Homo sapiens
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA339979 | ENA |
REPOSITORIES: ENA
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Project description:ARID1A is frequently mutated in ovarian clear-cell carcinoma (OCCC) and often co-exists with activating mutations of PIK3CA. Although induction of pro-inflammatory cytokines has been observed in this cancer, the mechanism by which the two mutations synergistically activate cytokine genes remains elusive. Here we established an in vitro model of OCCC by introducing ARID1A knock-down and mutant PIK3CA in a normal human ovarian epithelial cell line, which resulted in cell transformation and cytokine gene induction. We demonstrate that loss of ARID1A impairs the recruitment of the Sin3A-HDAC complex, while PIK3CA mutation releases RelA from IkB, leading to cytokine gene activation. We show that an NF-kB inhibitor partly attenuates proliferation of OCCC and improves the efficacy of carboplatin both in cell culture and a mouse model. Our study thus reveals the mechanistic link between ARID1A/PIK3CA mutations and cytokine gene induction in OCCC, and suggests NF-kB inhibition can be a potential therapeutic option.
2016-09-15 | GSE86004 | GEO
Project description:Chronic inflammation and immunosuppressive microenvironment promote prostate cancer (PCa) metastasis and diminish the responses to immune checkpoint blockade (ICB) therapies. However, it remains unclear how and to what extent these two events are coordinated. Here we show that ARID1A, a subunit of the SWI/SNF chromatin remodeling complex, functions downstream of inflammation induced IKKb activation to shape immunosuppressive tumor microenvironment (TME). Prostate-specific deletion of Arid1a cooperates with Pten loss to produce a metastasis-prone tumors. We identify that polymorphonuclear myeloid-derived suppressor cells (MDSCs) as the major infiltrating immune cell type to cause immune evasion, and neutralization of MDSCs restricts metastasis of Arid1a deficient tumors. Mechanistically, inflammation cues activate IKKβ to phosphorylate ARID1A, leading to its degradation via b-TRCP. ARID1A downregulation in turn silences the enhancer of A20 deubiquitinase, a critical negative regulator of NF-kB signaling, and thereby unleashing CXCR2 ligands-mediated MDSC chemotaxis. Importantly, our results support the therapeutic strategy of anti-NF-kB or CXCR2 combined with ICB for advanced PCa. Together, our findings highlight a critical role of ARID1A in MDSCs recruitment and demonstrate IKKb/ARID1A/NF-kB feedback axis integrating inflammation and the immunosuppression to drive PCa metastasis.
2022-11-07 | GSE197687 | GEO
Project description:Chronic inflammation and immunosuppressive microenvironment promote prostate cancer (PCa) metastasis and diminish the responses to immune checkpoint blockade (ICB) therapies. However, it remains unclear how and to what extent these two events are coordinated. Here we show that ARID1A, a subunit of the SWI/SNF chromatin remodeling complex, functions downstream of inflammation induced IKKb activation to shape immunosuppressive tumor microenvironment (TME). Prostate-specific deletion of Arid1a cooperates with Pten loss to produce a metastasis-prone tumors. We identify that polymorphonuclear myeloid-derived suppressor cells (MDSCs) as the major infiltrating immune cell type to cause immune evasion, and neutralization of MDSCs restricts metastasis of Arid1a deficient tumors. Mechanistically, inflammation cues activate IKKβ to phosphorylate ARID1A, leading to its degradation via b-TRCP. ARID1A downregulation in turn silences the enhancer of A20 deubiquitinase, a critical negative regulator of NF-kB signaling, and thereby unleashing CXCR2 ligands-mediated MDSC chemotaxis. Importantly, our results support the therapeutic strategy of anti-NF-kB or CXCR2 combined with ICB for advanced PCa. Together, our findings highlight a critical role of ARID1A in MDSCs recruitment and demonstrate IKKb/ARID1A/NF-kB feedback axis integrating inflammation and the immunosuppression to drive PCa metastasis.
2022-11-07 | GSE197686 | GEO
Project description:Chronic inflammation and immunosuppressive microenvironment promote prostate cancer (PCa) metastasis and diminish the responses to immune checkpoint blockade (ICB) therapies. However, it remains unclear how and to what extent these two events are coordinated. Here we show that ARID1A, a subunit of the SWI/SNF chromatin remodeling complex, functions downstream of inflammation induced IKKb activation to shape immunosuppressive tumor microenvironment (TME). Prostate-specific deletion of Arid1a cooperates with Pten loss to produce a metastasis-prone tumors. We identify that polymorphonuclear myeloid-derived suppressor cells (MDSCs) as the major infiltrating immune cell type to cause immune evasion, and neutralization of MDSCs restricts metastasis of Arid1a deficient tumors. Mechanistically, inflammation cues activate IKKβ to phosphorylate ARID1A, leading to its degradation via b-TRCP. ARID1A downregulation in turn silences the enhancer of A20 deubiquitinase, a critical negative regulator of NF-kB signaling, and thereby unleashing CXCR2 ligands-mediated MDSC chemotaxis. Importantly, our results support the therapeutic strategy of anti-NF-kB or CXCR2 combined with ICB for advanced PCa. Together, our findings highlight a critical role of ARID1A in MDSCs recruitment and demonstrate IKKb/ARID1A/NF-kB feedback axis integrating inflammation and the immunosuppression to drive PCa metastasis.
2022-11-07 | GSE213251 | GEO
Project description:Chronic inflammation and immunosuppressive microenvironment promote prostate cancer (PCa) metastasis and diminish the responses to immune checkpoint blockade (ICB) therapies. However, it remains unclear how and to what extent these two events are coordinated. Here we show that ARID1A, a subunit of the SWI/SNF chromatin remodeling complex, functions downstream of inflammation induced IKKb activation to shape immunosuppressive tumor microenvironment (TME). Prostate-specific deletion of Arid1a cooperates with Pten loss to produce a metastasis-prone tumors. We identify that polymorphonuclear myeloid-derived suppressor cells (MDSCs) as the major infiltrating immune cell type to cause immune evasion, and neutralization of MDSCs restricts metastasis of Arid1a deficient tumors. Mechanistically, inflammation cues activate IKKβ to phosphorylate ARID1A, leading to its degradation via b-TRCP. ARID1A downregulation in turn silences the enhancer of A20 deubiquitinase, a critical negative regulator of NF-kB signaling, and thereby unleashing CXCR2 ligands-mediated MDSC chemotaxis. Importantly, our results support the therapeutic strategy of anti-NF-kB or CXCR2 combined with ICB for advanced PCa. Together, our findings highlight a critical role of ARID1A in MDSCs recruitment and demonstrate IKKb/ARID1A/NF-kB feedback axis integrating inflammation and the immunosuppression to drive PCa metastasis.
2022-11-07 | GSE197749 | GEO
Project description:While growth factor-independent signaling and proliferation are well-established hallmarks of cancer, little is known regarding growth factor-independent changes in gene expression which occur downstream from oncogenes. The PI3K pathway is one of the most commonly misregulated signaling pathways in human cancers. Here, MCF10A cells expressing the two most common PI3K mutations, PIK3CA E545K and H1047R, were used to identify the repertoire of genes altered by oncogenic PI3K mutations following growth factor deprivation. This gene set most closely correlated with gene signatures from claudin-low and basal-like breast tumors, and categorical enrichment analyses suggested that NF-kB target genes were dramatically upregulated by these mutations. An IKKb inhibitor was used to identify the subset of PI3K-driven genes that is NF-kB dependent. Interestingly, virtually all of these NF-kB dependent genes were secreted proteins, suggesting a paracrine role for this gene set. Among these genes was IL-6, a cytokine frequently expressed in tumors which plays a critical role in generating a tumor-promoting microenvironment. Consistent with this, conditioned media from cells expressing the E545K or H1047R mutations led to increased STAT3 activation in recipient THP-1 monocytes or normal epithelial cells in a NF-kB and IL-6-dependent manner. Together, these data describe a PI3K-driven, NF-kB-dependent gene expression profile which may play a critical role in promoting a microenvironment amenable to tumor progression. 39 normal cell lines vs treated cell lines for micorarray analysis
2012-04-30 | E-GEOD-33403 | biostudies-arrayexpress
Project description:The cancer stem cells (CSCs) have important therapeutic implications for multi-resistant cancers including hepatocellular carcinoma (HCC). Among the key pathways frequently activated in liver CSCs is NF-kB signaling. Here we evaluated the CSCs-depleting potential of NF-kB inhibition in liver cancer achieved by IKK inhibitor curcumin and specific peptide SN50 . The effects on CSCs were assessed by analysis of Side Population (SP) and expression levels of CSC-related genes as determined by RT-qPCR, gene expression microarray, EMSA, and Western blotting. Curcumin caused anti-proliferative and pro-apoptotic responses directly related to the extent of NF-kB inhibition. In curcumin-sensitive tumor cells, the treatment led to a selective CSC depletion as evidenced by a reduced SP size, decreased sphere formation, down-regulation of CSC markers and suppressed tumorigenicity. Similarly, NF-kB inhibition by SN50 caused a general suppression of cell growth accompanied by a reduced SP fraction. In contrast, curcumin-resistant cells exhibited a paradoxical increase in proliferation and expression of CSC markers. Mechanistically, CSC-depleting activity of curcumin was exerted by the NF-kB-mediated HDAC inhibition causing down-regulation of c-MYC and other key oncogenic targets. Co-administration of the class I/II HDAC inhibitor trichostatine sensitized resistant cells to curcumin. Further, integration of a predictive signature of curcumin sensitity with our HCC database indicated that HCC patients with poor prognosis and progenitor features are most likely to benefit from NF-kB inhibition. These results demonstrate that NF-kB inhibition can specifically target CSC populations and suggest a potential for combined inhibition of NF-kB and HDAC signaling for treatment of liver cancer patients with poor prognosis. Five human hepatoma cell lines with and without curcumin
2015-12-31 | E-GEOD-59713 | biostudies-arrayexpress
Project description:Ovarian clear cell carcinoma (OCCC) is an aggressive form of ovarian cancer with high ARID1A mutation rates. Here we present a genetically engineered mouse model of OCCC. We find that ARID1A inactivation is not sufficient for tumor formation, but requires concurrent activation of the phosphoinositide 3-kinase catalytic subunit, PIK3CA. Remarkably, the mice develop highly penetrant tumors with OCCC-like histopathology, culminating in hemorrhagic ascites and a median survival period of 7.5 weeks. Therapeutic treatment with the pan-PI3K inhibitor, BKM120, prolonged mouse survival by inhibiting tumor cell growth. Cross-species gene expression comparisons support a role for IL-6 inflammatory cytokine signaling in OCCC pathogenesis. We further show that ARID1A-PIK3CA mutations cooperate to promote tumor growth through sustained IL-6 overproduction. Our findings establish an epistatic relationship between SWI/SNF chromatin remodeling and PI3K pathway mutations in OCCC and demonstrate that these pathways converge on pro-tumorigenic cytokine signaling. We propose that ARID1A protects against inflammation-driven tumorigenesis.
2014-12-31 | GSE57380 | GEO
Project description:ARID1A, a subunit of the canonical BAF nucleosome remodeling complex, is commonly mutated in lymphomas. Our study shows that ARID1A orchestrates B-cell fate during the germinal center (GC) response, facilitating cooperative and sequential binding of PU.1 and NF-kB at crucial genes for cytokine and CD signaling. The absence of ARID1A tilts GC cell-fate towards immature IgM+CD80-PDL2- memory B-cells, known for their potential to re-enter new GCs. When combined with BCL2 oncogene, ARID1A haploinsufficiency hastens the progression of aggressive follicular lymphomas in mice. Remarkably, follicular lymphoma patients with ARID1A-inactivating mutations preferentially display an immature memory B-cell-like state with increased transformation risk to aggressive disease. These observations offer mechanistic understanding into the emergence of both indolent and aggressive lymphomas in ARID1A-mutant patients through formation of immature memory-like clonal precursors. Lastly, we demonstrate that ARID1A mutation induces synthetic lethality to SMARCA2/4 inhibition, paving the way for potential precision therapy for high-risk patients.
2024-02-02 | GSE254595 | GEO
Project description:ARID1A, a subunit of the canonical BAF nucleosome remodeling complex, is commonly mutated in lymphomas. Our study shows that ARID1A orchestrates B-cell fate during the germinal center (GC) response, facilitating cooperative and sequential binding of PU.1 and NF-kB at crucial genes for cytokine and CD signaling. The absence of ARID1A tilts GC cell-fate towards immature IgM+CD80-PDL2- memory B-cells, known for their potential to re-enter new GCs. When combined with BCL2 oncogene, ARID1A haploinsufficiency hastens the progression of aggressive follicular lymphomas in mice. Remarkably, follicular lymphoma patients with ARID1A-inactivating mutations preferentially display an immature memory B-cell-like state with increased transformation risk to aggressive disease. These observations offer mechanistic understanding into the emergence of both indolent and aggressive lymphomas in ARID1A-mutant patients through formation of immature memory-like clonal precursors. Lastly, we demonstrate that ARID1A mutation induces synthetic lethality to SMARCA2/4 inhibition, paving the way for potential precision therapy for high-risk patients.
2024-02-02 | GSE254594 | GEO