title: Mucosa-associated biohydrogenating microbes protect the simulated colon microbiome from stress associated with high concentrations of poly-unsaturated fat.
abstract: Polyunsaturated fatty acids (PUFAs) may affect colon microbiome homeostasis by exerting (specific) antimicrobial effects and/or interfering with mucosal biofilm formation at the gut mucosal interface. We used standardized batch incubations and the Mucosal-Simulator of the Human Microbial Intestinal Ecosystem (M-SHIME) to show the in vitro luminal and mucosal effects of the main PUFA in the Western diet, linoleic acid (LA). High concentrations of LA were found to decrease butyrate production and Faecalibacterium prausnitzii numbers dependent on LA biohydrogenation to vaccenic acid (VA) and stearic acid (SA). In faecal batch incubations, LA biohydrogenation and butyrate production were positively correlated and SA did not inhibit butyrate production. In the M-SHIME, addition of a mucosal environment stimulated biohydrogenation to SA and protected F. prausnitzii from inhibition by LA. This was probably due to the preference of two biohydrogenating genera Roseburia and Pseudobutyrivibrio for the mucosal niche. Co-culture batch incubations using Roseburia hominis and F. prausnitzii validated these observations. Correlations networks further uncovered the central role of Roseburia and Pseudobutyrivibrio in protecting luminal and mucosal SHIME microbiota from LA-induced stress. Our results confirm how cross-shielding interactions provide resilience to the microbiome and demonstrate the importance of biohydrogenating, mucosal bacteria for recovery from LA stress.
authors.affiliation: Center for Microbial Ecology and Technology (CMET), Ghent University, Coupure Links 653, Ghent, BE-9000, Belgium.
authors.forename: Rosemarie
authors.initials: R
authors.lastname: De Weirdt
authors.affiliation: Center for Microbial Ecology and Technology (CMET), Ghent University, Coupure Links 653, Ghent, BE-9000, Belgium.
authors.forename: Emma
authors.initials: E
authors.lastname: Hernandez-Sanabria
authors.affiliation: Laboratory for Animal Nutrition and Product Quality (Lanupro), Ghent University, Proefhoevestraat 10, Melle, BE-9090, Belgium.
authors.forename: Veerle
authors.initials: V
authors.lastname: Fievez
authors.affiliation: Center for Microbial Ecology and Technology (CMET), Ghent University, Coupure Links 653, Ghent, BE-9000, Belgium.
authors.forename: Eva
authors.initials: E
authors.lastname: Mees
authors.affiliation: Center for Microbial Ecology and Technology (CMET), Ghent University, Coupure Links 653, Ghent, BE-9000, Belgium.
authors.forename: Annelies
authors.initials: A
authors.lastname: Geirnaert
authors.affiliation: Center for Microbial Ecology and Technology (CMET), Ghent University, Coupure Links 653, Ghent, BE-9000, Belgium.
authors.forename: Florence
authors.initials: F
authors.lastname: Van Herreweghen
authors.affiliation: Center for Microbial Ecology and Technology (CMET), Ghent University, Coupure Links 653, Ghent, BE-9000, Belgium.
authors.forename: Ramiro
authors.initials: R
authors.lastname: Vilchez-Vargas
authors.affiliation: Center for Microbial Ecology and Technology (CMET), Ghent University, Coupure Links 653, Ghent, BE-9000, Belgium.
authors.forename: Pieter
authors.initials: P
authors.lastname: Van den Abbeele
authors.affiliation: Microbial Interactions and Processes Research Group, Department of Molecular Infection Biology, Helmholtz Centre for Infection Research, Inhoffenstraβe 7, Braunschweig, D-38124, Germany.
authors.forename: Ruy
authors.initials: R
authors.lastname: Jauregui
authors.affiliation: Microbial Interactions and Processes Research Group, Department of Molecular Infection Biology, Helmholtz Centre for Infection Research, Inhoffenstraβe 7, Braunschweig, D-38124, Germany.
authors.forename: Dietmar H
authors.initials: DH
authors.lastname: Pieper
authors.affiliation: Laboratory for Animal Nutrition and Product Quality (Lanupro), Ghent University, Proefhoevestraat 10, Melle, BE-9090, Belgium.
authors.forename: Bruno
authors.initials: B
authors.lastname: Vlaeminck
authors.affiliation: Center for Microbial Ecology and Technology (CMET), Ghent University, Coupure Links 653, Ghent, BE-9000, Belgium.
authors.forename: Tom
authors.initials: T
authors.lastname: Van de Wiele
mesh_terms: D000328:Adult; D001419:Bacteria / Q000145:classification / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism; D002087:Butyrates / Q000378:metabolism; D003106:Colon / Q000382:microbiology* / Q000502:physiology; D005231:Fatty Acids, Unsaturated / Q000378:metabolism*; D005243:Feces / Q000382:microbiology; D005260:Female; D000069196:Gastrointestinal Microbiome; D006801:Humans; D007413:Intestinal Mucosa / Q000382:microbiology*; D019787:Linoleic Acid / Q000378:metabolism; D064307:Microbiota / Q000187:drug effects; D013229:Stearic Acids / Q000378:metabolism; D055815:Young Adult
chemical_list: D002087:Butyrates; D005231:Fatty Acids, Unsaturated; D013229:Stearic Acids; C031183:stearic acid; D019787:Linoleic Acid