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α-Ketoglutarate attenuates Wnt signaling and drives differentiation in colorectal cancer [RNA-seq III]

ABSTRACT: Genetic-driven deregulation of the Wnt pathway is crucial but not sufficient for colorectal cancer (CRC) tumourigenesis. Here, we show that environmental glutamine restriction further augments Wnt signaling in APC mutant intestinal organoids to promote stemness and leads to adenocarcinoma formation in vivo via decreasing intracellular alpha-ketoglutarate (aKG) levels. aKG supplementation is sufficient to rescue low-glutamine induced stemness and Wnt hyperactivation. Mechanistically, we found that aKG promotes hypomethylation of DNA and histone H3K4me3, leading to an upregulation of differentiation-associated genes and downregulation of Wnt target genes, respectively. Using CRC patient-derived organoids and several in vivo CRC tumour models, we show that aKG supplementation suppresses Wnt signaling and promotes cellular differentiation, thereby significantly restricting tumour growth and extending survival. Together, our results reveal how the low glutamine metabolic microenvironment impacts Wnt signaling and identify aKG as a potent antineoplastic metabolite for potential differentiation therapy for CRC patients.

ORGANISM(S): Mus musculus

PROVIDER: GSE140269 | GEO | 2020/03/23

REPOSITORIES: GEO

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Project description:Regeneration capacity of intestinal epithelial cells are highly dependent on the status of stemness. In the homeostasis, only a small subset of stem cells is responsible for the turnover of the intestinal epithelium. However, at the injury, such as caused by radiation, intestinal epithelial cells show substantial plasticity for regeneration. Most of the colorectal cancers (CRCs) are differentiated adenocarcinoma, which maintain the expression of both stemness and differentiation markers, suggesting an existence of a similar regeneration system as in normal cells, although the role of such fluctuation of stemness in regeneration of cancer after irradiation is not well understood. In the present study, we first examined the effect of radiation on growth, stemness and differentiation using organoids derived from differentiated CRC. Both proliferation and stemness markers were once drastically decreased after sub-lethal dose of irradiation, meanwhile differentiation markers remained. After the static phase, regrowth foci consisting of proliferating cells with expression of the stem cell markers reappeared. We applied the foci formation to a radio-sensitivity assay in CRC organoids. Radio-sensitivity, the ability of foci formation, differed among the examined lines, and correlated well with the in vivo radiation sensitivity. The radio-sensitivity decreased after mechanical disruption of the organoids, which we have reported to increase the stemness of CRC organoids in a WNT dependent manner. Pre-treatment of organoids with histone deacetylase inhibitors increased radiation sensitivity, accompanied with suppressed expression of WNT target genes, and WNT inhibitors increased radio-sensitivity, suggesting that not all but some of the cancer cells with high WNT activity at the timing of radiation is the origin of the foci formation. The radiation sensitivity assay using CRC organoids established in the present study would provide a novel platform to evaluate the radiosensitizers against differentiated adenocarcinoma of CRC.

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α-Ketoglutarate attenuates Wnt signaling and drives differentiation in colorectal cancer [RNA-seq III]

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