title: Effects of bacterial colonization on the porcine intestinal proteome.
abstract: The gastrointestinal tract harbors a complex community of bacteria, of which many may be beneficial. Studies of germ-free animal models have shown that the gastrointestinal microbiota not only assists in making nutrients available for the host but also contributes to intestinal health and development. We studied small intestinal protein expression patterns in gnotobiotic pigs maintained germ-free, or monoassociated with either Lactobacillus fermentum or non-pathogenic Escherichia coli. A common reference design in combination with labeling with stable isobaric tags allowed the individual comparison of 12 animals. Our results showed that bacterial colonization differentially affected mechanisms such as proteolysis, epithelial proliferation, and lipid metabolism, which is in good agreement with previous studies of other germ-free animal models. We have also found that E. coli has a profound effect on actin remodeling and intestinal proliferation, which may be related to stimulated migration and turnover of enterocytes. Regulations related to L. fermentum colonization involved individual markers for immunoregulatory mechanisms.
authors.affiliation: Department of Animal Health, Welfare and Nutrition, Faculty of Agricultural Sciences, University of Aarhus, 8830 Tjele, Denmark.
authors.forename: Marianne
authors.initials: M
authors.lastname: Danielsen
authors.forename: Henrik
authors.initials: H
authors.lastname: Hornshøj
authors.forename: Richard H
authors.initials: RH
authors.lastname: Siggers
authors.forename: Bent Borg
authors.initials: BB
authors.lastname: Jensen
authors.forename: Andrew G
authors.initials: AG
authors.lastname: van Kessel
authors.forename: Emøke
authors.initials: E
authors.lastname: Bendixen
mesh_terms: D000199:Actins / Q000378:metabolism; D000818:Animals; D049109:Cell Proliferation; D004926:Escherichia coli / Q000502:physiology*; D007413:Intestinal Mucosa / Q000378:metabolism*; D007422:Intestines / Q000382:microbiology*; D052197:Limosilactobacillus fermentum / Q000502:physiology*; D011506:Proteins / Q000032:analysis / Q000378:metabolism; D020543:Proteome / Q000032:analysis / Q000378:metabolism*; D034421:Sus scrofa / Q000378:metabolism / Q000382:microbiology
chemical_list: D000199:Actins; D011506:Proteins; D020543:Proteome