Abstract
Genetic-driven deregulation of the Wnt pathway is crucial but not sufficient for colorectal cancer (CRC) tumorigenesis. 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 α-ketoglutarate (αKG) levels. αKG supplementation is sufficient to rescue low-glutamine-induced stemness and Wnt hyperactivation. Mechanistically, we found that αKG promotes hypomethylation of DNA and histone H3K4me3, leading to an upregulation of differentiation-associated genes and downregulation of Wnt target genes, respectively. Using organoids derived from patients with CRC and several in vivo CRC tumor models, we show that αKG supplementation suppresses Wnt signaling and promotes cellular differentiation, thereby significantly restricting tumor growth and extending survival. Together, our results reveal how the metabolic microenvironment impacts Wnt signaling and identify αKG as a potent antineoplastic metabolite for potential differentiation therapy for patients with CRC.
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Data availability
DNA sequencing and RNA-Seq data that support the findings of this study have been deposited in the Gene Expression Omnibus under accession code GSE140270. SuperSeries GSE140270 is composed of the following SubSeries: GSE140263, GSE140264, GSE140265, GSE140266, GSE140267 and GSE140269. Metabolomics raw data are included in Supplementary Table 5. Source data for Figs. 1–3 and 5–7 and Extended Data Figs. 1–7 are provided with the paper. All other data supporting the findings of this study are available from the corresponding author upon reasonable request.
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Acknowledgements
We thank members of the Kong laboratory and the Waterman laboratory, as well as E. J. Stanbridge, for helpful comments on the manuscript. We thank D. T. Florina for assistance with the animal experiments, and the L. Dow Laboratory (Weill Cornell) for the AKP organoids. This research was supported by funds from the NIH (R01CA183989 and R01GM132142 to M.K.; R01CA17765 to M.L.W. and R.A.E.; and U54CA217378 to M.L.W.) and American Cancer Society (grant number RSG-16-085-01-TBE to M.K.). E.A.H. is supported by the American Cancer Society (PFDDC-132846). A.N.H. is supported by NSF grant DGE‐1321846 and NIH grant T32CA009054. Research reported here includes work carried out in Core Facilities at the University of California Irvine, supported by the NIH under grant number P30CA062203.
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T.Q.T. conceived of the project, designed and performed the majority of the experiments and wrote the manuscript. M.K. conceived of the project, supervised the study, designed the experiments and wrote the manuscript. E.A.H. performed the ChIP experiments, metabolite measurements and animal studies and contributed to manuscript preparation. A.N.H. provided materials, performed the PDO culture experiments and contributed to manuscript preparation. H.L. performed the bioinformatic analyses. M.B.I.G. and Y.Y. assisted with the animal studies. X.H.L. and A.M.O. assisted with qPCR and sample preparation. S.Y.L. provided clinical samples for the PDOs. R.A.E. assisted with the pathological analysis. M.L.W. provided conceptual advice on the experimental design and assisted with manuscript preparation.
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Extended data
Extended Data Fig. 1 The effect of glutamine starvation on ApcMin/+ and wildtype organoids.
a, Relative glutamine uptake in ApcMin/+ organoids and wildtype organoids (n=3 biologically independent samples) and relative glutamine uptake in AKP organoids upon doxycycline addition (n=4 biologically independent samples). b, Percentage of cystic organoid in ApcMin/+ organoids upon glutamine deprivation (0.2 mM and 0.4 mM) overtime (n=7 biologically independent cultures). c, Percentage of cystic organoids and organoid number of ApcMin/+ organoids treated with CB-839 for 1 week (n=3 biologically independent cultures). d, Percentage of wildtype organoids with cystic morphology after 4 passages in low glutamine conditon (n=6 biologically independent cultures). e, qPCR analysis of Axin2 in wildtype organoids cultured in control or low glutamine medium for 1 week. Data from n=3 independent experiments with a line marking the mean value. (f,g) Control and glutamine-starved wildtype organoids were dissociated into single cells, and equal number of organoid-derived cells were cultured in organoid medium with 3 mM or 0.3 mM glutamine (low gln). Secondary organoid formation and percentage of cystic organoids are shown (n=9 biologically independent cultures). Data in a-e,g represent means ± SD, p values were determined by two-tailed unpaired Student’s t-test. Scale bars, 1000 μm (c,d,f). Source data are provided for a-e,g.
Extended Data Fig. 2 Genetic alterations do not contribute to low-glutamine induced stemness.
a, Identified genetic alterations in glutamine-starved ApcMin/+ organoids compared to paired control organoids as determined by exome sequencing. b, Brightfield images of control and glutamine-starved ApcMin/+organoids after 12 passages. Results are representative of three biologically independent cultures. c, Immunoblotting for full length and truncated Apc protein in control and glutamine starved ApcMin/+ organoids after 8 passages. Results are representative of three independent experiments. d, Representative images and percentage of cells with full-length Apc protein based on immunofluorescent staining with C-terminus Apc antibody in wildtype organoids, tumour organoids derived from adenomas derived in ApcMin/+ mice, and ApcMin/+organoids from healthy tissues in control medium and upon glutamine deprivation (n=4 biologically independent cultures), data represent means ± SD. (e,f) Representative images and percentage of shApc /KrasG12D/p53fl/fl (AKP) organoid with crypts cultured in control or low glutamine medium for 10 days (n=5 biologically independent cultures). g, qPCR analysis of Krt20 and Lgr5 in a similar experiment described in e after 3 days of glutamine deprivation. Data from n=2 independent experiments with a line marking the mean value. h, Hierarchical clustering of significant differentiated gene expression of ApcMin/+ organoids cultured in control or low-glutamine medium (n=3 biologically independent samples). i, qPCR analysis of the indicated genes in SW620 colon cancer cells (n=3 technical replicates and data represent means) cultured in medium with the indicated glutamine concentration for 3 days. A single experiment is shown that is representative of two independent experiments with similar results. Scale bars, 200 µm (b), 400 μm (d,e). Unprocessed blot images for c and source data for d,f,g,i are provided.
Extended Data Fig. 3 The role of aKG in low-glutamine induced stemness.
a, Schematic diagram of glutamine metabolism. b, Relative metabolite levels as measured by LC-MS in ApcMin/+ organoids cultured in control and low glutamine medium (n=4 biologically independent samples). c, Relative aKG levels in intestinal tumours from ApcMin/+ mice and normal intestinal tissues of wildtype mice (n=5 mice per group). Data in b,c represent means ± SD, and p values were determined by two-tailed unpaired Student’s t-test. (d,e) Relative intracellular aKG and succinate levels in ApcMin/+ organoids upon DM-aKG (n=5 biologically independent samples) or DM-succinate supplementation (n=6 biologically independent samples). f, Immunofluorescent staining for ROS in ApcMin/+ organoids under low glutamine or low glutamine medium supplemented with NAC. Results are representative from three biologically independent samples. g, Control organoids, glutamine-starved organoids treated with or without 3.5 mM DM-aKG were dissociated into single cells. An equal number of organoid-derived cells were cultured, and secondary organoid formation (n=6 biologically independent cultures) and cell proliferation (n=3 biologically independent cultures) were measured after 1 week and are shown. p values were determined by two-tailed unpaired Student’s t-test. h, Immunoblotting for Lgr5 and (i) qPCR analysis for Axin2 expression in ApcMin/+ organoid cultured in control and low glutamine medium with or without DM-aKG (n= 2 independent experiments with a line marking the mean value). Box plots in d,e,g show the maximum, third quartile, median, first quartile and minimum values, and the p values were determined by two-tailed unpaired Student’s t-test. Scale bar, 400 μm f, 1000 μm g. Unprocessed blot images for h and source data for b-e and g,i are provided.
Extended Data Fig. 4 The effect of aKG and glutamine supplementation on intestinal differentiation.
a, Representative brightfield images and immunofluorescent staining of the differentiation marker Krt20 in ApcMin/+ organoids treated with 3 mM DM-aKG for 3 days. Results are representative of three independent experiments. b, Representative images and relative organoid number of control ApcMin/+ organoid or glutamine-starved ApcMin/+ organoids upon 2 mM DM-aKG treatment or 6mM glutamine addition for 1 week (n=3 biologically independent cultures). Data represent means ± SD, and the p values were determined by two-tailed unpaired Student’s t-test. c, Overlapping gene expression profile of ApcMin/+ organoids cultured in low glutamine medium or treated with aKG reveals opposing regulation on Wnt target genes and intestinal differentiation related genes. Scale bars, 1000 μm (Brightfield), 200 μm (Immunofluorescence). Source data are provided for b.
Extended Data Fig. 5 aKG promotes hypomethylation of histone and DNA in CRC cells.
a, qPCR analysis of Axin2 in control and glutamine-starved organoids treated with 1 μM decitabine for 3 days. Data from n=2 independent experiments with a line marking the mean value. (b,c) Dot blot analysis of 5meC levels in ApcMin/+ organoids in control and low glutamine medium and SW620 cells in control, low glutamine medium or low glutamine medium supplemented with 8mM DM-aKG. Results are representative from two independent experiments. d, Heatmap of the differential methylated regions (different methylated ratio >±20%) in SW620 cells upon 8 mM DM-aKG treatment for 3 days. Beta value of the methylation ratio are shown (n=2 biologically independent samples). e, qPCR analysis of Dkk4 in ApcMin/+ organoids treated with 3.5 mM DM-aKG or 1 μM decitabine (n=3 technical replicates). A repeat experiment showed similar results. f, Dot blot analysis of 5meC levels in SW620 cells treated with DM-aKG (left), MeDIP experiment with 5meC antibody for DKK4 promoter in SW620 cells upon 8 mM DM-aKG treatment (right). Data show means ± SD of n=4 technical replicates. Results are representative of two independent experiments. g, qPCR analysis of TET1 expression in SW620 cells transfected with control siRNA or TET1 siRNA (data show means of n=3 technical replicates). h, qPCR analysis of DKK4 and LGR5 expression in control SW620 cells or TET1 siRNA knockdown cells following DM-aKG treatment. Data from n=2 independent experiments with a line marking the mean value. i, Representative immunoblot of histone methylation in SW620 cells treated with DM-aKG from two independent experiments. j, ChIP analysis of H3K4 levels on promoter regions of AXIN2 and MYC in SW620 cells in response to 8mM DM-aKG treatment for 3 days (n=4 technical replicates). k, Representative immunoblot of H3K4me3 in SW620 cells in control, low-glutamine medium or low glutamine medium supplemented with 8 mM DM-aKG from two independent experiments. l, ChIP analysis of H3K4me3 levels on promoter regions of AXIN2 and MYC in SW620 cells in response to glutamine starvation after 1 week (n=4 technical replicates). Results in j and l represent means ± SD and are representative of two independent experiments. Unprocessed blot images are provided for b,c,f, i and k. Source data are provided for a,e-h,j, and l.
Extended Data Fig. 6 DM-aKG treatment inhibits initiation and growth of PDOs.
a, Clinical information on PDOs used in the study. b, Immunoblot probed for Apc protein in different PDOs. c, Relative organoid size (n=50 organoids) and d, representative images of four biologically independent cultures of T23 PDO treated with 6 mM DM-aKG for 7 days, followed by metabolite wash-out and subsequent culture for 7 days. Data in c represent means ± SD. Scale bar, 400 μm (d). Unprocessed blot images for b and source data for c is provided.
Extended Data Fig. 7 The effect of DM-aKG treatment in mice.
a, Body weight and histological analysis of wildtype mice treated with 400 mg/kg DM-aKG via IP injection for more than 2 months (n=4 mice per group). b, Representative IHC staining for Cyclin D1 in intestinal tissues collected from ApcMin/+ mice treated with DM-aKG from three mice per group. c, Gene expression analysis from RNA sequencing performed on the intestinal tissues of wildtype mice (n=7 mice), ApcMin/+ mice (n=7 mice), and ApcMin/+ mice treated with DM-aKG (n=6 mice). d, Body weight changes and images of liver and spleen from ApcMin/+ mice treated with DM-aKG (n=5 mice per group). e, Liver and kidney function of wildtype mice treated with 15 mg/ml DM-aKG supplemented in drinking water for more than 4 months (n=5 mice per group). Data shown in a,d,e are means ± SD. The p values in e were determined by two-tailed unpaired Student’s t-test. Source data are provided for a,d,e.
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Tran, T.Q., Hanse, E.A., Habowski, A.N. et al. α-Ketoglutarate attenuates Wnt signaling and drives differentiation in colorectal cancer. Nat Cancer 1, 345–358 (2020). https://doi.org/10.1038/s43018-020-0035-5
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DOI: https://doi.org/10.1038/s43018-020-0035-5
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