Abstract
Acetate metabolism is an important metabolic pathway in many cancers and is controlled by acetyl-CoA synthetase 2 (ACSS2), an enzyme that catalyzes the conversion of acetate to acetyl-CoA. While the metabolic role of ACSS2 in cancer is well described, the consequences of blocking tumor acetate metabolism on the tumor microenvironment and antitumor immunity are unknown. We demonstrate that blocking ACSS2, switches cancer cells from acetate consumers to producers of acetate thereby freeing acetate for tumor-infiltrating lymphocytes to use as a fuel source. We show that acetate supplementation metabolically bolsters T-cell effector functions and proliferation. Targeting ACSS2 with CRISPR-Cas9 guides or a small-molecule inhibitor promotes an antitumor immune response and enhances the efficacy of chemotherapy in preclinical breast cancer models. We propose a paradigm for targeting acetate metabolism in cancer in which inhibition of ACSS2 dually acts to impair tumor cell metabolism and potentiate antitumor immunity.
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Data availability
RNA-seq data that support the findings of this study have been deposited in the Gene Expression Omnibus under accession code GSE202281. Metabolomic data are available at the NIH Common Fund’s National Metabolomics Data Repository website, the Metabolomics Workbench, https://www.metabolomicsworkbench.org where it has been assigned study ID ST002740. The data can be accessed directly via its project at https://doi.org/10.21228/M89T4G. This work is supported by NIH grant U2C-DK119886. Source data for all figures and extended data have been provided as Source Data files. Previously published human breast tissue scRNA-seq data that were re-analyzed here for expression of ACSS1 and ACSS2 mRNA are available under accession code GSE164898 (refs. 40,41). Previously published human primary breast tumor scRNA-seq data that were re-analyzed here for expression for ACSS1 mRNA are available from GSE176078 (ref. 36). Source data are provided with this paper.
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Acknowledgements
We thank H.-Y. Tang, N. Gorman, A. Goldman and T. Beer of the Wistar Institute Proteomic and Metabolomic core. We also acknowledge the staff of the Wistar Institute Genomics Core, Wistar Flow Cytometry Core and Wistar Animal Facility. The authors thank E. Cento, Z. Chen, M.A. Eldabbas and E. Maddox of the Human Immunology Core (HIC) and the Division of Transfusion Medicine and Therapeutic Pathology at the Perelman School of Medicine at the University of Pennsylvania for providing de-identified, T cells, B cells, monocytes and NK cells that were purified from healthy donor apheresis using StemCell RosetteSep kits. HIC RRID, SCR_022380. This work was supported by grants from the National Institutes of Health (NIH) National Cancer Institute (NCI) DP2 CA249950-01 (Z.T.S.), NIH NCI P01 CA114046 (Z.T.S.), NIH R21 CA259240-01 (R.S.S.), the W.W. Smith Charitable Trust (Z.T.S.), Susan G. Komen CCR19608782 (Z.T.S.) and the V Foundation for Cancer Research (Z.T.S.). This research and project is funded, in part, by a contract with the Pennsylvania Breast Cancer Coalition (Z.T.S.). The PBCC takes no part in and is in no way responsible for any analyses, interpretations or conclusions contained herein. We acknowledge funding from the NIH NCI T32 CA009171 (K.D.M. and S.H.) and the American Cancer Society Rena and Victor Damone Postdoctoral Fellowship PF-20-1225-01-CCG (K.D.M.). The Wistar Molecular Screening Facility and Genomics Facility are supported by NIH grant P30 CA010815. The Wistar Proteomic and Metabolomic Facility is supported, in part, by NIH grants R50 CA221838 and S10 OD023586. The HIC is supported, in part, by NIH P30 AI045008 and P30 CA016520.
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K.D.M. and Z.T.S. conceived and planned the experiments. K.D.M. and Z.T.S. interpreted and prepared the data presented in this manuscript. K.D.M., S.O.C., K.A.P., S.P., S.H., K.N.S., F.B., S.Z., K.E.W. and S.H. assisted in the execution and interpretation of experiments. M.H. generated revertant cell lines. Y.V.V.S. and J.M.S. generated and validated VY-3-135. T.K. and A.K. assisted in the analysis, interpretation and generation of figures related to transcriptomics. D.M. optimized the metabolomics method and analyzed LC–MS data. K.D.M. and Z.T.S. prepared the figures and initial drafts of this manuscript. R.A., F.B. and D.T.C. performed proliferation and polyfunctional assays. G.M. and R.S.S. performed phenotypic marker flow cytometry profiling. All authors revised and approved the final version of this manuscript.
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J.M.S. and Z.T.S. are scientific co-founders and consultants for Syndeavor Therapeutics. The remaining authors declare no competing interests.
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Extended data
Extended Data Fig. 1 Knockout of Acss2 in mouse breast cancer cell lines often leads to tumor clearance.
a, LC-MS analysis of 13C2-acetate labeling of metabolites and fatty acids in T12 tumor tissue from vehicle versus VY-3-135 treated BALB/c mice. Lines represent the mean ± standard deviation (SD). P values were generated using two-sided t-test. n = 5 tumours per group. AU = arbitrary units b, Allograft tumour growth of Cas9 (WT) or sgAcss2 (Acss2-KO) A7C11 cells in C57Bl/6 mice. Adjusted p values were generated using two-tailed multiple unpaired Welch t-test. Values represent the mean tumour volume ± SEM. n = 5 mice per group. c, Western blots for ACSS2 expression in T11 and 4T1 sgAcss2 cell lines. d, Allograft tumour growth of Cas9 (WT) or sgAcss2 (Acss2-KO) T11 cells in BALB/c mice. n = 8 mice per group. e, Kaplan-Meier survival plot of C57Bl/6 tumour-bearing mice injected with either wild type (Cas9) or Acss2-KO (sgAcss2) T11 cells. P values were generated using a log-rank (Mantel-Cox) test. n = 16 mice per group. f, Allograft tumour growth of Cas9 (WT) or sgAcss2 (Acss2-KO) 4T1 cells in BALB/c mice. Adjusted p values were generated using multiple two-sided Welch t-test. Values represent the mean tumour volume ± SEM. n = 8 mice per group. g, Syngeneic allograft tumour growth of 4T1 sgAcss2 revertant (sgAcss2 rev) tumours in BALB/c mice. n = 7 to 8 mice per group as indicated on plot. Take rates indicate the number of mice with tumours in each group at the end of the study. h, i, Kaplan-Meier survival plot of C57Bl/6 tumour-bearing mice injected with either wild type (Cas9) or Acss2-KO (sgAcss2) Brpkp110 cells or with wild type (Cas9) Brpkp110 cells that were treated daily from day 4 to day 31 (marked red triangles) with VY-3-135. P values were generated using a log-rank (Mantel-Cox) test. n = 8 mice per group. j, Western blot for ACSS2 expression in Brpkp110 wild type (Cas9 #1), sgAcss2 and sgAcss2 rev. k, Syngeneic allograft tumour growth of Brpkp110 cells from panel j in C57Bl/6 mice. n = 5 mice per group. Western blotting results were independently validated twice.
Extended Data Fig. 2 Clearance of Acss2-KO tumours depends on the presence of functional T cells.
a, Representative flow plots of peripheral blood mononuclear cells collected from mice depleted of CD4+, CD8+, or CD4+ and CD8+ T cells. b, Final tumour weights of WT or Acss2-KO Brpkp110 tumours grown in C57Bl/6, C57Bl/6 Rag2−/−, or NSG mice. Values represent the mean tumour volume ± SD. P values generated using two-tailed Mann–Whitney U test. c, d, Representative flow plots of peripheral blood mononuclear cells collected from mice treated with IgG control (c) or an NK-cell depleting antibody against NK1.1 (d).
Extended Data Fig. 3 ACSS2 inhibitor-treated tumours have gene signatures associated with increased immune surveillance and activation.
a, Volcano plots showing differentially expressed genes (DEGs) in tumours from NSG or C57Bl/6 mice treated with VY-3-135. NSG tumour-bearing mice were treated for 15 days. C57Bl/6 mice were treated for 5 days. b, Venn diagram illustrating the overlap of genes differentially regulated by VY-3-135 treatment in tumours grown in NSG versus C57Bl/6 mice. c, Heat map of 64 genes in common from the data in panel a. d, e, GSEA of the top 20 most significantly activated functions in tumours after VY-3-135 treatment in NSG and C57Bl/6 mice. Heat-mapping represents -log10 FDR values. The number of genes within that function that were altered is displayed. The x-axis shows the predicted Z score based on the gene expression differences. f, g, IPA analysis of the top 20 significant regulators enriched by VY-3-135 treatment in NSG or C57Bl/6 mice. Heat-mapping on bar plots represents -log10 FDR values. The number next to the bar displays the number (N) of genes within that regulator or function gene set that were altered. The x-axis is the predicted Z score based on the gene expression differences.
Extended Data Fig. 4 Single cell RNA sequencing identifies enhanced activation of tumour-infiltrating myeloid cells after ACSS2 inhibition.
a, Seurat plot of cell populations following subclustering of myeloid cells from clusters 3 and 4 from Fig. 5a. b, Heat map illustrating gene expression of the top five most highly expressed gene markers within each subcluster. c, Heat-mapping of gene marker expression onto the myeloid cell subclusters. d, Volcano plot illustrating DEGs in VY-3-135 treated tumours of subcluster 0. P values were generated with a nonparametric Wilcoxon rank-sum test. e, GSEA of the top 20 functions and regulators in subcluster 0 that were significantly activated in VY-3-135 treated tumours. f, Volcano plot illustrating DEGs in subcluster 1 in VY-3-135 treated tumours. P values were generated with a nonparametric Wilcoxon rank-sum test. g, GSEA of the top 20 functions and regulators in subcluster 1 that were significantly activated in VY-3-135 treated tumours. Heat-mapping on bar plots represents -log10 FDR values. The number next to the bar displays the number (N) of genes within that regulator or function gene set that were altered. The x-axis is the predicted Z score based on the gene expression differences.
Extended Data Fig. 5 Gene markers used to identify the cell types within the subclusters of T cells and NK cells.
a, b, Heat-mapping of the relative expression of canonical genes used to distinguish T cells and NK cells within all five lymphocyte subclusters from Fig. 5d. c, Predicted distribution of NK, NKT, and Treg cells within the subclusters.
Extended Data Fig. 6 Lymphocytes express relatively high amounts of ACSS1 and oxidize acetate better than macrophages.
a, Representative dot plots displaying enrichment for CD8+ and CD4+ T cells from total splenocytes collected from mice. b, mRNA expression for macrophage markers of polarization. Data are presented as relative expression normalized to BMDM. n = 1 quantitation of mRNA expression. c, ACSS1 mRNA expression in T cells and macrophages. Data are presented as a mean ± SD. P values generated using two-way ANOVA Dunnett’s multiple comparisons test against CD8+ T cells. n.s. = not significant. n = 3 independent samples for T cells and n = 6 independent samples for macrophages. d, Stable isotope tracing of 0.1 versus 0.5 mM 13C2-acetate into T cells and macrophages for 1 h and LC-MS based analysis of citrate labeling. M + 2, M + 3, and M + 4 plots show the percent labeling of citrate by 13C2-acetate for each isotopologue. n = 2 independent cultures of CD8+ T cells and macrophages.
Extended Data Fig. 7 Acetate increases expression of cytokines and activation markers in T cells cultured in low glucose.
a, ACSS1, ACSS2 and ACSS3 expression in lymphocytes and monocytes from one male and one female healthy human donor. b, ACSS1 mRNA expression represented as normalized transcripts per kilobase million (nTPM) from a scRNA-seq analysis of normal human breast tissue. Where n ≥ 3 data are presented as a mean ± SEM. c, ACSS1 mRNA expression from a scRNA-seq analysis of human breast tumors. Violin plots with hashed lines representing median and dotted lines mark upper and lower quartiles. P values generated using log-rank test. d, Expression of degranulation and activation markers in human CD8+ T cells after stimulation in the presence of increasing concentrations of acetate and two different concentrations of glucose. Dotted lines represent expression levels in standard culture medium. n = 2 independent CD8+ T-cell cultures. Data are presented as a percent of total CD8+ T cells. e, Glucose and acetate consumption by human CD8+ T cells during polyfunctional assay. Data are expressed as change in concentration during overnight stimulation. n.d. = not detected. n = 2 independent CD8+ T-cell cultures. Western blotting results were independently validated at least twice.
Supplementary information
Supplementary Table 1
Spearman correlation of ACSS1 and ACSS2 expression with immune infiltrate gene signatures.
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Miller, K.D., O’Connor, S., Pniewski, K.A. et al. Acetate acts as a metabolic immunomodulator by bolstering T-cell effector function and potentiating antitumor immunity in breast cancer. Nat Cancer 4, 1491–1507 (2023). https://doi.org/10.1038/s43018-023-00636-6
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DOI: https://doi.org/10.1038/s43018-023-00636-6
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