The Uptake, Trafficking, and Biodistribution of Bacteroides thetaiotaomicron Generated Outer Membrane Vesicles

Jones, Emily J., Booth, Catherine, Fonseca, Sonia, Parker, Aimee, Cross, Kathryn, Miquel-Clopés, Ariadna, Hautefort, Isabelle, Mayer, Ulrike, Wileman, Tom, Stentz, Régis and Carding, Simon R. (2020) The Uptake, Trafficking, and Biodistribution of Bacteroides thetaiotaomicron Generated Outer Membrane Vesicles. Frontiers in Microbiology, 11. ISSN 1664-302X

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Abstract

Gram-negative bacteria ubiquitously produce and release nano-size, non-replicative outer membrane vesicles (OMVs). In the gastrointestinal (GI-) tract, OMVs generated by members of the intestinal microbiota are believed to contribute to maintaining the intestinal microbial ecosystem and mediating bacteria–host interactions, including the delivery of bacterial effector molecules to host cells to modulate their physiology. Bacterial OMVs have also been found in the bloodstream although their origin and fate are unclear. Here we have investigated the interactions between OMVs produced by the major human gut commensal bacterium, Bacteroides thetaiotaomicron (Bt), with cells of the GI-tract. Using a combination of in vitro culture systems including intestinal epithelial organoids and in vivo imaging we show that intestinal epithelial cells principally acquire Bt OMVs via dynamin-dependent endocytosis followed by intracellular trafficking to LAMP-1 expressing endo-lysosomal vesicles and co-localization with the perinuclear membrane. We observed that Bt OMVs can also transmigrate through epithelial cells via a paracellular route with in vivo imaging demonstrating that within hours of oral administration Bt OMVs can be detected in systemic tissues and in particular, the liver. Our findings raise the intriguing possibility that OMVs may act as a long-distance microbiota–host communication system.

Item Type: Article
Additional Information: Copyright © 2020 Jones, Booth, Fonseca, Parker, Cross, Miquel-Clopés, Hautefort, Mayer, Wileman, Stentz and Carding.
Uncontrolled Keywords: bacterial extracellular vesicles,bacteroides thetaiotaomicron,biodistribution,gi-tract,gut microbiota,microvesicles,organoid monolayer,outer membrane vesicles,cells,bacteria,mechanisms,gut microbiota,virulence,biogenesis,in-vivo,tight,microbiology (medical),microbiology ,/dk/atira/pure/subjectarea/asjc/2700/2726
Faculty \ School: Faculty of Science > School of Biological Sciences
Faculty of Medicine and Health Sciences > Norwich Medical School

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Depositing User: LivePure Connector
Date Deposited: 07 Mar 2020 08:45
Last Modified: 28 May 2020 00:14
URI: https://ueaeprints.uea.ac.uk/id/eprint/74458
DOI: 10.3389/fmicb.2020.00057

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