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Exploiting the Zonulin Mouse Model to Establish the Role of Primary Impaired Gut Barrier Function on Microbiota Composition and Immune Profiles

The balanced interplay between epithelial barrier, immune system, and microbiota maintains gut homeostasis, while disruption of this interplay may lead to inflammation. Paracellular permeability is governed by intercellular tight-junctions (TJs). Zonulin is, to date, the only known physiological reg...

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Published in:Frontiers in immunology 2019-09, Vol.10, p.2233-2233
Main Authors: Miranda-Ribera, Alba, Ennamorati, Maria, Serena, Gloria, Cetinbas, Murat, Lan, Jinggang, Sadreyev, Ruslan I, Jain, Nitya, Fasano, Alessio, Fiorentino, Maria
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container_title Frontiers in immunology
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creator Miranda-Ribera, Alba
Ennamorati, Maria
Serena, Gloria
Cetinbas, Murat
Lan, Jinggang
Sadreyev, Ruslan I
Jain, Nitya
Fasano, Alessio
Fiorentino, Maria
description The balanced interplay between epithelial barrier, immune system, and microbiota maintains gut homeostasis, while disruption of this interplay may lead to inflammation. Paracellular permeability is governed by intercellular tight-junctions (TJs). Zonulin is, to date, the only known physiological regulator of intestinal TJs. We used a zonulin transgenic mouse (Ztm) model characterized by increased small intestinal permeability to elucidate the role of a primary impaired gut barrier on microbiome composition and/or immune profile. Ztm exhibit an altered gene expression profile of TJs in the gut compared to wild-type mice (WT): Claudin-15, Claudin-5, Jam-3, and Myosin-1C are decreased in the male duodenum whereas Claudin-15, Claudin-7, and ZO-2 are reduced in the female colon. These results are compatible with loss of gut barrier function and are paralleled by an altered microbiota composition with reduced abundance of the genus , known to have positive effects on gut barrier integrity and strengthening, and an increased abundance of the genus, associated to low-grade inflammatory conditions. Immune profile analysis shows a subtly skewed distribution of immune cell subsets toward a pro-inflammatory phenotype with more IL-17 producing adaptive and innate-like T cells in Ztm. Interestingly, microbiota "normalization" involving the transfer of WT microbiota into Ztm, did not rescue the altered immune profile. Our data suggest that a primary impaired gut barrier causing an uncontrolled trafficking of microbial products leads to a latent pro-inflammatory status, with a skewed microbiota composition and immune profile that, in the presence of an environmental trigger, as we have previously described (1), might promote the onset of overt inflammation and an increased risk of chronic disease.
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subjects dysbiosis
gut permeability
Immunology
microbial products trafficking
microbiota
tight-junctions
zonulin transgenic mouse
title Exploiting the Zonulin Mouse Model to Establish the Role of Primary Impaired Gut Barrier Function on Microbiota Composition and Immune Profiles
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