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Epigenome analysis of NNMT KO versus WT cells

ABSTRACT: Epigenome analysis of NNMT KO versus WT cells

PROVIDER: PRJNA754404 | ENA |

REPOSITORIES: ENA

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Epigenome analysis of NNMT KO versus WT cells

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Project description:The cellular heterogeneity within a tumor can be determined by core genetic and epigenetic programs that operate in certain cells (tumor initiating cells – TICs), providing them with the degree of plasticity needed for induction of metastasis and resistance to therapy. Here we show that the metabolic enzyme nicotinamide N-methyl transferase (NNMT) promotes TIC plasticity in Estrogen Receptor (ER) alpha negative breast cancer. NNMT downregulation delays tumor formation and its full depletion impairs metastasis formation in mice. Mechanistically, NNMT loss increases deposition of H3K9-me2/3 and H3K27-me3 at the promoter of genes involved in stem cell regulation, shutting down their expression and upregulating luminal differentiation genes. This study reveals a major function of NNMT in maintaining core epigenetic programmes that promote TIC self-renewal and metastasis and that repress luminal differentiation.

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Label-free quantitative proteomics analysis of bone marrow cells of MK-LCM WT versus KO mice

Project description:High ploidy large cytoplasmic megakaryocytes (LCM) are critical negative regulators of hematopoietic stem cells (HSC) and are responsible for platelet formation. Using a mouse knockout model with normal megakaryocyte numbers but essentially devoid of LCM (MK-LCM KO), we demonstrated a pronounced increase in bone marrow HSC concurrent with endogenous mobilization and extramedullary hematopoiesis. When HSC isolated from a MK-LCM KO microenvironment were transplanted in lethally irradiated mice, the absence of LCM increased HSC in BM, blood and spleen. Severe thrombocytopenia was observed in animals with diminished LCM, although there was no change in megakaryocyte ploidy distribution. In contrast, WT HSC-generated LCM regulated a normal HSC pool and prevented thrombocytopenia. The present label-free quantitative LC-MSMS data was used to determine proteins that are differentially expressed in bone marrow cells of MK-LCM WT versus MK-LCM KO mice.

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