bims-meprid Biomed News
on Metabolic-dependent epigenetic reprogramming in differentiation and disease
Issue of 2024–06–09
three papers selected by
Alessandro Carrer, Veneto Institute of Molecular Medicine
  1. Nuclear position and local acetyl-CoA production regulate chromatin state.
  2. Nucleotide metabolism in cancer cells fuels a UDP-driven macrophage cross-talk, promoting immunosuppression and immunotherapy resistance.
  3. Nucleotide depletion promotes cell fate transitions by inducing DNA replication stress.
  1. Nature. 2024 Jun 05.
    Nuclear position and local acetyl-CoA production regulate chromatin state.
    Philipp Willnow, Aurelio A Teleman.
      Histone acetylation regulates gene expression, cell function and cell fate1. Here we study the pattern of histone acetylation in the epithelial tissue of the Drosophila wing disc. H3K18ac, H4K8ac and total lysine acetylation are increased in the outer rim of the disc. This acetylation pattern is controlled by nuclear position, whereby nuclei continuously move from apical to basal locations within the epithelium and exhibit high levels of H3K18ac when they are in proximity to the tissue surface. These surface nuclei have increased levels of acetyl-CoA synthase, which generates the acetyl-CoA for histone acetylation. The carbon source for histone acetylation in the rim is fatty acid β-oxidation, which is also increased in the rim. Inhibition of fatty acid β-oxidation causes H3K18ac levels to decrease in the genomic proximity of genes involved in disc development. In summary, there is a physical mark of the outer rim of the wing and other imaginal epithelia in Drosophila that affects gene expression.
    DOI:  https://doi.org/10.1038/s41586-024-07471-4
  2. Nat Cancer. 2024 Jun 06.
    Nucleotide metabolism in cancer cells fuels a UDP-driven macrophage cross-talk, promoting immunosuppression and immunotherapy resistance.
    Tommaso Scolaro, Marta Manco, Mathieu Pecqueux, Ricardo Amorim, Rosa Trotta, Heleen H Van Acker, Matthias Van Haele, Niranjan Shirgaonkar, Stefan Naulaerts, Jan Daniluk, Fran Prenen, Chiara Varamo, Donatella Ponti, Ginevra Doglioni, Ana Margarida Ferreira Campos, Juan Fernandez Garcia, Silvia Radenkovic, Pegah Rouhi, Aleksandar Beatovic, Liwei Wang, Yu Wang, Amalia Tzoumpa, Asier Antoranz, Ara Sargsian, Mario Di Matteo, Emanuele Berardi, Jermaine Goveia, Bart Ghesquière, Tania Roskams, Stefaan Soenen, Thomas Voets, Bella Manshian, Sarah-Maria Fendt, Peter Carmeliet, Abhishek D Garg, Ramanuj DasGupta, Baki Topal, Massimiliano Mazzone.
      Many individuals with cancer are resistant to immunotherapies. Here, we identify the gene encoding the pyrimidine salvage pathway enzyme cytidine deaminase (CDA) among the top upregulated metabolic genes in several immunotherapy-resistant tumors. We show that CDA in cancer cells contributes to the uridine diphosphate (UDP) pool. Extracellular UDP hijacks immunosuppressive tumor-associated macrophages (TAMs) through its receptor P2Y6. Pharmacologic or genetic inhibition of CDA in cancer cells (or P2Y6 in TAMs) disrupts TAM-mediated immunosuppression, promoting cytotoxic T cell entry and susceptibility to anti-programmed cell death protein 1 (anti-PD-1) treatment in resistant pancreatic ductal adenocarcinoma (PDAC) and melanoma models. Conversely, CDA overexpression in CDA-depleted PDACs or anti-PD-1-responsive colorectal tumors or systemic UDP administration (re)establishes resistance. In individuals with PDAC, high CDA levels in cancer cells correlate with increased TAMs, lower cytotoxic T cells and possibly anti-PD-1 resistance. In a pan-cancer single-cell atlas, CDAhigh cancer cells match with T cell cytotoxicity dysfunction and P2RY6high TAMs. Overall, we suggest CDA and P2Y6 as potential targets for cancer immunotherapy.
    DOI:  https://doi.org/10.1038/s43018-024-00771-8
  3. Dev Cell. 2024 May 30. pii: S1534-5807(24)00327-7. [Epub ahead of print]
    Nucleotide depletion promotes cell fate transitions by inducing DNA replication stress.
    Brian T Do, Peggy P Hsu, Sidney Y Vermeulen, Zhishan Wang, Taghreed Hirz, Keene L Abbott, Najihah Aziz, Joseph M Replogle, Stefan Bjelosevic, Jonathan Paolino, Samantha A Nelson, Samuel Block, Alicia M Darnell, Raphael Ferreira, Hanyu Zhang, Jelena Milosevic, Daniel R Schmidt, Christopher Chidley, Isaac S Harris, Jonathan S Weissman, Yana Pikman, Kimberly Stegmaier, Sihem Cheloufi, Xiaofeng A Su, David B Sykes, Matthew G Vander Heiden.
      Control of cellular identity requires coordination of developmental programs with environmental factors such as nutrient availability, suggesting that perturbing metabolism can alter cell state. Here, we find that nucleotide depletion and DNA replication stress drive differentiation in human and murine normal and transformed hematopoietic systems, including patient-derived acute myeloid leukemia (AML) xenografts. These cell state transitions begin during S phase and are independent of ATR/ATM checkpoint signaling, double-stranded DNA break formation, and changes in cell cycle length. In systems where differentiation is blocked by oncogenic transcription factor expression, replication stress activates primed regulatory loci and induces lineage-appropriate maturation genes despite the persistence of progenitor programs. Altering the baseline cell state by manipulating transcription factor expression causes replication stress to induce genes specific for alternative lineages. The ability of replication stress to selectively activate primed maturation programs across different contexts suggests a general mechanism by which changes in metabolism can promote lineage-appropriate cell state transitions.
    Keywords:  cancer; cell fate; cell state; dependencies; differentiation; epigenetics; hematopoiesis; metabolism; nucleotides; replication; replication stress
    DOI:  https://doi.org/10.1016/j.devcel.2024.05.010
This page is being maintained by Thomas Krichel. It was last updated on 2024‒11‒22 at 4:20.