Project description:We used microarrays to investigate gene expression changes in human colon normal fibroblasts exposed to a bitter orange extract enriched in flavanones (and previously subjected to in vitro gastro-duodenal digestion) to determine possible modulatory beneficial effects induced by these plant-derived compounds on the colon cells. Experiment Overall Design: We used ~90% confluent monolayers of colon CCD-18Co cells exposed to either small doses of pre-digested extract from bitter orange containing a mixture of flavanones (Treated) or equivalent quantities of digestive enzymes and salts (Control). Treatments were done in triplicate.
Project description:Purpouse: To compare the transriptome of CCD-18Co human colon fibroblasts treated with vehicle or Wnt3A. Methods: We treated triplicate plates of CCD-18Co cells with vehicle or Wnt3A during 24 h. Afterwards, we obtained total RNA and used it in RNA-seq experiments. Results: Our analysis rendered a total of 1136 differentially expressed genes (FDR<0.05), of which 662 were up-regulated and 474 were downregulated in response to Wnt3A. Conclusions: Wnt3A regulates a wide set of genes in CCD-18Co human colon fibroblasts
Project description:We used microarrays to investigate gene expression changes in human colon normal fibroblasts exposed to a bitter orange extract enriched in flavanones (and previously subjected to in vitro gastro-duodenal digestion) to determine possible modulatory beneficial effects induced by these plant-derived compounds on the colon cells. Keywords: Comparative gene expression, Control vs Treated cells (response to exposure with xenobiotics plant polyphenols)
Project description:Canonical Hedgehog (Hh) signaling regulates the expression of genes that are critical to the patterning and development of a variety of organ systems. In adult, both ligand-dependent and ligand-independent Hh pathway activation are known to promote tumorigenesis. Recent studies have shown that in tumors promoted by Hh ligand, activation occurs within the stromal microenvironment (Yauch et al., 2009). In situ hybridization of the pathway target gene, Ptch1, shows that signaling is located at stromal perivascular fibroblast-like cells in xenograft tumor sections derived from Hh-expressing colorectal cancer cell lines. To study the downstream genes regulated by Hh signaling, we treated a primary human colon myofibroblast, CCD-18Co, with SHH (1 ug/ml) or no treatment (control) in serum-free medium supplemented with 0.1% BSA for 72 hrs and performed microarray analysis (Affymetrix U133P) on these samples. Three biological replicates of SHH stimulated and three replicates of unstimulated primary colon myofibroblast cells CCD-18Co were used in the experiment to analyze their gene expression.
Project description:The Wnt/b-catenin signalling pathway is essential for intestinal epithelium homeostasis, but its aberrant activation is a hallmark of colorectal cancer (CRC). Several studies indicate that the bioactive vitamin D metabolite 1a,25-dihydroxyvitamin D3 (1,25(OH)2D3) inhibits proliferation and promotes epithelial differentiation of colon carcinoma cells in part through antagonism of the Wnt/b-catenin pathway. It is now accepted that stromal fibroblasts are crucial in healthy and pathologic intestine: pericryptal myofibroblasts are constituents of the stem cell niche and cancer-associated fibroblasts (CAFs) contribute to CRC progression. However, studies on the combined action of 1,25(OH)2D3 and Wnt factors in colon fibroblasts are lacking. Here we show by global transcriptomic studies that 1,25(OH)2D3 and Wnt3A have profound, additive, partially overlapping effects on the gene expression profile of CCD-18Co human colon myofibroblasts. Moreover, 1,25(OH)2D3 and Wnt3A inhibit CCD-18Co cell proliferation and migration, while 1,25(OH)2D3 reduces, but Wnt3A increases, their capacity to contract collagen gels (a marker of fibroblast activation). These data were largely confirmed in patient-derived primary colon normal fibroblasts and CAFs, and in fibroblasts from other origins. Our results indicate that 1,25(OH)2D3 and Wnt3A are strong regulators of colon fibroblast biology and contribute to a better knowledge of intestinal homeostasis and stromal fibroblast action in CRC.
Project description:Differential methylation between human normal fibroblast cell CCD-18Co transfected with P16-Dnmt or pTRIPZ control vector was identified using Illumina HumanMethylation 850K array. The genome-wide methylation detection experiment was carried out by CapitalBio Technology Company.
Project description:Canonical Hedgehog (Hh) signaling regulates the expression of genes that are critical to the patterning and development of a variety of organ systems. In adult, both ligand-dependent and ligand-independent Hh pathway activation are known to promote tumorigenesis. Recent studies have shown that in tumors promoted by Hh ligand, activation occurs within the stromal microenvironment (Yauch et al., 2009). In situ hybridization of the pathway target gene, Ptch1, shows that signaling is located at stromal perivascular fibroblast-like cells in xenograft tumor sections derived from Hh-expressing colorectal cancer cell lines. To study the downstream genes regulated by Hh signaling, we treated a primary human colon myofibroblast, CCD-18Co, with SHH (1 ug/ml) or no treatment (control) in serum-free medium supplemented with 0.1% BSA for 72 hrs and performed microarray analysis (Affymetrix U133P) on these samples.