It is interesting to note that the expression of the otherCEACAMsgenes on the transgene, and in the genome, did not show any modification of their expression in response to the MS diet, suggesting methylation-independent regulation mechanisms for these genes. deficient CD patients. Subject terms:Crohn’s disease, Cellular microbiology, Preclinical research, Bacterial infection == Introduction == Crohns Disease (CD), an Inflammatory Bowel Disease (IBD), is a chronic inflammatory disorder of the gastrointestinal tract, affecting 2 million people in Europe with a rising incidence in newly industrialized countries1. Its etiology involves environmental factors, like the western lifestyle, genetic and microbial factors, leading to abnormal immune response of intestinal mucosa2,3. Recently, studies have highlighted XL413 alteration of XL413 DNA methylation in CD patients, which could be one of the missing links between intestinal inflammatory phenotype in CD patients and environmental factors. During the last decade, specific attention was given to the study of DNA methylation in IBD patients blood cells and intestinal epithelial cells, all showing differentially methylated CpG sites in CD patients, when compared to controls413. DNA methylation occurs within the one-carbon metabolism pathway and is dependent on several enzymes (dihydrofolate reductase, methylene-tetrahydrofolate reductase, methionine synthase) and on the availability of micronutrients used as cofactors such as folate (B9 vitamin), B12 vitamin (methionine synthase cofactor), methionine, choline and betaine. Folate enters the one-carbon metabolism cycle where it is converted, as a result of many enzymatic reactions, into S-adenosyl-methionine used as a methyl-donor by DNA Rabbit Polyclonal to GJC3 Methyltransferase (DNMT) enzymes to catalyze the DNA methylation reaction14. The level of folate and other methyl-donor molecules intake through the diet were associated to the regulation of DNA methylation. Even more significantly, serum B12 and folate (B9) deficiencies have frequently been noticed in different cohorts of IBD patients1420. Based on the known roles of these molecules in one-carbon rate of metabolism, epigenetic modifications such as DNA methylation profiles and revised genes expression observed in CD individuals could be the result, in part, of methyl-donor molecules deficiencies. A high prevalence of invasiveEscherichia colistrains (2163% of CD individuals), designated as the pathotype Adherent-InvasiveE. coli(AIEC), has been recognized in the ileal mucosa of CD XL413 individuals in many studies worldwide2126. These bacteria induce secretion of pro-inflammatory cytokines and XL413 intestinal swelling inside a genetically vulnerable mouse model27. AIEC can abide by and invade intestinal epithelial cells (IECs), through the connection with the abnormally over-expressed mannosylated CEACAM6 protein in IECs of CD individuals28,29. We used the CEABAC10 mouse model to study AIEC intestinal colonization in vivo. This transgenic mouse model bears 4 human being CEACAMs genes (CEACAM3, CEACAM5, CEACAM6andCEACAM7) under the control of their human being promoter. As previously explained by our group, AIEC bacteria highly colonize the gut mucosa of these mice in comparison to WT mice, showing that this mouse model is appropriate to mimic AIEC colonization in CD27,30. We previously highlighted a DNA methylation-dependent rules ofCEACAM6gene transcription. Methylation of a specific CpG within theCEACAM6gene promoter impairs HIF-1 transcription element binding, controlling the transcription of the gene31. As CD individuals regularly present problems in methyl-donor molecules and in DNA methylation pattern, one strategy to limit AIEC colonization could be to restore the methylation pattern ofCEACAM6(and additional misregulated genes) to decrease its manifestation through diet-based strategy by increasing intake in methyl-donor molecules. Our hypothesis is definitely that methyl-donor supplementation, such as folate and B12 vitamin could modulate gene manifestation in IECs, decreaseCEACAM6gene manifestation and, consequently, prevent AIEC colonization and subsequent inflammation. Methyl-donor enriched or deficient diet programs have been used in many study contexts. These studies possess genuinely shown that maternal-methyl-donor supplementation raises DNA methylation in XL413 the offspring and level of sensitivity of mice to DSS-induced colitis3235. In contrast, methyl-donor deficiency prospects to a decrease in DNA methylation.