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TSG-6 supports fistulizing Crohn’s disease by a mechanoregulated activation of the epithelial-to-mesenchymal transition

ABSTRACT: BACKGROUND AND AIMS: Perianal fistula represents one of the most important complications in Crohn’s Disease (CD). Epithelial-to-mesenchymal transition (EMT) has been demonstrated to play a major role in the pathogenesis, however the mechanisms driving EMT need to be clarified. Significant alterations in the tissue structural composition occur in the fistula, but how these changes promote EMT was not addressed. We aim to explore the relevance of TSG-6, a stabilizer of extracellular matrix, in the fistula pathogenesis. METHODS: Intestinal surgical specimens from perianal fistula tissue and surrounding region of fistulizing CD were analyzed histologically and by RNA sequencing (RNA-seq). Significantly modulated genes and TSG-6 expression were validated by RT-PCR, WB and immunofluorescence assays [N=20]. TSG-6 expression was reconstituted in Caco-2 cell line and primary perifistula-derived fibroblasts, and proliferative and migratory assays were performed. RESULTS: A marked different organization of extracellular matrix was found across fistula and perifistula regions with an increased expression of integrins, hyaluronan synthases, TSG-6 and MMPs in the fistula. TSG-6 overexpression in Caco-2 cells reduced proliferation, promoted the EMT transcription factor SNAIL, and, in co-stimulation with TGFβ1, migration. The acquisition of TSG-6 increased SNAI1 and hyaluronan synthases levels, and led to activated phenotype of perifistula-derived fibroblasts. Positive Pearson correlation was observed between TSG-6 expression and mechanosensitive proteins in fistula tissue. CONCLUSIONS: By mediating changes in the extracellular matrix organization, TSG-6 triggers the EMT transcription factor SNAIL through the activation of mechanosensitive proteins. These data point to TSG-6 as a new potential target for the treatment of perianal fistula.

ORGANISM(S): Homo sapiens

PROVIDER: GSE157020 | GEO | 2023/01/04

REPOSITORIES: GEO

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Project description:Background: CrohnM-bM-^@M-^Ys disease is presently an incurable inflammatory bowel disease. Fistulae are extensions of the intestinal tract that may form connections with other organs. These are a common complication of CrohnM-bM-^@M-^Ys disease affecting up to 50% of patients with the most common including perianal and rectovaginal fistulae. The dysregulated growth observed in fistulae shares several major characteristics seen in the development of tumours. These similarities include epithelial-to-mesenchymal transition (EMT), invasive cell growth, increased extracellular matrix production and remodelling, up-regulated local expression of growth factors such as IGF-1 and the down-regulation of apoptosis pathways. Although several susceptibility loci have been described within CrohnM-bM-^@M-^Ys disease there is no individual gene or mutation that identifies susceptibility or the subsequent formation of fistulae within all people. Copy-number variation (CNV) is one mechanism that may explain much of this genetic complexity. CNV may be caused by a variety of mechanisms such as cycles of chromosomal breakage/fusion/bridging that are typical within chronically inflamed tissue. Interestingly CNV shows locus-specific mutation rates between individuals higher than that of SNPs and has been associated with complex Mendelian traits including disease susceptibility. In this current study we performed array comparative genomic hybridisation (aCGH) analysis of active fistulae resected from patients as part of a previous surgical intervention. As the control for comparison we employed tissue taken from the same patient within the same surgery at an uninvolved site of the gastrointestinal tract. This matched control was employed to better investigate CNV specific to the fistula tissue of each individual avoiding complications associated with the large number of CNV present within the healthy population. Major question addressed by the work: What are the differences in genetic copy-number within localised intestinal fistula tissue of individuals with CrohnM-bM-^@M-^Ys disease compared to healthy intestinal tissue from the same individual? Samples were selected from patients presenting with CrohnM-bM-^@M-^Ys Disease fistulae at Eastern Health Department of Gastroenterology and Hepatology (Arnold Street, Box Hill, Victoria, Australia). The 8 samples used in this study were formalin-fixed paraffin-embedded (FFPE) specimens following a surgical intervention to remove fistula tissue. To focus on changes within the individual patient we used tissue taken from the same surgery at an uninvolved region of the intestine as the matched control for CNV analysis.

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TSG-6 supports fistulizing Crohn’s disease by a mechanoregulated activation of the epithelial-to-mesenchymal transition

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