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Early life microbiota exposure restricts myeloid-derived suppressor cell driven colonic tumorigenesis

ABSTRACT: Early life microbiota exposure restricts myeloid-derived suppressor cell driven colonic tumorigenesis

PROVIDER: PRJEB30607 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR3040150_1.fastq.gz	Fastqsanger.gz
	ERR3040150_2.fastq.gz	Fastqsanger.gz
	ERR3040160_1.fastq.gz	Fastqsanger.gz
	ERR3040160_2.fastq.gz	Fastqsanger.gz
	ERR3040151_1.fastq.gz	Fastqsanger.gz

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Early life microbiota exposure restricts myeloid-derived suppressor cell driven colonic tumorigenesis

Project description:Early life microbiota exposure restricts myeloid-derived suppressor cell driven colonic tumorigenesis

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Early-Life Microbiota Exposure Restricts Myeloid-Derived Suppressor Cell-Driven Colonic Tumorigenesis.

Project description:Gut microbiota and their metabolites are instrumental in regulating homeostasis at intestinal and extraintestinal sites. However, the complex effects of prenatal and early postnatal microbial exposure on adult health and disease outcomes remain incompletely understood. Here, we showed that mice raised under germ-free conditions until weaning and then transferred to specific pathogen-free (SPF) conditions harbored altered microbiota composition, augmented inflammatory cytokine and chemokine expression, and were hyper-susceptible to colitis-associated tumorigenesis later in adulthood. Increased number and size of colon tumors and intestinal epithelial cell proliferation in recolonized germ-free mice were associated with augmented intratumoral CXCL1, CXCL2, and CXCL5 expression and granulocytic myeloid-derived suppressor cell (G-MDSC) accumulation. Consistent with these findings, CXCR2 neutralization in recolonized germ-free mice completely reversed the exacerbated susceptibility to colitis-associated tumorigenesis. Collectively, our findings highlight a crucial role for early-life microbial exposure in establishing intestinal homeostasis that restrains colon cancer in adulthood.

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FOXO3 Deficiency in Neutrophils Drives Colonic Inflammation and Tumorigenesis

Project description:Inflammatory bowel disease (IBD), characterized by infiltration of polymorphonuclear neutrophils (PMNs), increases the risk of colon cancer. PMN activation corresponds to accumulation of their intracellular Lipid Droplets (LDs). As increased LDs are negatively regulated by transcription factor FOXO3, our aim is to determine the significance of this regulatory network in PMN-mediated IBD and tumorigenesis. Affected tissue of IBD and colon cancer patients, colonic and infiltrated immune cells, have increased LDs’ coat protein, PLIN2. Mouse peritoneal PMNs with increased LDs and FOXO3 deficiency have elevated transmigratory activity. Transcriptomic analysis of these FOXO3-deficient PMNs showed differentially expressed genes (DEGs; FDR < 0.05) involved in metabolism, inflammation, and tumorigenesis. Upstream regulators of these DEGs, similar to colonic inflammation and dysplasia in mice, were linked to IBD and human colon cancer. Additionally, a transcriptional signature representing FOXO3-deficient PMNs (PMN-FOXO3389) separated transcriptomes of affected tissue in IBD (p=0.00018) and colon cancer (p=0.0037) from control. PMN-FOXO3389 predicted colon cancer invasion (lymphovascular p= 0.015; vascular p= 0.046; perineural p=0.03), and poor survival. Validated DEGs from PMN-FOXO3389 (P2RX1, MGLL, MCAM, CDKN1A, RALBP1, CCPG1, PLA2G7) are involved in metabolism, inflammation, and tumorigenesis (p<0.05). These findings highlight the significance of LDs and FOXO3-mediated PMN functions that promote colonic pathobiology.

2023-06-05 | GSE234072 | GEO

FOXO3 Deficiency in Neutrophils Drives Colonic Inflammation and Tumorigenesis

Project description:FOXO3 Deficiency in Neutrophils Drives Colonic Inflammation and Tumorigenesis

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FOXO3 expression in macrophages is lowered by high fat diet and regulates colonic inflammation and tumorigenesis

Project description:Obesity, characterized by augmented inflammation and tumorigenesis, is linked to genetic predispositions, such as FOXO3 polymorphisms. As obesity is associated with aberrant macrophages infiltrating different tissue including the colon, we aimed to identify FOXO3-dependent transcriptomic changes in macrophages that drive obesity-mediated colonic inflammation and tumorigenesis. We found that in mouse colons, high-fat-diet-(HFD)-obesity led to diminished FOXO3 levels and increased macrophages. Transcriptomic analysis of mouse peritoneal FOXO3-deficient macrophages showed significant differentially expressed genes (DEGs; FDR<0.05) similar to HFD-obese colon. These DEGs related pathways, linked to mouse colonic inflammation and tumorigenesis, were similar to those in inflammatory bowel disease (IBD) and human colon cancer. Additionally, we identified a specific transcriptional signature for the macrophage-FOXO3 axis (MAC-FOXO382), which separated the transcriptome of affected tissue from control in both IBD (p=5.2E-08) and colon cancer (p=1.9E-11), revealing its significance in human colonic pathobiologies. Further, we identified (heatmap) and validated (qPCR) DEGs specific to FOXO3-deficient macrophages with established roles both in IBD and colon cancer (IL-1B, CXCR2, S100A8, S100A9, and TREM1) and those with unexamined roles in these colonic pathobiologies (STRA6, SERPINH1, LAMB1, NFE2L3, OLR1, DNAJC28 and VSIG10). These findings establish an important understanding of how HFD-obesity and related metabolites promote colonic pathobiologies.

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miR-204 blocks MYCN expression and is a novel a tumor suppressor in neuroblastoma tumorigenesis

Project description:Neuroblastoma is a pediatric cancer of the sympathetic nervous system. MYCN amplification is a key indicator of poor prognosis for the disease, however, mechanisms by which MYCN promotes neuroblastoma tumorigenesis are not fully understood. In this study, we analyzed global miRNA and mRNA expression profiles of tissues at different stages of tumorigenesis from TH-MYCN transgenic mice, a model of MYCN-driven neuroblastoma. Based on a Bayesian learning network model in which we compared pre-tumor ganglia from TH-MYCN+/+ mice to age-matched wild-type controls, we devised a predicted miRNA-mRNA interaction network. Among the miRNA-mRNA interactions operating during human neuroblastoma tumorigenesis, we identified that miR-204 is a tumor suppressor miRNA that inhibits a subnetwork of oncogenes strongly associated with MYCN-amplified neuroblastoma and poor patient outcome. Accordingly, we found that MYCN was bound to the miR-204 promoter and repressed miR-204 transcription, while in contrast, miR-204 directly bound MYCN mRNA and repressed MYCN expression. In support of a tumor suppressor role, miR-204 overexpression significantly inhibited neuroblastoma cell proliferation in vitro and tumorigenesis in vivo. Together these findings identify novel tumorigenic miRNA gene networks and miR-204 as a tumor suppressor that regulates MYCN expression in neuroblastoma tumorigenesis.

2018-06-01 | GSE100658 | GEO

BRG1 attenuates colonic inflammation and tumorigenesis through autophagy-dependent oxidative stress sequestration

Project description:BRG1 attenuates colonic inflammation and tumorigenesis through autophagy-dependent oxidative stress sequestration

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Inhibition of pluripotency networks by the Rb tumor suppressor restricts reprogramming and tumorigenesis.

Project description:Mutations in the retinoblastoma tumor suppressor gene Rb are involved in many forms of human cancer. In this study, we investigated the early consequences of inactivating Rb in the context of cellular reprogramming. We found that Rb inactivation promotes the reprogramming of differentiated cells to a pluripotent state. Unexpectedly, this effect is cell cycle independent, and instead reflects direct binding of Rb to pluripotency genes, including Sox2 and Oct4, which leads to a repressed chromatin state. More broadly, this regulation of pluripotency networks and Sox2 in particular is critical for the initiation of tumors upon loss of Rb in mice. These studies therefore identify Rb as a global transcriptional repressor of pluripotency networks, providing a molecular basis for previous reports about its involvement in cell fate pliability, and implicate misregulation of pluripotency factors such as Sox2 in tumorigenesis related to loss of Rb function.

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