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Liuu S, Nepelska M, Pfister H, Gamelas Magalhaes J, Chevalier G, Strozzi F, Billerey C, Maresca M, Nicoletti C, Di Pasquale E, Pechard C, Bardouillet L, Girardin SE, Boneca IG, Doré J, Blottière HM, Bonny C, Chene L, Cultrone A. Identification of a muropeptide precursor transporter from gut microbiota and its role in preventing intestinal inflammation. Proc Natl Acad Sci U S A 2023; 120:e2306863120. [PMID: 38127978 PMCID: PMC10756304 DOI: 10.1073/pnas.2306863120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Accepted: 10/31/2023] [Indexed: 12/23/2023] Open
Abstract
The gut microbiota is a considerable source of biologically active compounds that can promote intestinal homeostasis and improve immune responses. Here, we used large expression libraries of cloned metagenomic DNA to identify compounds able to sustain an anti-inflammatory reaction on host cells. Starting with a screen for NF-κB activation, we have identified overlapping clones harbouring a heterodimeric ATP-binding cassette (ABC)-transporter from a Firmicutes. Extensive purification of the clone's supernatant demonstrates that the ABC-transporter allows for the efficient extracellular accumulation of three muropeptide precursor, with anti-inflammatory properties. They induce IL-10 secretion from human monocyte-derived dendritic cells and proved effective in reducing AIEC LF82 epithelial damage and IL-8 secretion in human intestinal resections. In addition, treatment with supernatants containing the muropeptide precursor reduces body weight loss and improves histological parameters in Dextran Sulfate Sodium (DSS)-treated mice. Until now, the source of peptidoglycan fragments was shown to come from the natural turnover of the peptidoglycan layer by endogenous peptidoglycan hydrolases. This is a report showing an ABC-transporter as a natural source of secreted muropeptide precursor and as an indirect player in epithelial barrier strengthening. The mechanism described here might represent an important component of the host immune homeostasis.
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Affiliation(s)
| | - Malgorzata Nepelska
- Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), AgroParisTech, Food Microbial Ecology lab (Micalis), Université Paris-Saclay, Jouy-en-Josas78350, France
| | | | | | | | | | | | - Marc Maresca
- CNRS, Centrale Marseille, Institut des Sciences Moléculaires (iSm2) UMR7313, Aix Marseille Université, Marseille13013, France
| | - Cendrine Nicoletti
- CNRS, Centrale Marseille, Institut des Sciences Moléculaires (iSm2) UMR7313, Aix Marseille Université, Marseille13013, France
| | - Eric Di Pasquale
- Institut de NeuroPhysioPathologie (INP), Aix Marseille Université, UMR 7051, Marseille13005, France
| | | | | | - Stephen E. Girardin
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON M5S 1A8, Canada
| | - Ivo Gomperts Boneca
- Institut Pasteur, Université Paris Cité, CNRS Unité Mixe de Recherche 6047, INSERM U1306, Unité de Biologie et génétique de la paroi bactérienne, Paris75015, France
| | - Joel Doré
- Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), AgroParisTech, Food Microbial Ecology lab (Micalis), Université Paris-Saclay, Jouy-en-Josas78350, France
- Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), MetaGenoPolis, Université Paris-Saclay, Jouy-en-Josas78350, France
| | - Hervé M. Blottière
- Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), AgroParisTech, Food Microbial Ecology lab (Micalis), Université Paris-Saclay, Jouy-en-Josas78350, France
- Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), MetaGenoPolis, Université Paris-Saclay, Jouy-en-Josas78350, France
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