA6 directly drives the expression of LGR5 in adenoma stem cells while it restricts BMP signaling to differentiated tumor cells. Genetic deletion of Gata6 in mouse colon adenomas increases the levels of BMP factors, which signal to block self-renewal of tumor stem cells. In human tumors, GATA6 competes with beta-catenin/TCF4 for binding to a distal regulatory region of the BMP4 locus that has been previously linked to increased susceptibility to develop CRC. Hence, GATA6 creates a permissive environment for tumor stem cell expansion by controlling the major signaling pathways that influence CRC initiation.

2014-05-20 | GSE56895 | GEO

Next Generation Sequencing Analysis of colon transcriptomes in BF638R bsh- and bF638R bsh+ colonized Cdx2Apcf/w mice.

Project description:Bacteroides, that expresses bile salt hydrolase (BSH), is considered as a potential drug target for metabolic diseases. In the present study, BSH-expressing Bacteroides was found to be enriched in two different CRC mouse models and colonization of nonenterotoxigenic Bacteroides species, such as B. fragilis 9343 or B. vulgatus , enhanced CRC growth. Expression of the 9343 bsh gene in B. fragilis 638R, a bsh - lacking strain, enabled more bile acids to escape into the colon and accelerated CRC progression . The presence of BSH activated WNT signaling and upregulated CCL28 expression dependent on b-catenin in colon tumors. The activated b-catenin/CCL28 axis elevated intra-tumororal immunosuppressive CD25+ FOXP3+ T reg cells. Anti-CCL28 antibody reversed microbial BSH amplificationinduced immunosuppression. Inhibition of BSH reduced CRC progression, coincident with suppression of WNT signaling and CCL28 expression. These findings provide a novel insight into the pro-carcinogenetic role of NTBF in CRC and characterize BSH as a potential target for CRC treatment.

2022-12-17 | GSE190298 | GEO

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