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Dickkopf-2 regulates stemness and differentiation of colorectal cancer cells via c-Src and HNF4α1

ABSTRACT: Dickkopf-2 regulates stemness and differentiation of colorectal cancer cells via c-Src and HNF4α1

PROVIDER: PRJNA662322 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR12607458.fastq.gz	Fastqsanger.gz
	SRR12607459.fastq.gz	Fastqsanger.gz

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Dickkopf-2 regulates stemness and differentiation of colorectal cancer cells via c-Src and HNF4α1

Project description:Metastasis is the leading cause of cancer-related mortality. Cancer stem cells contribute to metastasis in the murine colon cancer models, but the underlying mechanisms are unclear. Here we report a Wnt ligand, Dickkopf2 (DKK2) is essential for colorectal cancer stemness. Genetic depletion of Dkk2 in intestinal epithelial or stem cells reduced tumorigenesis as well as expression of the stem cell marker gene Lgr5 in a model of colitis-associated cancer. Mechanistically, DKK2 activates c-Src followed by increased LGR5 expressing stem cells in colorectal cancer through degradation of HNF4α1. Splenic injection of DKK2-deficient cancer organoids into C57BL/6 mice resulted in a significant reduction of liver metastases compared to the control cancer organoids in spite of the presence of oncogenic mutations in Apc, Kras and Tp53 genes. These findings suggest that DKK2 is required for stemness of colorectal cancer cells, which in turn contributes to metastasis.

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Src modulates its oncogenic signaling via regulation of miRNA-129-3p [microRNA]

Project description:To address the molecular mechanisms underlying c-Src-induced cell transformation, we previously developed a model system using Csk-deficient fibroblasts that can be transformed by wild-type c-Src. In this study, we applied this system for the analysis of the potential contribution of mRNA and miRNA to c-Src-induced cell transformation. We found miR-129-3p was downregulated in c-Src-induced cell transformation in a Dox-inducible expression system via c-Src, c-Yes, and Fer.

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Src modulates its oncogenic signaling via regulation of miRNA-129-3p [mRNA]

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FIBP maintains colorectal cancer cells stemness via demethylation of stemness genes

Project description:To validate how FIBP influences stemness, we obtained the genome-wide methylation in HCT116-CSCs by an Illumina HumanMethylation450 BeadChip.

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SETD5 regulates the OGT-catalyzed O-GlcNAcylation of RNA polymerase II, which is involved in the stemness of colorectal cancer cells

Project description:The dosage-dependent recruitment of RNA polymerase II (Pol II) at the promoters of genes related to neurodevelopment and stem cell maintenance is required for transcription by the fine-tuned expression of SET-domain-containing protein 5 (SETD5). Pol II O-GlcNAcylation by O-GlcNAc transferase (OGT) is critical for preinitiation complex formation and transcription cycling. SETD5 dysregulation has been linked to stem cell-like properties in some cancer types; however, the role of SETD5 in cancer cell stemness has not yet been determined. We here show that aberrant SETD5 overexpression induces stemness in colorectal cancer (CRC) cells. SETD5 overexpression causes the upregulation of PI3K-AKT pathway-related genes and cancer stem cell (CSC) markers such as CD133, Kruppel-like factor 4 (KLF4), and estrogen-related receptor beta (ESRRB), leading to the gain of stem cell-like phenotypes. Our findings also revealed a functional relationship between SETD5, OGT, and Pol II. OGT-catalyzed Pol II glycosylation depends on SETD5, and the SETD5-Pol II interaction weakens in OGT-depleted cells, suggesting a SETD5-OGT-Pol II interdependence. SETD5 deficiency reduces Pol II occupancy at PI3K-AKT pathway-related genes and CD133 promoters, suggesting a role for SETD5-mediated Pol II recruitment in gene regulation. Moreover, the SETD5 depletion nullified the SETD5-induced stemness of CRC cells and Pol II O-GlcNAcylation. These findings support the hypothesis that SETD5 mediates OGT-catalyzed O-GlcNAcylation of RNA Pol II, which is involved in cancer cell stemness gain via CSC marker gene upregulation.

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