title: Colorectal Cancer-Associated Fibroblasts are Genotypically Distinct.
abstract: Cells in the stromal microenvironment facilitate colorectal cancer (CRC) progression and "co-evolve" with the epithelial cancer cells. Genetic and epigenetic differences between normal colorectal mucosa fibroblasts (NF) and carcinoma-associated fibroblasts (CAF) are not known. The aim of this study is to identify differentially expressed genes and promoter methylation between NF and CAF in human CRC. RNA and DNA were extracted from cultured NF and CAF from CRC resections. Genome-wide gene expression and methylation analyses were performed using the Illumina Human HT-12 v4.0 Expression and Illumina Human Methylation 27 BeadChips. Gene expression values between NF and CAF were compared and correlated with methylation patterns. Data was analyzed using Partek Genomics Suite using one-way ANOVA and p<0.05 as significant. Ingenuity iReport™ was performed to identify potential differences in biological functions and pathways between the NF and CAF. Paired methylation and gene expression analyses from 11 NF and 10 CAF colorectal samples are reported. Unsupervised analysis of differentially expressed genes using iReport™ identified "Top Diseases" as "Cancer" and "Colorectal Cancer". Previous genome wide studies have focused on the cancer cells. We have identified differentially expressed genes and differentially methylated promoter regions that are CAF-specific in CRC.
authors.affiliation: Department of Surgery, University of Texas Medical Branch, Galveston, TX, 77555 USA.
authors.forename: Amy A
authors.initials: AA
authors.lastname: Mrazek
authors.affiliation: Department of Biochemistry and Molecular Biology, University of Texas Medical Branch, Galveston, TX, 77555 USA.
authors.forename: Joseph R
authors.initials: JR
authors.lastname: Carmical
authors.affiliation: Department of Biochemistry and Molecular Biology, University of Texas Medical Branch, Galveston, TX, 77555 USA.
authors.forename: Thomas G
authors.initials: TG
authors.lastname: Wood
authors.affiliation: Department of Surgery, University of Texas Medical Branch, Galveston, TX, 77555 USA.
authors.forename: Mark R
authors.initials: MR
authors.lastname: Hellmich
authors.affiliation: Department of Surgical Pathology, University of Texas Medical Branch, Galveston, TX, 77555 USA.
authors.forename: Mahmoud
authors.initials: M
authors.lastname: Eltorky
authors.affiliation: Department of Surgery, University of Texas Medical Branch, Galveston, TX, 77555 USA.
authors.forename: Frederick J
authors.initials: FJ
authors.lastname: Bohanon
authors.affiliation: Department of Surgery, University of Texas Medical Branch, Galveston, TX, 77555 USA.
authors.forename: Celia
authors.initials: C
authors.lastname: Chao
keywords: carcinoma-associated fibroblasts; colorectal cancer; gene expression; microarray; normal fibroblasts; promoter methylation