RNA-seq in HT-29 colorectal cancer cells after F. nucleatum treatment
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ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE90944 | GEO | 2017/07/28
SECONDARY ACCESSION(S): PRJNA356417
REPOSITORIES: GEO
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Project description:Colorectal cancer HT-29 cell line is a comonly-used human cancer cell line. We have used this cell line for examining the effect of various anticancer compounds on gene expression and we obtained gene expression data of untreated HT-29 cells as a control data for the analysis.
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Project description:Fusobacterium nucleatum is a Gram-negative oncobacterium that is associated with colorectal cancer. The molecular mechanisms utilized by F. nucleatum to promote colorectal tumor development have largely focused on adhesin-mediated binding to the tumor tissue and on the pro-inflammatory capacity of F. nucleatum. However, the exact manner in which F. nucleatum promotes inflammation in the tumor microenvironment and subsequent tumor promotion remains underexplored. Here, we show that both live F. nucleatum and sterile F. nucleatum-conditioned medium promote CXCL8 release from the intestinal adenocarcinoma HT-29 cell line. We determined that the pro-inflammatory response was ALPK1-dependent in both HEK293 and HT-29 cells and that the released F. nucleatum molecule had characteristics that match those of the pro-inflammatory ALPK1 ligand ADP-heptose or related heptose phosphates. In addition, not only F. nucleatum but also other Fusobacterium species such as F. varium, F. necrophorum and F. gonidiaformans promoted an ALPK1-dependent pro-inflammatory environment, indicating that ADP-heptose or related heptose phosphates secretion is a conserved feature of the Fusobacterium genus. By performing transcriptional analysis of ADP-heptose stimulated HT-29 cells, we found several inflammatory and cancer-related pathways to be differentially regulated, including DNA mismatch repair genes and the immune inhibitory receptor PD-L1. Finally, we show that stimulation of HT-29 cells with F. nucleatum resulted in an ALPK1-dependent upregulation of PD-L1. These results aid in our understanding of the mechanisms by which F. nucleatum can affect tumor development and therapy and pave the way for future therapeutic approaches.
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Project description:The libraries contained in this experiment come from independent growths of cell line HT-29, a colorectal adenocarcinoma from a 44 year old female. They are stranded PE101 Illumina Hi-Seq libraries from rRNA-depleted Total RNA > 200 nucleotides in size. For data usage terms and conditions, please refer to http://www.genome.gov/27528022 and http://www.genome.gov/Pages/Research/ENCODE/ENCODE_Data_Use_Policy_for_External_Users_03-07-14.pdf
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Project description:The O-glycosyltransferase LARGE2 attaches a laminin-binding matriglycan structure on alpha-Dystroglycan (α-DG) to mediate the interaction of different cell types with their laminin-containing basement membrane. We used HT-29 CRC cells, characterized by low endogenous LARGE2 gene expression, to ectopically express LARGE2 and to drive O glycosylation of its protein substrates. Immunoblot analyses had revealed that the addition of matriglycan-structures on LARGE2 substrate proteins substantially increased their molecular weight (MW). In order to take into account this shift in MW of candidate proteins, glycoprotein-enriched fractions from HT-29 cells with or without ectopic LARGE2 expression were separated by gel electrophoresis and subsequently fractionated in 6 different molecular weight windows (kDa: 0-25, 25-55, 55-75, 75-110, 110-160, 160<). Subsequently, samples were prepared for quantitative mass spectrometry analysis (qLC-MS/MS) analysis according to standard procedures. qLC-MS-MS analysis identified α-DG–related peptides within higher MW protein fractions only when LARGE2 was overexpressed. HT-29 cell secreted Laminin-2 was exclusively detected together with these high MW forms of α-DG, which demonstrated the affinity of Laminin towards the LARGE2-synthesized matriglycan structure on α-DG. Additional candidate proteins identified in this study need further experimental confirmation. Overall, we show that size fractionation after gel electrophoresis followed by quantitative mass spectrometry, performed separately on different MW windows, represents an elegant approach to reveal potential substrates of the O-glycosyltransferase LARGE2.
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Project description:Colorectal cancers have a rare population of cells that express specific cell surface markers, and are referred to as cancer stem cells (CSC). Targeting CSCs, implicated in tumor relapse, is a paradigm shifting approach for colorectal cancer. We used gene microarray to analyze gene expression in HT-29, a colon cancer cell line, grown as monolayer and spheroid and identify metabolic pathways that are upregulated. HT-29 monolayer cells were grown in DMEM/F12 media supplemented with 10% FBS, and 1X Antibiotic-Antimycotic liquid (AA); and spheroids were grown in stem cell media [DMEM:F12, 1X AA, 1X B27, epidermal growth factors, and fibroblast growth factor for five days. Total RNA was isolated using the mirVana™ miRNA Isolation Kit according to the manufacturer's protocol. RNA intergrity was confirmed on the Nanodrop ND-1000 and analyzed with Agilent 2100 bioanalyzer. The arrays were scanned with the Affymetrix 3000 7G plus scanner.
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