MUC1-C ACTIVATES THE NURD COMPLEX IN DEDIFFERENTIATION OF TRIPLE-NEGATIVE BREASTCANCER CELLS
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA554094 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR9670710.fastq.gz | Fastqsanger.gz | |||
| SRR9670711.fastq.gz | Fastqsanger.gz | |||
| SRR9670702.fastq.gz | Fastqsanger.gz | |||
| SRR9670712.fastq.gz | Fastqsanger.gz | |||
| SRR9670703.fastq.gz | Fastqsanger.gz |
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Project description:The NuRD chromatin remodeling and deacetylation complex, which includes MTA1, MBD3, CHD4 and HDAC1 among other components, is of importance for development and cancer progression. The oncogenic MUC1-C protein activates EZH2 and BMI1 in the epigenetic reprogramming of triple-negative breast cancer (TNBC) cells. However, there is no known link between MUC1-C and chromatin remodeling complexes. The present studies demonstrate that MUC1-C binds directly to the MYC HLH/LZ domain. In turn, we identified a previously unrecognized MUC1-C®MYC pathway that regulates the NuRD complex. We show that MUC1-C/MYC complexes selectively activate the MTA1 and MBD3 genes and posttranscriptionally induce CHD4 expression in basal- and not luminal-type BC cells. The results further show that MUC1-C forms complexes with these NuRD components on the ESR1 promoter. In this way, silencing MUC1-C (i) decreased MTA1/MBD3/CHD4/HDAC1 occupancy and increased H3K27 acetylation on the ESR1 promoter, and (ii) induced ESR1 expression and downstream estrogen response pathways. We also demonstrate that targeting MUC1-C and these NuRD components induces expression of FOXA1, GATA3 and other markers associated with the luminal phenotype. These findings and results from gain-of-function studies support a model in which MUC1-C activates the NuRD complex in driving luminal®basal dedifferentiation and plasticity of TNBC cells.
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Project description:The NuRD chromatin remodeling and deacetylation complex, which includes MTA1, MBD3, CHD4, and HDAC1 among other components, is of importance for development and cancer progression. The oncogenic mucin 1 (MUC1) C-terminal subunit (MUC1-C) protein activates EZH2 and BMI1 in the epigenetic reprogramming of triple-negative breast cancer (TNBC). However, there is no known link between MUC1-C and chromatin remodeling complexes. Here, we showed that MUC1-C binds directly to the MYC HLH-LZ domain and identified a previously unrecognized MUC1-C→MYC pathway that regulates the NuRD complex. MUC1-C/MYC complexes selectively activated the MTA1 and MBD3 genes and posttranscriptionally induced CHD4 expression in basal- but not luminal-type BC cells. In turn, MUC1-C formed complexes with these NuRD components on the ESR1 promoter. Downregulating MUC1-C decreased MTA1/MBD3/CHD4/HDAC1 occupancy and increased H3K27 acetylation on the ESR1 promoter, with induction of ESR1 expression and downstream estrogen response pathways. Targeting MUC1-C and these NuRD components also induced expression of FOXA1, GATA3, and other markers associated with the luminal phenotype. These findings support a model in which MUC1-C activates the NuRD complex to drive dedifferentiation and reprogramming of TNBC cells. SIGNIFICANCE: MUC1-C directly interacts with MYC to activate the NuRD complex, mediating regulation of the estrogen receptor in triple-negative breast cancer cells.
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Project description:The cancer stem cell (CSC) state is intimately associated with suppression of the immune tumor microenvironment (TME). The oncogenic MUC1-C protein drives dedifferentiation of castrate resistant prostate cancer (CRPC) CSCs in association with induction of the BAF, NuRD and PBAF chromatin remodeling complexes. The present work demonstrates that MUC1-C is necessary for expression of IFNGR1 and activation of the type II interferon-gamma (IFN- pathway in CRPC cells. We show that the MUC1-CARID1A/BAF pathway induces IFNGR1 transcription and that MUC1-CNuRD signaling suppresses FBXW7 in stabilizing the IFNGR1 protein. MUC1-C and NuRD were also necessary for expression of the downstream STAT1 and IRF1 transcription factors. Additionally and in contrast, our results demonstrate that MUC1-C and the PBRM1/PBAF pathway are necessary for IRF1-induced expression of (i) IDO1, WARS and PTGES, which metabolically suppress the immune TME, and (ii) the ISG15 and SERPINB9 inhibitors of T cell function. Of translational relevance, we show that MUC1 associates with expression of IFNGR1, STAT1 and IRF1, as well as the downstream IDO1, WARS, PTGES, ISG15 and SERPINB9 immunosuppressive effectors in CRPC tumors. Consistent with these results, MUC1 associates with immune cell-depleted “cold” CRPC TMEs. These findings demonstrate that MUC1-C integrates chronic activation of the type II IFN-G pathway with induction of chromatin remodeling complexes in linking CSC dedifferentiation and immune evasion.
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Project description:STAT1 and IRF1 are essential effectors of the type I and II interferon (IFN) pathways. Here, we report that the oncogenic MUC1-C protein is necessary for inducing chromatin accessibility and activation of the STAT1 and IRF1 genes in triple-negative breast cancer (TNBC) cells. Our results demonstrate that MUC1-C activates the PBRM1 subunit of the SWI/SNF PBAF chromatin remodeling complex and forms a nuclear complex with PBRM1. We show that MUC1-C associates with PBRM1 and STAT1 on the IRF1 gene at (i) a proximal enhancer-like signature (PLS), and (ii) distal enhancer-like signatures (dELSs). We also show MUC1-C and PBRM1 are necessary for opening chromatin at these signatures and for the induction of IRF1 expression. In extending these results, we found that MUC1-C binds directly to IRF1 and forms nuclear complexes with PBRM1 and IRF1, which are necessary for inducing chromatin accessibility at PLS of the (i) STAT1 gene, (ii) type II IFN pathway IDO1 and WARS genes, and (iii) type I IFN pathway RIG-I, MDA5 and ISG15 genes. Consistent with involvement of chronic inflammation in promoting the cancer stem cell (CSC) state, we show that MUC1-C, PBRM1 and IRF1 are required for self-renewal of TNBC CSCs. Of translational relevance, we report that targeting MUC1-C, PBRM1 and IRF1 circumvents intrinsic DNA damage resistance of TNBC CSCs and that MUC1-C is necessary for acquired resistance to the PARP inhibitor olaparib. These findings demonstrate that MUC1-C activates PBRM1/IRF1 and thereby chromatin remodeling of IFN pathway genes that promote chronic inflammation, the CSC state and DNA damage resistance.
2023-06-14 | GSE212587 | GEO
Project description:STAT1 and IRF1 are essential effectors of the type I and II interferon (IFN) pathways. Here, we report that the oncogenic MUC1-C protein is necessary for inducing chromatin accessibility and activation of the STAT1 and IRF1 genes in triple-negative breast cancer (TNBC) cells. Our results demonstrate that MUC1-C activates the PBRM1 subunit of the SWI/SNF PBAF chromatin remodeling complex and forms a nuclear complex with PBRM1. We show that MUC1-C associates with PBRM1 and STAT1 on the IRF1 gene at (i) a proximal enhancer-like signature (pELS), and (ii) distal enhancer-like signatures (dELSs). We also show MUC1-C and PBRM1 are necessary for opening chromatin at these signatures and for the induction of IRF1 expression. In extending these results, we found that MUC1-C binds directly to IRF1 and forms nuclear complexes with PBRM1 and IRF1, which are necessary for inducing chromatin accessibility at pELSs of the (i) STAT1 gene, (ii) type II IFN pathway IDO1 and WARS genes, and (iii) type I IFN pathway RIG-I, MDA5 and ISG15 genes. Consistent with involvement of chronic inflammation in promoting the cancer stem cell (CSC) state, we show that MUC1-C, PBRM1 and IRF1 are required for self-renewal of TNBC CSCs. Of translational relevance, we report that targeting MUC1-C, PBRM1 and IRF1 circumvents intrinsic DNA damage resistance of TNBC CSCs and that MUC1-C is necessary for acquired resistance to the PARP inhibitor olaparib. These findings demonstrate that MUC1-C activates PBRM1 and thereby chromatin remodeling of IFN pathway genes that promote chronic inflammation, the CSC state and DNA damage resistance.
2022-06-21 | GSE206212 | GEO
Project description:STAT1 and IRF1 are essential effectors of the type I and II interferon (IFN) pathways. Here, we report that the oncogenic MUC1-C protein is necessary for inducing chromatin accessibility and activation of the STAT1 and IRF1 genes in triple-negative breast cancer (TNBC) cells. Our results demonstrate that MUC1-C activates the PBRM1 subunit of the SWI/SNF PBAF chromatin remodeling complex and forms a nuclear complex with PBRM1. We show that MUC1-C associates with PBRM1 and STAT1 on the IRF1 gene at (i) a proximal enhancer-like signature (PLS), and (ii) distal enhancer-like signatures (dELSs). We also show MUC1-C and PBRM1 are necessary for opening chromatin at these signatures and for the induction of IRF1 expression. In extending these results, we found that MUC1-C binds directly to IRF1 and forms nuclear complexes with PBRM1 and IRF1, which are necessary for inducing chromatin accessibility at PLS of the (i) STAT1 gene, (ii) type II IFN pathway IDO1 and WARS genes, and (iii) type I IFN pathway RIG-I, MDA5 and ISG15 genes. Consistent with involvement of chronic inflammation in promoting the cancer stem cell (CSC) state, we show that MUC1-C, PBRM1 and IRF1 are required for self-renewal of TNBC CSCs. Of translational relevance, we report that targeting MUC1-C, PBRM1 and IRF1 circumvents intrinsic DNA damage resistance of TNBC CSCs and that MUC1-C is necessary for acquired resistance to the PARP inhibitor olaparib. These findings demonstrate that MUC1-C activates PBRM1/IRF1 and thereby chromatin remodeling of IFN pathway genes that promote chronic inflammation, the CSC state and DNA damage resistance.
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Project description:MUC1-C activates the COMPASS SET1A/WDR5 complex in integrating the induction of genes that promote chronic inflammation, pluripotency and the cancer stem cell state
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Project description:The MUC1-C protein evolved in mammals for adaptation of barrier tissues to loss of homeostasis. Prolonged activation of MUC1-C in settings of chronic inflammation promotes lineage plasticity, epigenetic reprogramming and the cancer stem cell (CSC) state. The effects of MUC1-C on the metabolism of CSCs remain unexplored. The present studies performed on purified populations of triple-negative breast cancer (TNBC) CSCs demonstrate that MUC1-C integrates the capacity for self-renewal with the activation of aerobic glycolysis. We show that MUC1-C is essential for (i) CSC mammosphere formation and tumorigenicity and (ii) activation of GLUT1, HK2 and other glycolytic genes. We further show that MUC1-C activates nuclear genes that encode components of mitochondrial Complexes II-V of the electron transfer chain (ETC). Of importance, MUC1-C also represses mitochondrial DNA (mtDNA) genes encoding components of Complexes I-V. The observed involvement of MUC1-C in the suppression of mtDNA genes is explained by MUC1-C-mediated (i) downregulation of the mitochondrial transcription factor A (TFAM), which is required for mtDNA transcription, and (ii) induction of the mitochondrial transcription termination factor 3 (mTERF3). In support of this pathway to suppress mitochondrial ROS production, targeting MUC1-C increases (i) mtDNA gene transcription, (ii) superoxide levels and (iii) loss of self-renewal capacity. These findings indicate that MUC1-C regulates CSC self-renewal and redox balance by integrating activation of glycolysis with suppression of oxidative phosphorylation.
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Project description:MUC1-C subunit plays an essential role in regulating NEAT1 expression. MUC1-C activates the NEAT1 gene with induction of the NEAT1_1 and NEAT1_2 isoforms by NF-kB- and MYC-mediated mechanisms. MUC1-C/MYC signaling also induces expression of the SFPQ, NONO and FUS RNA binding proteins (RBPs) that associate with NEAT1_2 and are necessary for paraspeckle formation.
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